WO2018071500A1 - Anti-lag-3 antibodies and methods of use thereof - Google Patents

Anti-lag-3 antibodies and methods of use thereof Download PDF

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Publication number
WO2018071500A1
WO2018071500A1 PCT/US2017/056078 US2017056078W WO2018071500A1 WO 2018071500 A1 WO2018071500 A1 WO 2018071500A1 US 2017056078 W US2017056078 W US 2017056078W WO 2018071500 A1 WO2018071500 A1 WO 2018071500A1
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Prior art keywords
amino acid
seq
antibody
acid sequence
isolated antibody
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PCT/US2017/056078
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English (en)
French (fr)
Inventor
Nicholas Stuart Wilson
David Adam Savitsky
Shawn Michael JENNINGS
Marc VAN DIJK
Cornelia Anne Mundt
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Agenus Inc
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Agenus Inc
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Priority to JP2019519724A priority Critical patent/JP7066696B2/ja
Priority to IL302808A priority patent/IL302808B2/en
Priority to CN202311544135.XA priority patent/CN117586403A/zh
Priority to EP17794131.7A priority patent/EP3526256B1/en
Priority to CA3037380A priority patent/CA3037380A1/en
Priority to KR1020197012657A priority patent/KR102576042B1/ko
Priority to CN201780072250.8A priority patent/CN110023337B/zh
Priority to EA201990927A priority patent/EA201990927A1/ru
Priority to IL265800A priority patent/IL265800B2/en
Priority to IL320174A priority patent/IL320174A/en
Priority to KR1020237030065A priority patent/KR20230133934A/ko
Priority to NZ751913A priority patent/NZ751913B2/en
Application filed by Agenus Inc filed Critical Agenus Inc
Priority to BR112019007369-8A priority patent/BR112019007369A2/pt
Priority to AU2017343621A priority patent/AU2017343621B2/en
Priority to MX2019003683A priority patent/MX2019003683A/es
Publication of WO2018071500A1 publication Critical patent/WO2018071500A1/en
Priority to PH12019500709A priority patent/PH12019500709A1/en
Anticipated expiration legal-status Critical
Priority to AU2021282381A priority patent/AU2021282381B2/en
Priority to JP2022073371A priority patent/JP7369233B2/ja
Priority to JP2023176804A priority patent/JP7674432B2/ja
Priority to JP2025069540A priority patent/JP2025124084A/ja
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2803—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the immunoglobulin superfamily
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    • A61K39/395—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum
    • A61K39/39533—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum against materials from animals
    • A61K39/3955—Antibodies; Immunoglobulins; Immune serum, e.g. antilymphocytic serum against materials from animals against proteinaceous materials, e.g. enzymes, hormones, lymphokines
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K45/00—Medicinal preparations containing active ingredients not provided for in groups A61K31/00 - A61K41/00
    • A61K45/06—Mixtures of active ingredients without chemical characterisation, e.g. antiphlogistics and cardiaca
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
    • A61K47/6849—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting a receptor, a cell surface antigen or a cell surface determinant
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
    • A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
    • A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
    • A61K47/6873—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site the antibody targeting an immunoglobulin; the antibody being an anti-idiotypic antibody
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K39/00—Medicinal preparations containing antigens or antibodies
    • A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
    • A61K2039/507—Comprising a combination of two or more separate antibodies
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K2300/00—Mixtures or combinations of active ingredients, wherein at least one active ingredient is fully defined in groups A61K31/00 - A61K41/00
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
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    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
    • C07K2317/24—Immunoglobulins specific features characterized by taxonomic origin containing regions, domains or residues from different species, e.g. chimeric, humanized or veneered
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
    • C07K2317/33—Crossreactivity, e.g. for species or epitope, or lack of said crossreactivity
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
    • C07K2317/34—Identification of a linear epitope shorter than 20 amino acid residues or of a conformational epitope defined by amino acid residues
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/52—Constant or Fc region; Isotype
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/55—Fab or Fab'
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
    • C07K2317/565—Complementarity determining region [CDR]
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
    • C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
    • C07K2317/567—Framework region [FR]
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/70—Immunoglobulins specific features characterized by effect upon binding to a cell or to an antigen
    • C07K2317/76—Antagonist effect on antigen, e.g. neutralization or inhibition of binding

Definitions

  • the instant disclosure relates to antibodies that specifically bind to LAG-3 (e.g. , human LAG-3) and methods of using the same.
  • LAG-3 e.g. , human LAG-3
  • Lymphocyte activation gene 3 also known as CD223, is a type I membrane protein in the immunoglobulin (Ig) superfamily that is composed of four extracellular Ig domains and a cytoplasmic domain containing a conserved repeated EP motif and a single conserved KIEELE motif (Triebel et al, (1990) J Exp Med, 171 : 1393-405; Workman et al, (2002) J Immunol, 169: 5392-5).
  • LAG-3 is expressed on activated effector T lymphocytes (Teff), activated regulatory T lymphocytes (Treg), activated B lymphocytes, a subset of resting natural killer (NK) cells, and resting plasmacytoid dendritic cells (PDC) (Huang et al, (2004) Immunity, 21 : 503- 13; Workman et al, (2009) J Immunol, 182: 1885- 91; Kisielow et al, (2005) Eur J Immunol, 35: 2081-8; Baixeras et al, (1992) J Exp Med, 176: 327-37; Workman et al, (2002) Eur J Immunol, 32: 2255-63).
  • TME tumor microenvironment
  • LAG-3 expression is sustained on T regulatory type 1 cells (Trl) and so-called exhausted antigen-specific T cells (Park et al, (2012) Cell Immunol, 278: 76- 83; Gagliani et al, (2013) Nat Med, 19: 739-46; Blackburn et al, (2009) Nat Immunol, 10: 29-37).
  • LAG-3 functions to negatively regulate activated T cells.
  • the ligand for LAG-3 is MHC class II, expressed on antigen presenting cells (APC) and activated T cells (Roche and Furuta (2015) Nat Rev Immunol, 15: 203-16).
  • APC antigen presenting cells
  • the interaction between LAG-3 and its ligand inhibits proliferation and cytokine secretion of CD4+ and CD8+ Teff cells (Macon-Lemaitre and Triebel (2005) Immunology, 115: 170-8; Huard et al, (1997) Proc Natl Acad Sci U S A, 94: 5744-9).
  • LAG-3 in Tregs and PDCs contributes to the negative regulation of T cell function (Huang et al, (2004) Immunity, 21 : 503- 13; Workman et al, (2009) J Immunol, 182: 1885-91). Consistent with its role in maintaining immune homeostasis, LAG-3 deficiency induced lethal myocarditis in mice also genetically deficient in PD-1 (Okazaki et ah, (2011) J Exp Med, 208: 395-407).
  • the instant disclosure provides antibodies that specifically bind to LAG-3 (e.g. , human LAG-3) and antagonize LAG-3 function, e.g., LAG-3-mediated immune suppression.
  • pharmaceutical compositions comprising these antibodies, nucleic acids encoding these antibodies, expression vectors and host cells for making these antibodies, and methods of treating a subject using these antibodies.
  • the antibodies disclosed herein are particularly useful for increasing T cell activation in response to an antigen (e.g., a tumor antigen or an infectious disease antigen) and/or decreasing Treg-mediated immune suppression, and hence for treating cancer in a subject or treating or preventing an infectious disease in a subject.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain variable region comprising complementarity determining regions CDRH 1, CDRH2 and CDRH3 and a light chain variable region comprising complementarity determining regions CDRLl, CDRL2 and CDRL3, wherein:
  • CDRH 1 comprises the amino acid sequence of DXiYX 2 X 3 (SEQ ID NO: 140), wherein X 2 is I or M, and
  • X 3 is H, Y or D
  • CDRH2 comprises the amino acid sequence of X iIDP ANX2X3X4X5X6X7PX8X9QX 10 (SEQ ID NO: 142), wherein
  • X 2 is D or G
  • X 3 is N or H
  • X 4 is T or S
  • X 5 is K or H
  • X6 is Y or F
  • X 7 is D or A
  • Xs is K or R
  • CDRH3 comprises the amino acid sequence of YX 1 X 2 X 3 YX 4 VGGX 5 DY (SEQ ID NO: 144), wherein
  • X 2 is Y or D
  • X 3 is K or R
  • CDRLl comprises the amino acid sequence of SVSSX1ISSSX2LX3 (SEQ ID NO:
  • X 3 is H or Y
  • CDRL2 comprises the amino acid sequence of GTSNLAS (SEQ ID NO: 104);
  • CDRL3 comprises the amino acid sequence of QQWXiX 2 YPX 3 T (SEQ ID NO: 149), wherein
  • X 3 is F, L, H, or W.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain variable region comprising complementarity determining regions CDRHl, CDRH2 and CDRH3 and a light chain variable region comprising complementarity determining regions CDRLl, CDRL2 and CDRL3, wherein:
  • CDRH l comprises the amino acid sequence of DXiYX 2 X 3 (SEQ ID NO: 140), wherein
  • X 3 is H, Y or D
  • CDRH2 comprises the amino acid sequence of
  • X 3 is N or H
  • X 5 is K or H
  • X 7 is D or A
  • CDRH3 comprises the amino acid sequence of YX 1 X 2 X3YX 4 VGGX5DY (SEQ ID NO: 144), wherein
  • X 2 is Y or D
  • X 3 is K or R
  • CDRL 1 comprises the amino acid sequence of SVSSX 1 ISSSX 2 LX 3 (SEQ ID NO:
  • X 3 is H or Y
  • CDRL2 comprises the amino acid sequence of GTSNLAS (SEQ ID NO: 104);
  • CDRL3 comprises the amino acid sequence of QQWX 1 X 2 YPX3T (SEQ ID NO: 149), wherein
  • X 3 is F, L, H, or W.
  • CDRH 1 comprises the amino acid sequence of DX 1 YX 2 X 3 (SEQ ID NO: 141), wherein: Xj is T or N; X 2 is I or M; and X 3 is H or Y.
  • CDRH2 comprises the amino acid sequence of X 1 IDPANX 2 X3X 4 KX5X6PX7FQX8 (SEQ ID NO: 143), wherein: Xj is E, R, or S; X 2 is D or G; X3 is N or H; X4 is T or S; X5 is Y or F; Xe is D or A; X7 is K or R; and Xs is G or D.
  • CDRH3 comprises the amino acid sequence of YX 1 X 2 X 3 YDVGGX 4 DY (SEQ ID NO: 145), wherein: Xi is Y, F, or S; X 2 is Y or D; X 3 is K or R; and X 4 is F or C.
  • CDRH3 comprises the amino acid sequence of YYYX 1 YX 2 VGGFDY (SEQ ID NO: 146), wherein: Xj is K or R; and X 2 is D or E.
  • CDRL1 comprises the amino acid sequence of SVSSSISSSNLXi (SEQ ID NO: 148), wherein: Xi is H or Y.
  • CDRL3 comprises the amino acid sequence of QQWXiSYPX 2 T (SEQ ID NO: 150), wherein: Xj is S, N, or R; and X 2 is F, L, or H.
  • CDRH1 comprises the amino acid sequence of DTYIH (SEQ ID NO: 79);
  • CDRH2 comprises the amino acid sequence of EIDPANDNTKYDPKFQG (SEQ ID NO:
  • CDRH3 comprises the amino acid sequence of YYYX1YX2VGGFDY (SEQ ID NO:
  • CDRL1 comprises the amino acid sequence of SVSSSISSSNLH (SEQ ID NO: 100);
  • CDRL2 comprises the amino acid sequence of GTSNLAS (SEQ ID NO: 104);
  • CDRL3 comprises the amino acid sequence of QQWSSYPFT (SEQ ID NO: 105).
  • CDRHl, CDRH2, and CDRH3 comprise the amino acid sequences set forth in SEQ ID NOs: 79, 90, and 98, respectively.
  • the heavy chain variable region comprises an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, 97%, 98%, or 99% identical to the amino acid sequence of SEQ ID NO: 65 or 220.
  • the heavy chain variable region comprises an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 65 or 220.
  • the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 220.
  • the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 65. In certain embodiments, the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 220. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 226. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 169.
  • CDRL1, CDRL2, and CDRL3 comprise the amino acid sequences set forth in SEQ ID NOs: 100, 104, and 105, respectively.
  • the light chain variable region comprises an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, 97%, 98%, or 99% identical to the amino acid sequence of SEQ ID NO: 73 or 221.
  • the light chain variable region comprises an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 73 or 221.
  • the light chain variable region comprises the amino acid sequence of SEQ ID NO: 221.
  • the light chain variable region comprises the amino acid sequence of SEQ ID NO: 73.
  • the antibody comprises a light chain comprising the amino acid sequence of SEQ ID NO: 228.
  • the antibody comprises a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • CDRH 1 comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 78-82.
  • CDRH2 comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 83-93.
  • CDRH3 comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 94-99.
  • CDRL1 comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 100- 103.
  • CDRL3 comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 105-112.
  • CDRHl, CDRH2 and CDRH3 comprise the CDRH l, CDRH2 and CDRH3 amino acid sequences, respectively, set forth in SEQ ID NOs: 78, 83, and 94; 78, 85, and 95; 78, 86, and 96; 78, 86, and 97; 78, 91, and 94; 78, 92, and 96; 79, 84, and 95; 79, 88, and 95; 79, 89, and 95; 79, 90, and 95; 79, 90, and 98; 79, 90, and 99; 80, 85, and 96; 81, 87, and 96; or, 82, 93, and 95.
  • CDRLl, CDRL2 and CDRL3 comprise the CDRL1, CDRL2 and CDRL3 amino acid sequences, respectively, set forth in SEQ ID NOs: 100, 104, and 105; 100, 104, and 106; 100, 104, and 107; 100, 104, and 109; 100, 104, and 110; 101, 104, and 108; 102, 104, and 105; 102, 104, and 112; or, 103, 104, and 111.
  • CDRHl, CDRH2, CDRH3, CDRLl, CDRL2, and CDRL3 comprise the amino acid sequences set forth in SEQ ID NOs: 78, 83, 94, 100, 104, and 105; 78, 85, 95, 100, 104, and 105; 78, 86, 96, 100, 104, and 105; 78, 86, 96, 100, 104, and 109; 78, 86, 96, 100, 104, and 110; 78, 86, 96, 101, 104, and 108; 78, 86, 96, 103, 104, and 111; 78, 86, 97, 102, 104, and 112; 78, 91, 94, 100, 104, and 107; 78, 92, 96, 100, 104, and 105; 78, 92, 96, 100, 104, and 109; 79, 84, 95, 100,
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain variable region comprising complementarity determining regions CDRHl, CDRH2 and CDRH3, and a light chain variable region comprising complementarity determining regions CDRLl, CDRL2 and CDRL3, wherein CDRHl, CDRH2, CDRH3, CDRLl, CDRL2, and CDRL3 comprise the amino acid sequences set forth in SEQ ID NOs: 79, 90, 95, 100, 104, and 105, respectively.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, comprising a heavy chain variable region comprising complementarity determining regions CDRHl, CDRH2 and CDRH3, and a light chain variable region comprising complementarity determining regions CDRLl, CDRL2 and CDRL3, wherein CDRHl, CDRH2, CDRH3, CDRLl, CDRL2, and CDRL3 comprise the amino acid sequences set forth in SEQ ID NOs: 79, 90, 95, 100, 104, and 105, respectively.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain variable region comprising complementarity determining regions CDRHl, CDRH2 and CDRH3, and a light chain variable region comprising complementarity determining regions CDRLl, CDRL2 and CDRL3, wherein CDRHl, CDRH2, CDRH3, CDRLl, CDRL2, and CDRL3 comprise the amino acid sequences set forth in SEQ ID NOs: 79, 90, 98, 100, 104, and 105, respectively.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, comprising a heavy chain variable region comprising complementarity determining regions CDRHl, CDRH2 and CDRH3, and a light chain variable region comprising complementarity determining regions CDRLl, CDRL2 and CDRL3, wherein CDRHl, CDRH2, CDRH3, CDRLl, CDRL2, and CDRL3 comprise the amino acid sequences set forth in SEQ ID NOs: 79, 90, 98, 100, 104, and 105, respectively.
  • the heavy chain variable region comprises an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, 97%, 98%, or 99% identical to the amino acid sequence of SEQ ID NO: 65 or 220. In certain embodiments, the heavy chain variable region comprises an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 65 or 220. In certain embodiments, the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 220. In certain embodiments, the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 65. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 226.
  • the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 169.
  • the light chain variable region comprises an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, 97%, 98%, or 99% identical to the amino acid sequence of SEQ ID NO: 73 or 221.
  • the light chain variable region comprises an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 73 or 221.
  • the light chain variable region comprises the amino acid sequence of SEQ ID NO: 221.
  • the light chain variable region comprises the amino acid sequence of SEQ ID NO: 73.
  • the antibody comprises a light chain comprising the amino acid sequence of SEQ ID NO: 228. In certain embodiments, the antibody comprises a light chain comprising the amino acid sequence of SEQ ID NO: 228. In certain embodiments, the antibody comprises a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the heavy chain variable region comprises an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, 97%, 98%, or 99% identical to the amino acid sequence of SEQ ID NO: 65 or 220, and the light chain variable region comprises an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, 97%, 98%, or 99% identical to the amino acid sequence of SEQ ID NO: 73 or 221.
  • the heavy chain variable region comprises an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 65 or 220, and the light chain variable region comprises an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 73 or 221.
  • the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 220. In certain embodiments, the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 65. In certain embodiments, the light chain variable region comprises the amino acid sequence of SEQ ID NO: 73 or 221. In certain embodiments, the light chain variable region comprises the amino acid sequence of SEQ ID NO: 73.
  • the instant disclosure provides an isolated antibody that specifically binds to human LAG-3, comprising a heavy chain variable region comprising the amino acid sequence of SEQ ID NO: 65 or 220.
  • the antibody comprises a light chain variable region comprising an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, 97%, 98%, or 99% identical to the amino acid sequence of SEQ ID NO: 73 or 221.
  • the antibody comprises a light chain variable region comprising an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 73 or 221.
  • the instant disclosure provides an isolated antibody that specifically binds to human LAG-3, comprising a light chain variable region comprising the amino acid sequence of SEQ ID NO: 73 or 221.
  • the antibody comprises a heavy chain variable region comprising an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, 97%, 98%, or 99% identical to the amino acid sequence of SEQ ID NO: 65 or 220.
  • the antibody comprises a heavy chain variable region comprising an amino acid sequence that is at least 98% identical to the amino acid sequence of SEQ ID NO: 65 or 220.
  • the antibody comprises a heavy chain variable region comprising the framework regions of the heavy chain variable region sequence of SEQ ID NO: 151 or 222. In certain embodiments, the antibody comprises a heavy chain variable region comprising the amino acid sequence of SEQ ID NO: 151 or 222. In certain embodiments, the antibody comprises a heavy chain variable region comprising the framework regions of the heavy chain variable region sequence of SEQ ID NO: 218 or 223. In certain embodiments, the antibody comprises a heavy chain variable region comprising the amino acid sequence of SEQ ID NO: 218 or 223.
  • the antibody comprises a heavy chain variable region comprising an amino acid sequence which is at least 75%, 80%, 85%, 90%, 95%, or 100% identical to an amino acid sequence selected from the group consisting of SEQ ID NOs: 56-72 and 220. In certain embodiments, the heavy chain variable region comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 56-72 and 220. In certain embodiments, the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 220. In certain embodiments, the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 65. In certain embodiments, the antibody comprises a heavy chain comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 168- 186 and 225-227.
  • the antibody comprises a heavy chain variable region having human derived framework regions.
  • the antibody comprises a heavy chain variable framework region that is or is derived from an amino acid sequence encoded by a human gene, wherein said amino acid sequence is selected from the group consisting of IGHV 1- 46*01 (SEQ ID NO: 153), IGHVl-69-2*01 (SEQ ID NO: 154), IGHV1-3*01 (SEQ ID NO: 155), IGHV1-24*01 (SEQ ID NO: 156), IGHV1-2*01 (SEQ ID NO: 157), IGHV1-45*01 (SEQ ID NO: 158), and IGHV1- 18*01 (SEQ ID NO: 159).
  • the antibody comprises a heavy chain variable framework region that is derived from the amino acid sequence IGHV1-46*01 (SEQ ID NO: 153), wherein at least one amino acid in the amino acid sequence IGHV1-46*01 (SEQ ID NO: 153) is substituted with an amino acid in an analogous position in a corresponding non-human heavy chain variable framework region.
  • the amino acid substitution is at an amino acid position selected from the group consisting of 4, 5, 12, 23, 27, 28, 29, 30, 48, 69, 71, 75, 76, 80, 81, and 94, wherein the amino acid position is indicated according to the Kabat numbering system.
  • the amino acid substitution is selected from the group consisting of 4M, 5K, 12V, 23T, 27F, 28N, 291, 30K, 481, 691, 71A, 75S, 76N, 80L, 81Q, and 94T, wherein the position of the amino acid substitution is indicated according to the Kabat numbering system.
  • the amino acid substitution is at an amino acid position selected from the group consisting of 4, 27, 28, 29, 30, 69, 71, and 94, wherein the amino acid position is indicated according to the Kabat numbering system.
  • the amino acid substitution is selected from the group consisting of 4M, 27F, 28N, 291, 30K, 691, 71 A, and 94T, wherein the position of the amino acid substitution is indicated according to the Kabat numbering system.
  • the antibody comprises a light chain variable region comprising the framework regions of the light chain variable region sequence of SEQ ID NO: 152 or 224. In certain embodiments, the antibody comprises a light chain variable region comprising the amino acid sequence of SEQ ID NO: 152 or 224. In certain embodiments, the antibody comprises a light chain variable region comprising an amino acid sequence which is at least 75%, 80%, 85%, 90%, 95%, or 100% identical to an amino acid sequence selected from the group consisting of SEQ ID NOs: 73-77 and 221. In certain embodiments, the light chain variable region comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 73-77 and 221.
  • the light chain variable region comprises the amino acid sequence of SEQ ID NO: 221. In certain embodiments, the light chain variable region comprises the amino acid sequence of SEQ ID NO: 73. In certain embodiments, the antibody comprises a light chain comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 187- 191. In certain embodiments, the antibody comprises a light chain variable region having human derived framework regions.
  • the antibody comprises a light chain variable framework region that is or is derived from an amino acid sequence encoded by a human gene, wherein said amino acid sequence is selected from the group consisting of IGKV3-20*01 (SEQ ID NO: 160), IGKV3D-15*01 (SEQ ID NO: 161), IGKV3-15*01 (SEQ ID NO: 161), IGKV3D-20*01 (SEQ ID NO: 162), IGKV3D-7*01 (SEQ ID NO: 163), IGKV1-9*01 (SEQ ID NO: 164), and IGKV3-11*01 (SEQ ID NO: 165).
  • the antibody comprises a light chain variable framework region that is from the amino acid sequence IGKV3-20*01 (SEQ ID NO: 160). In certain embodiments, the antibody comprises a light chain variable framework region that is derived from the amino acid sequence IGKV3-20*01 (SEQ ID NO: 160), wherein at least one amino acid in the amino acid sequence IGKV3-20*01 (SEQ ID NO: 160) is substituted with an amino acid in an analogous position in a corresponding non- human light chain variable framework region. In certain embodiments, the amino acid substitution is at an amino acid position selected from the group consisting of 3, 22, 36, 43, 47, 58, 70, and 71, wherein the amino acid position is indicated according to the Kabat numbering system.
  • the amino acid substitution is selected from the group consisting of 3L, 22T, 36F, 43S, 47W, 58V, 70S, and 71Y, wherein the position of the amino acid substitution is indicated according to the Kabat numbering system.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain variable region comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 56-72 and 220.
  • the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 220.
  • the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 65.
  • the antibody comprises a heavy chain comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 168-186 and 225-227.
  • the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 225.
  • the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 168.
  • the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 226. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 169. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 227. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 170.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain variable region comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 56-72 and 220.
  • the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 220.
  • the heavy chain variable region comprises the amino acid sequence of SEQ ID NO: 65.
  • the antibody comprises a heavy chain comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 168-186 and 225-227.
  • the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 225.
  • the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 168. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 226. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 169. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 227. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 170.
  • the instant disclosure provides an antibody or isolated antibody comprising a light chain variable region comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 73-77 and 221.
  • the light chain variable region comprises the amino acid sequence of SEQ ID NO: 221.
  • the light chain variable region comprises the amino acid sequence of SEQ ID NO: 73.
  • the antibody comprises a light chain comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 187-191, and 228.
  • the antibody comprises a light chain comprising the amino acid sequence of SEQ ID NO: 228.
  • the antibody comprises a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a light chain variable region comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 73- 77 and 221.
  • the light chain variable region comprises the amino acid sequence of SEQ ID NO: 221.
  • the light chain variable region comprises the amino acid sequence of SEQ ID NO: 73.
  • the antibody comprises a light chain comprising an amino acid sequence selected from the group consisting of SEQ ID NOs: 187-191, and 228.
  • the antibody comprises a light chain comprising the amino acid sequence of SEQ ID NO: 228.
  • the antibody comprises a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain variable region and a light chain variable region, wherein the heavy chain variable region and the light chain variable region, respectively, comprise the amino acid sequences set forth in SEQ ID NOs: 56 and 73; 56 and 74; 56 and 75; 56 and 76; 56 and 77; 57 and 73; 57 and 74; 57 and 75; 57 and 76; 57 and 77; 58 and 73; 58 and 74; 58 and 75; 58 and 76; 58 and 77; 59 and 73; 59 and 74; 59 and 75; 59 and 76; 59 and 77; 60 and 73; 60 and 74; 60 and 75; 60 and 76; 60 and 77; 61 and 77; 62 and 77; 63 and 73; 64 and 73; 65 and 73; 220 and 73; 65 and 221; 220 and 221; 66 and 73; 67 and 73
  • the heavy chain variable region and the light chain variable region respectively, comprise the amino acid sequences set forth in SEQ ID NOs: 65 and 73. In certain embodiments, the heavy chain variable region and the light chain variable region, respectively, comprise the amino acid sequences set forth in SEQ ID NOs: 220 and 73; 65 and 221; or 220 and 221.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain variable region and a light chain variable region, wherein the amino acid sequences of the heavy chain variable region and the light chain variable region, respectively, consist of the amino acid sequences set forth in SEQ ID NOs: 56 and 73; 56 and 74; 56 and 75; 56 and 76; 56 and 77; 57 and 73; 57 and 74; 57 and 75; 57 and 76; 57 and 77;
  • the amino acid sequences of the heavy chain variable region and the light chain variable region consist of the amino acid sequences set forth in SEQ ID NOs: 65 and 73. In certain embodiments, the amino acid sequences of the heavy chain variable region and the light chain variable region, respectively, consist of the amino acid sequences set forth in SEQ ID NOs: 220 and 73; 65 and 221; or 220 and 221.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain variable region and a light chain variable region, wherein the heavy chain variable region and the light chain variable region, respectively, comprise the amino acid sequences set forth in SEQ ID NOs: 56 and 73; 56 and 74; 56 and 75; 56 and 76; 56 and 77; 57 and 73; 57 and 74; 57 and 75; 57 and 76; 57 and 77; 58 and 73; 58 and 74; 58 and 75; 58 and 76; 58 and 77; 59 and 73;
  • the heavy chain variable region and the light chain variable region respectively, comprise the amino acid sequences set forth in SEQ ID NOs: 65 and 73. In certain embodiments, the heavy chain variable region and the light chain variable region, respectively, comprise the amino acid sequences set forth in SEQ ID NOs: 220 and 73; 65 and 221 ; or 220 and 221.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain variable region and a light chain variable region, wherein the amino acid sequences of the heavy chain variable region and the light chain variable region, respectively, consist of the amino acid sequences set forth in SEQ ID NOs: 56 and 73; 56 and 74; 56 and 75; 56 and 76; 56 and 77; 57 and 73; 57 and 74; 57 and 75; 57 and 76; 57 and 77; 58 and 73; 58 and 74; 58 and 75; 58 and 76; 58 and 77; 59 and 73; 59 and 74; 59 and 75; 59 and 76; 59 and 77; 60 and 73; 60 and 74; 60 and 75; 60 and 76; 60 and 77; 61 and 77; 62 and 77; 63 and 73; 64 and 73; 65 and 73; 220 and 73; 65 and
  • the amino acid sequences of the heavy chain variable region and the light chain variable region consist of the amino acid sequences set forth in SEQ ID NOs: 65 and 73. In certain embodiments, the amino acid sequences of the heavy chain variable region and the light chain variable region, respectively, consist of the amino acid sequences set forth in SEQ ID NOs: 220 and 73; 65 and 221; or 220 and 221.
  • the X in SEQ ID NO: 220 is Q. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 220 is pyroglutamate. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 221 is E. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 221 is pyroglutamate. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 220 is Q, and the X in SEQ ID NO: 221 is E.
  • the X in SEQ ID NO: 220 is Q, and the X in SEQ ID NO: 221 is pyroglutamate. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 220 is pyroglutamate, and the X in SEQ ID NO: 221 is E. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 220 is pyroglutamate, and the X in SEQ ID NO: 221 is pyroglutamate.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 168 or 225, and a light chain comprising the amino acid sequence of SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 168, and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 168 or 225, and a light chain comprising the amino acid sequence of SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 168, and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 169 or 226, and a light chain comprising the amino acid sequence of SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 169, and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 169 or 226, and a light chain comprising the amino acid sequence of SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 169, and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 170 or 227, and a light chain comprising the amino acid sequence of SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 170, and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 170 or 227, and a light chain comprising the amino acid sequence of SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 170, and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain and a light chain, wherein the amino acid sequence of the heavy chain consists of the amino acid sequence set forth in SEQ ID NO: 168 or 225, and the amino acid sequence of the light chain consists of the amino acid sequence set forth in SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain and a light chain, wherein the amino acid sequences of the heavy chain and the light chain, respectively, consist of the amino acid sequences set forth in SEQ ID NOs: 168 and 187.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain and a light chain, wherein the amino acid sequence of the heavy chain consists of the amino acid sequence set forth in SEQ ID NO: 168 or 225, and the amino acid sequence of the light chain consists of the amino acid sequence set forth in SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain and a light chain, wherein the amino acid sequences of the heavy chain and the light chain, respectively, consist of the amino acid sequences set forth in SEQ ID NOs: 168 and 187.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain and a light chain, wherein the amino acid sequence of the heavy chain consists of the amino acid sequence set forth in SEQ ID NO: 169 or 226, and the amino acid sequence of the light chain consists of the amino acid sequence set forth in SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain and a light chain, wherein the amino acid sequences of the heavy chain and the light chain, respectively, consist of the amino acid sequences set forth in SEQ ID NOs: 169 and 187.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain and a light chain, wherein the amino acid sequence of the heavy chain consists of the amino acid sequence set forth in SEQ ID NO: 169 or 226, and the amino acid sequence of the light chain consists of the amino acid sequence set forth in SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain and a light chain, wherein the amino acid sequences of the heavy chain and the light chain, respectively, consist of the amino acid sequences set forth in SEQ ID NOs: 169 and 187.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain and a light chain, wherein the amino acid sequence of the heavy chain consists of the amino acid sequence set forth in SEQ ID NO: 170 or 227, and the amino acid sequence of the light chain consists of the amino acid sequence set forth in SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody comprising a heavy chain and a light chain, wherein the amino acid sequences of the heavy chain and the light chain, respectively, consist of the amino acid sequences set forth in SEQ ID NOs: 170 and 187.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain and a light chain, wherein the amino acid sequence of the heavy chain consists of the amino acid sequence set forth in SEQ ID NO: 170 or 227, and the amino acid sequence of the light chain consists of the amino acid sequence set forth in SEQ ID NO: 187 or 228.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to human LAG-3, the antibody comprising a heavy chain and a light chain, wherein the amino acid sequences of the heavy chain and the light chain, respectively, consist of the amino acid sequences set forth in SEQ ID NOs: 170 and 187.
  • the X in SEQ ID NO: 225 is Q. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 225 is pyroglutamate. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 228 is E. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 228 is pyroglutamate. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 225 is Q, and the X in SEQ ID NO: 228 is E.
  • the X in SEQ ID NO: 225 is Q, and the X in SEQ ID NO: 228 is pyroglutamate. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 225 is pyroglutamate, and the X in SEQ ID NO: 228 is E. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 225 is pyroglutamate, and the X in SEQ ID NO: 228 is pyroglutamate.
  • the X in SEQ ID NO: 226 is Q. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 226 is pyroglutamate. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 228 is E. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 228 is pyroglutamate. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 226 is Q, and the X in SEQ ID NO: 228 is E. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO:
  • the X in SEQ ID NO: 226 is Q, and the X in SEQ ID NO: 228 is pyroglutamate.
  • the X in SEQ ID NO: 226 is pyroglutamate
  • the X in SEQ ID NO: 228 is E.
  • the X in SEQ ID NO: 226 is pyroglutamate
  • the X in SEQ ID NO: 228 is pyroglutamate.
  • the X in SEQ ID NO: 227 is Q. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 227 is pyroglutamate. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 228 is E. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 228 is pyroglutamate. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO: 227 is Q, and the X in SEQ ID NO: 228 is E. In certain embodiments of any one of the foregoing aspects where applicable, the X in SEQ ID NO:
  • the X in SEQ ID NO: 227 is Q, and the X in SEQ ID NO: 228 is pyroglutamate.
  • the X in SEQ ID NO: 227 is pyroglutamate
  • the X in SEQ ID NO: 228 is E.
  • the X in SEQ ID NO: 227 is pyroglutamate
  • the X in SEQ ID NO: 228 is pyroglutamate.
  • the antibody comprises a heavy chain constant region selected from the group consisting of human IgGi, IgG 2 , IgG 3 , IgG/ t , IgAi, and IgA 2 .
  • the heavy chain constant region is IgGi.
  • the amino acid sequence of IgGi comprises a N297A mutation, numbered according to the EU numbering system.
  • the antibody comprises a heavy chain constant region comprising the amino acid sequence of SEQ ID NO: 194.
  • the amino acid sequence of IgGi comprises a N297Q mutation, numbered according to the EU numbering system.
  • the IgGi is afucosylated IgGi.
  • the heavy chain constant region is IgG.
  • the amino acid sequence of IgG 4 comprises a S228P mutation, numbered according to the EU numbering system.
  • the antibody comprises a heavy chain constant region comprising the amino acid sequence of SEQ ID NO: 196.
  • the antibody comprises a light chain constant region selected from the group consisting of human IgGK and IgG .
  • the light chain constant region is IgGK.
  • the antibody comprises a light chain constant region comprising the amino acid sequence of SEQ ID NO: 198.
  • the antibody comprises a light chain constant region comprising the amino acid sequence of SEQ ID NO: 219.
  • the light chain constant region is IgG .
  • the instant disclosure provides an antibody or isolated antibody that cross-competes for binding to human LAG-3 with an antibody as disclosed herein.
  • the instant disclosure provides an antibody or isolated antibody that cross-competes for binding to human LAG-3 with an antibody comprising the heavy and light chain variable region amino acid sequences set forth in SEQ ID NOs: 15 and 16, respectively.
  • the instant disclosure provides an antibody or isolated antibody that cross-competes for binding to human LAG-3 with an antibody comprising the heavy and light chain variable region amino acid sequences set forth in SEQ ID NOs: 65 and 73; 220 and 73; 65 and 221 ; or 220 and 221, respectively.
  • the instant disclosure provides an antibody or isolated antibody that binds to the same epitope of human LAG-3 as an antibody disclosed herein.
  • the instant disclosure provides an antibody or isolated antibody that binds to the same epitope of human LAG-3 as an antibody comprising the heavy and light chain variable region amino acid sequences set forth in SEQ ID NOs: 15 and 16, respectively.
  • the instant disclosure provides an antibody or isolated antibody that binds to the same epitope of human LAG-3 as an antibody comprising the heavy and light chain variable region amino acid sequences set forth in SEQ ID NOs: 65 and 73; 220 and 73 ; 65 and 221 ; or 220 and 221, respectively.
  • the instant disclosure provides an antibody or isolated antibody that binds, e.g. , specifically binds, to an epitope of human LAG-3.
  • the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 216.
  • the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 215.
  • the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 214.
  • the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 213. In certain embodiments, the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 212. In certain embodiments, the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 211.
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to the same epitope of human LAG-3 as any antibody of the present invention.
  • the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 216.
  • the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 215.
  • the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 214.
  • the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 213. In certain embodiments, the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 212. In certain embodiments, the antibody binds to an epitope located within a region of human LAG-3 consisting of the amino acid sequence of SEQ ID NO: 211.
  • the instant disclosure provides an antibody that, when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 216 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 216 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the instant disclosure provides an antibody that, when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 215 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 215 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the instant disclosure provides an antibody that, when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 214 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 214 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the instant disclosure provides an antibody that, when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 213 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 213 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the instant disclosure provides an antibody that, when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 212 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 212 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the instant disclosure provides an antibody that, when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 211 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 211 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the reduction in hydrogen/deuterium exchange is measured using hydrogen-deuterium exchange (HDX), for example as described herein in the examples.
  • HDX hydrogen-deuterium exchange
  • the instant disclosure provides an antibody or isolated antibody that specifically binds to the same epitope of human LAG-3 as any antibody of the present invention.
  • the antibody when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 216 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 216 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the antibody when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 215 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 215 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the antibody when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 214 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 214 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the antibody when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 213 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 213 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the antibody when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 212 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 212 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the antibody when bound to a human LAG-3 protein or fragment thereof comprising the amino acid sequence of SEQ ID NO: 217, reduces hydrogen/deuterium exchange in a region consisting of the amino acid sequence set forth in SEQ ID NO: 211 relative to hydrogen/deuterium exchange in the region consisting of the amino acid sequence set forth in SEQ ID NO: 211 in the absence of the antibody, as determined by a hydrogen/deuterium assay.
  • the reduction in hydrogen/deuterium exchange is measured using hydrogen-deuterium exchange (HDX), for example as described herein in the examples.
  • HDX hydrogen-deuterium exchange
  • the antibody is a humanized antibody. In certain embodiments, the antibody is a murine antibody. In certain embodiments, the antibody is a chimeric antibody. In certain embodiments, the antibody is antagonistic to human LAG-3. In certain embodiments, the antibody deactivates, reduces, or inhibits an activity of human LAG-3. In certain embodiments, the antibody inhibits binding of human LAG-3 to MHC class II. In certain embodiments, the antibody induces IL-2 production by peripheral blood mononuclear cells (PBMCs) stimulated with staphylococcal enterotoxin A (SEA). In certain embodiments, the antibody induces TNFa production by tumor infiltrating lymphocytes (TILs) stimulated with anti-CD3 and anti-CD28 antibodies.
  • PBMCs peripheral blood mononuclear cells
  • SEA staphylococcal enterotoxin A
  • TILs tumor infiltrating lymphocytes
  • the instant disclosure provides an antibody or isolated antibody as disclosed herein conjugated to a cytotoxic agent.
  • the instant disclosure provides an antibody or isolated antibody as disclosed herein conjugated to a cytostatic agent.
  • the instant disclosure provides an antibody or isolated antibody as disclosed herein conjugated to a toxin.
  • the instant disclosure provides an antibody or isolated antibody as disclosed herein conjugated to a radionuclide.
  • the instant disclosure provides an antibody or isolated antibody as disclosed herein conjugated to a detectable label.
  • the instant disclosure provides an antibody or isolated antibody as disclosed herein, wherein the N-terminal amino acid residue of the heavy chain variable region is pyroglutamate (e.g., as a result of post-translational cyclization of the free amino group of the N-terminal E or Q residue of the heavy chain variable region).
  • the instant disclosure provides an antibody or isolated antibody as disclosed herein, wherein the N-terminal amino acid residue of the heavy chain is pyroglutamate (e.g., as a result of post-translational cyclization of the free amino group of the N-terminal E or Q residue of the heavy chain).
  • the instant disclosure provides an antibody or isolated antibody as disclosed herein, wherein the N-terminal amino acid residue of the light chain variable region is pyroglutamate (e.g., as a result of post-translational cyclization of the free amino group of the N-terminal E or Q residue the light chain variable region).
  • the instant disclosure provides an antibody or isolated antibody as disclosed herein, wherein the N-terminal amino acid residue of the light chain is pyroglutamate (e.g., as a result of post- translational cyclization of the free amino group of the N-terminal E or Q residue the light chain).
  • the instant disclosure provides an antibody or isolated antibody as disclosed herein, in which the heavy chain is aglycosylated.
  • the instant disclosure provides a pharmaceutical composition
  • a pharmaceutical composition comprising an antibody as disclosed herein and a pharmaceutically acceptable carrier or excipient.
  • the instant disclosure provides a polynucleotide isolated polynucleotide encoding a heavy and/or light chain of an antibody as disclosed herein.
  • the instant disclosure provides a vector comprising the polynucleotide.
  • the instant disclosure provides a recombinant host cell comprising the polynucleotide.
  • the instant disclosure provides a recombinant host cell comprising the vector.
  • the instant disclosure provides a method of producing an antibody as disclosed herein, the method comprising culturing the host cell so that the polynucleotide is expressed and the antibody is produced. In one embodiment, the method is an in vitro method.
  • the present invention relates to an antibody of the invention, or a pharmaceutical composition of the invention, or a polynucleotide of the invention, or a vector of the invention, or a recombinant host cell of the invention for use as a medicament.
  • the present invention relates to an antibody of the invention, or a pharmaceutical composition of the invention, or a polynucleotide of the invention, or a vector of the invention, or a recombinant host cell of the invention for use as a diagnostic.
  • the instant disclosure provides a method of increasing T cell activation in response to an antigen in a subject, the method comprising administering to the subject an effective amount of an antibody or pharmaceutical composition as disclosed herein.
  • the instant disclosure provides a method of treating cancer in a subject, the method comprising administering to the subject an effective amount of an antibody or pharmaceutical composition as disclosed herein.
  • the antibody or pharmaceutical composition is administered subcutaneously.
  • the antibody or pharmaceutical composition is administered intravenously.
  • the antibody or pharmaceutical composition is administered intratumorally.
  • the antibody or pharmaceutical composition is delivered to a tumor draining lymph node.
  • the antibody or pharmaceutical composition is administered intra-arterially.
  • the antibody or pharmaceutical composition is administered intranasally.
  • the present invention relates to an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention for use in a method for increasing T cell activation in response to an antigen.
  • the present invention relates to an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention for use in a method for increasing T cell activation in response to an antigen in a subject.
  • the present invention relates to an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention for use in a method for increasing T cell activation in response to an antigen in a subject comprising administering to the subject an effective amount of an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the invention.
  • the present invention relates to an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention for use in a method for the treatment of cancer.
  • the present invention relates to an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention for use in a method for the treatment of cancer in a subject.
  • the present invention relates to an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention for use in a method for the treatment of cancer in a subject comprising administering to the subject an effective amount of an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the invention.
  • an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition for use of the present invention the antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition is administered subcutaneously or intravenously.
  • the antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition is administered intratumorally or intra-arterially.
  • an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition for use of the present invention, the antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition is administered intranasally.
  • the foregoing methods further comprise administering an additional therapeutic agent to the subject. Therefore, in one embodiment of an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition for use in a method of the present invention, the method further comprises administering an additional therapeutic agent to the subject.
  • the present invention relates to (a) an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention and (b) an additional therapeutic agent for use as a medicament.
  • the present invention relates to (a) an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention and (b) an additional therapeutic agent for use in a method for the treatment of cancer.
  • the present invention relates to a pharmaceutical composition, kit or kit-of-parts comprising (a) an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention and (b) an additional therapeutic agent.
  • the additional therapeutic agent is a chemotherapeutic. In certain embodiments, the additional therapeutic agent is a radiotherapeutic.
  • the additional therapeutic agent is a checkpoint targeting agent.
  • the checkpoint targeting agent is selected from the group consisting of an antagonist anti-PD-1 antibody, an antagonist anti-PD-Ll antibody, an antagonist anti-PD-L2 antibody, an antagonist anti-CTLA-4 antibody, an antagonist anti- TIM-3 antibody, an antagonist anti-LAG-3 antibody, an antagonist anti-CEACAMl antibody, an agonist anti-GITR antibody, an agonist anti-OX40 antibody, an antagonist anti-TIGIT antibody, an agonist anti-CD137 antibody, an antagonist anti- VISTA antibody, an antagonist anti-CD73 antibody, and an antagonist anti-CD96 antibody.
  • the additional therapeutic agent is an anti-PD-1 antibody.
  • the anti-PD- 1 antibody is pembrolizumab. In certain embodiments, the anti-PD- 1 antibody is nivolumab. In certain embodiments, the additional therapeutic agent is an anti-PD-Ll antibody. In certain embodiments, the additional therapeutic agent is an anti-CTLA-4 antibody.
  • the additional therapeutic agent comprises a small molecule.
  • the additional therapeutic agent is a small molecule inhibitor of the PD-1 pathway.
  • the additional therapeutic agent is a small molecule inhibitor of PD- 1 or PD-L 1.
  • the additional therapeutic agent is an inhibitor of indoleamine-2,3-dioxygenase (IDO).
  • the inhibitor is selected from the group consisting of epacadostat, BMS-986205 (also known as F001287, see Example 19 of WO2016/073770, which is incorporated by reference herein in its entirety), indoximod, and NLG919.
  • the inhibitor is epacadostat.
  • the inhibitor is BMS-986205.
  • the inhibitor is indoximod.
  • the inhibitor is NLG919.
  • the additional therapeutic agent is an inhibitor of ARG, LSDl, CD112, CD 112R, or VEGF.
  • the additional therapeutic agent is a Stimulator of Interferon Genes (STING) agonist.
  • the additional therapeutic agent is a CD80-Fc protein.
  • the additional therapeutic agent is a vaccine.
  • the vaccine comprises a heat shock protein peptide complex (HSPPC) comprising a heat shock protein complexed with an antigenic peptide.
  • HSPPC heat shock protein peptide complex
  • the heat shock protein is hsc70 and is complexed with a tumor-associated antigenic peptide.
  • the heat shock protein is gp96 protein and is complexed with a tumor-associated antigenic peptide, wherein the HSPPC is derived from a tumor obtained from a subject.
  • the heat shock protein is gp96 protein and is complexed with a tumor-associated antigenic peptide, wherein the HSPPC is derived from a tumor obtained from a subject.
  • the additional therapeutic agent comprises a TCR. In certain embodiments, the additional therapeutic agent is a soluble TCR. In certain embodiments, the additional therapeutic agent is a cell expressing a TCR. In certain embodiments, the additional therapeutic agent is a cell expressing a chimeric antigen receptor. In certain embodiments, the additional therapeutic agent is an antibody that specifically binds to a peptide-MHC complex. In certain embodiments, the additional therapeutic agent is an adjuvant.
  • the present invention relates to (a) an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention and (b) a vaccine for use as a medicament, for example, for use in a method for the treatment of cancer, optionally wherein the vaccine comprises a heat shock protein peptide complex (HSPPC) comprising a heat shock protein complexed with an antigenic peptide.
  • HSPPC heat shock protein peptide complex
  • the present invention relates to a pharmaceutical composition, kit or kit-of-parts comprising (a) an antibody, polynucleotide, vector, recombinant host cell, and/or pharmaceutical composition of the present invention and (b) a vaccine, optionally wherein the vaccine comprises a heat shock protein peptide complex (HSPPC) comprising a heat shock protein complexed with an antigenic peptide.
  • HSPPC heat shock protein peptide complex
  • Figures 1A, IB, and 1C are a set of histograms showing the binding of anti- LAG-3 Fabs to wild type Jurkat cells or Jurkat cells engineered to express human LAG-3, as measured by flow cytometry.
  • the anti-LAG-3 Fabs tested in this study include P01A 12, P01C09, P05E01, P13A04, P13A06, P 13B01, P13B02, P 13B03, P 13B 11, P13C06, P13C08, P13C 10, P13D04, P 13D05, P13E02, P 13F01, P13F02, P13F06, P13F09, P13G01, P 13G04, P13G05, P13H05, P 14A04, P 14B07, P14C04, P14F01, P 14F06, P14G01, P14G03, P 15B06, P15C02, P 15E06, P15F06, P 15G05, P16D04, and
  • Figures 2A and 2B are graphs showing results from assays testing the ability of anti-LAG-3 Fabs or a negative control Fab not specific for LAG-3 to block the binding of cross-linked recombinant LAG-3-6His to MHC class II expressing Raji cells.
  • Figure 2A is a bar graph showing the percentage of blocking mediated by the negative control Fab or anti- LAG-3 Fab P 13B02, P13C08, P 13C 10, P13E02, P13F02, P01A12, P 13B01, P05E01, or P01C09.
  • Figure 2B is a line graph showing the percentage of LAG-3 binding in the presence of a dose titration of anti-LAG-3 Fab P01A12, P13A06, P13B01, P13B02, P 13C06, P13C08, P13C 10, P 13E02, or P 14C04, or the negative control Fab.
  • Figure 3 is a line graph similar to the one shown in Figure 2B, in which the percentage of LAG-3 binding is plotted against a dose titration of full length chimeric anti- LAG-3 antibody P13A06, P 13B01, P 13B02, P13C06, P 13C08, or P13E02, or an isotype control antibody.
  • Figure 4 is a graph showing the production of IL-2 in human peripheral blood mononuclear cells (PBMCs) upon Staphylococcus Enterotoxin A (SEA) stimulation in the absence of any antibody, or in the presence of an isotype control antibody or the chimeric anti-LAG-3 antibody P13B02.
  • PBMCs peripheral blood mononuclear cells
  • SEA Staphylococcus Enterotoxin A
  • Figures 5A and 5B are sequence alignments of humanized variable regions with corresponding murine sequences and human germline sequences.
  • Figure 5A is a sequence alignment comparing the humanized heavy chain variable regions H0-H4 (SEQ ID NOs: 56- 60, respectively), the murine antibody P13B02 heavy chain variable region (SEQ ID NO: 15), and the human germline sequences IGHV1-46*01 (SEQ ID NO: 153) and IGHJ1*01 (SEQ ID NO: 200).
  • Figure 5B is a sequence alignment comparing the humanized light chain variable regions L0-L4 (SEQ ID NOs: 73-77, respectively), the murine antibody P13B02 light chain variable region (SEQ ID NO: 16), and the human germline sequences IGKV3- 20*01 (SEQ ID NO: 160) and IGKJ1*01 (SEQ ID NO: 201). Dots represent residues identical to corresponding residues in HO ( Figure 5A) or L0 ( Figure 5B). Dashes represent lack of amino acid residues compared with HO ( Figure 5A) or L0 ( Figure 5B).
  • Figure 6A and 6B are graphs showing the binding of anti-LAG-3 antibodies to human T cells activated by Staphylococcus Enterotoxin A (SEA), as measured by flow cytometry.
  • Figure 6A is a set of histograms testing the chimeric antibody P13B02 (IgGi), and the humanized antibodies P 13B02-06 (IgGi), P 13B02-07 (IgGi), P 13B02-16 (IgGi), P13B02-25 (IgGi), P 13B02-26 (IgGi), P 13B02-27 (IgGi), P 13B02-30 (IgGi Glml7 N297A), and P13B02-30 (IgG/ t ).
  • Figure 6B is a graph showing the binding of the anti-LAG- 3 antibody P13B02- 16 (IgGi) or an isotype control antibody to activated primary human CD4+ T cells.
  • the median fluorescence intensity (MFI) values are plotted against antibody concentrations.
  • Figures 7A and 7B are line graphs similar to the one shown in Figure 2B, in which the percentage of LAG-3 binding is plotted against different doses of an isotype control antibody, the chimeric antibody P13B02 (IgGi), the humanized antibody P13B02-06 (IgGi), P 13B02-07 (IgGi), P13B02-16 (IgGi), P13B02-26 (IgGi), or P 13B02-27 (IgGi) ( Figure 7A) or the humanized antibody P 13B02-30 (IgGi Glml7 N297A) ( Figure 7B).
  • Figures 8A and 8B are graphs showing the production of IL-2 induced by anti- LAG-3 antibody or isotype control antibody in human peripheral blood mononuclear cells (PBMCs) upon Staphylococcus Enterotoxin A (SEA) stimulation.
  • PBMCs peripheral blood mononuclear cells
  • SEA Staphylococcus Enterotoxin A
  • the anti- LAG-3 antibody tested is P 13B02-30 (IgGi).
  • the anti-LAG-3 antibody P13B02- 16 (IgGi) or an isotype control antibody was tested in the presence or absence of anti-PD-1 antibody pembrolizumab (Pembro) or nivolumab (Nivo), anti-PD-Ll antibody #1, #2, or #3, or anti-CTLA-4 antibody ipilimumab (Ipi).
  • FIGS 9A and 9B are graphs showing TNFa production of primary tumor infiltrating lymphocytes (TILs) induced by anti-LAG-3 antibody P 13B02-30 (IgGi Glm3 N297A) or an isotype control antibody, either alone or in combination with the anti-PD-1 antibody pembrolizumab (Pembro).
  • TILs primary tumor infiltrating lymphocytes
  • the TILs were isolated from renal cell carcinoma ( Figure 9A) or colorectal cancer ( Figure 9B) tumors and activated with anti-CD3/CD28 microbeads.
  • FIGS 10A and 10B are graphs showing that the anti-LAG-3 antibody P13B02-30 (IgGi Glm3 N297A) enhanced T cell activation in a LAG-3 -mediated cell suppression assay.
  • Jurkat-NFAT-luciferase-LAG-3 cells were incubated in the presence of sextuplet dose titrations of either an anti-LAG-3 antibody (black dots) or an isotype control antibody (white dots), a fixed concentration of Raji cells, and a fixed concentration of Staphylococcal Enterotoxin E (SEE) peptide.
  • SEE Staphylococcal Enterotoxin E
  • the instant disclosure provides antibodies that specifically bind to LAG-3 (e.g. , human LAG-3) and antagonize LAG-3 function, e.g., LAG-3-mediated immune suppression.
  • pharmaceutical compositions comprising these antibodies, nucleic acids encoding these antibodies, expression vectors and host cells for making these antibodies, and methods of treating a subject using these antibodies.
  • the antibodies disclosed herein are particularly useful for increasing T cell activation in response to an antigen (e.g. , a tumor antigen or an infectious disease antigen), and hence for treating cancer in a subject or treating or preventing an infectious disease in a subject. All instances of "isolated antibodies" described herein are additionally contemplated as antibodies that may be, but need not be, isolated.
  • isolated polynucleotides are additionally contemplated as polynucleotides that may be, but need not be, isolated.
  • antibodies are additionally contemplated as antibodies that may be, but need not be, isolated.
  • polynucleotides are additionally contemplated as polynucleotides that may be, but need not be, isolated.
  • LAG-3 refers to Lymphocyte activation gene 3 (also known as CD223).
  • human LAG-3 refers to a human LAG-3 protein encoded by a wild type human LAG-3 gene, e.g., GenBankTM accession number NM_002286.5.
  • An exemplary immature amino acid sequence of human LAG-3 is provided as SEQ ID NO: 166.
  • Exemplary mature amino acid sequences of human LAG-3 are provided as SEQ ID NO: 167 and SEQ ID NO: 210.
  • antibody and “antibodies” include full length antibodies, antigen-binding fragments of full length antibodies, and molecules comprising antibody CDRs, VH regions or VL regions.
  • antibodies include monoclonal antibodies, recombinantly produced antibodies, monospecific antibodies, multispecific antibodies (including bispecific antibodies), human antibodies, humanized antibodies, chimeric antibodies, murine antibodies, immunoglobulins, synthetic antibodies, tetrameric antibodies comprising two heavy chain and two light chain molecules, an antibody light chain monomer, an antibody heavy chain monomer, an antibody light chain dimer, an antibody heavy chain dimer, an antibody light chain- antibody heavy chain pair, intrabodies, heteroconjugate antibodies, antibody-drug conjugates, single domain antibodies, monovalent antibodies, single chain antibodies or single-chain Fvs (scFv), camelized antibodies, affybodies, Fab fragments, F(ab')2 fragments, disulfide-linked Fvs (sdFv), anti-idiotypic (scFv), camelized antibodies, affy
  • antibodies described herein refer to polyclonal antibody populations.
  • Antibodies can be of any type (e.g., IgG, IgE, IgM, IgD, IgA or IgY), any class (e.g. , lgG h IgG 2 , IgG 3 , IgG 4 , IgAi or IgA 2 ), or any subclass (e.g. , IgG 2a or IgG 2b ) of immunoglobulin molecule.
  • antibodies described herein are IgG antibodies, or a class (e.g. , human IgGi or IgG/ t ) or subclass thereof.
  • the antibody is a humanized monoclonal antibody.
  • the antibody is a human monoclonal antibody.
  • VH region and “VL region” refer to single antibody heavy and light chain variable regions, respectively, comprising FR (Framework Regions) 1, 2, 3 and 4 and CDR (Complementarity Determining Regions) 1, 2 and 3 (see Kabat et al , (1991) Sequences of Proteins of Immunological Interest (NIH Publication No. 91-3242, Bethesda), which is herein incorporated by reference in its entirety).
  • CDR complementarity determining region
  • CDR is a CDR as defined by Kabat et al, J. Biol. Chem. 252, 6609-6616 (1977) and Kabat et al, Sequences of protein of immunological interest. (1991).
  • CDR is a CDR as defined by Chothia et al, J. Mol. Biol. 196:901-917 (1987).
  • CDR is a CDR as defined by MacCallum et al, J. Mol. Biol.
  • framework (FR) amino acid residues refers to those amino acids in the framework region of an immunoglobulin chain.
  • framework region or "FR region” as used herein, includes the amino acid residues that are part of the variable region, but are not part of the CDRs (e.g. , using the Kabat or Chothia definition of CDRs).
  • variable region typically refers to a portion of an antibody, generally, a portion of a light or heavy chain, typically about the amino- terminal 1 10 to 125 amino acids in the mature heavy chain and about 90 to 1 15 amino acids in the mature light chain, which differ extensively in sequence among antibodies and are used in the binding and specificity of a particular antibody for its particular antigen.
  • CDRs complementarity determining regions
  • FR framework regions
  • variable region is a human variable region.
  • variable region comprises rodent or murine CDRs and human framework regions (FRs).
  • FRs human framework regions
  • the variable region is a primate (e.g., non-human primate) variable region.
  • the variable region comprises rodent or murine CDRs and primate (e.g. , non-human primate) framework regions (FRs).
  • VL and “VL domain” are used interchangeably to refer to the light chain variable region of an antibody.
  • VH and "VH domain” are used interchangeably to refer to the heavy chain variable region of an antibody.
  • constant region and “constant domain” are interchangeable and are common in the art.
  • the constant region is an antibody portion, e.g. , a carboxyl terminal portion of a light and/or heavy chain which is not directly involved in binding of an antibody to antigen but which can exhibit various effector functions, such as interaction with an Fc receptor (e.g., Fc gamma receptor).
  • Fc receptor e.g., Fc gamma receptor
  • the constant region of an immunoglobulin molecule generally has a more conserved amino acid sequence relative to an immunoglobulin variable domain.
  • the term "heavy chain” when used in reference to an antibody can refer to any distinct type, e.g. , alpha (a), delta ( ⁇ ), epsilon ( ⁇ ), gamma ( ⁇ ), and mu ( ⁇ ), based on the amino acid sequence of the constant domain, which give rise to IgA, IgD, IgE, IgG, and IgM classes of antibodies, respectively, including subclasses of IgG, e.g., IgGi, IgG2, IgG 3 , and IgG 4 .
  • the term "light chain” when used in reference to an antibody can refer to any distinct type, e.g. , kappa ( ⁇ ) or lambda ( ⁇ ) based on the amino acid sequence of the constant domains. Light chain amino acid sequences are well known in the art.
  • EU numbering system refers to the EU numbering convention for the constant regions of an antibody, as described in Edelman, G.M. et al, Proc. Natl. Acad. USA, 63, 78-85 (1969) and Kabat et al , Sequences of Proteins of Immunological Interest, U.S. Dept. Health and Human Services, 5th edition, 1991, each of which is herein incorporated by reference in its entirety.
  • Binding affinity generally refers to the strength of the sum total of non-covalent interactions between a single binding site of a molecule (e.g. , an antibody) and its binding partner (e.g. , an antigen). Unless indicated otherwise, as used herein, "binding affinity” refers to intrinsic binding affinity which reflects a 1 : 1 interaction between members of a binding pair (e.g. , antibody and antigen).
  • the affinity of a molecule X for its partner Y can generally be represented by the dissociation constant (K D ). Affinity can be measured and/or expressed in a number of ways known in the art, including, but not limited to, equilibrium dissociation constant (K D ), and equilibrium association constant (KA).
  • the K D is calculated from the quotient of k 0ff /k on
  • KA is calculated from the quotient of k on /k 0ff
  • k on refers to the association rate constant of, e.g. , an antibody to an antigen
  • k 0ff refers to the dissociation rate constant of, e.g. , an antibody to an antigen.
  • the k on and k 0ff can be determined by techniques known to one of ordinary skill in the art, such as BIAcore® or KinExA.
  • a "lower affinity" refers to a larger KD.
  • the terms “specifically binds,” “specifically recognizes,” “immunospecifically binds,” and “immunospecifically recognizes” are analogous terms in the context of antibodies and refer to molecules that bind to an antigen (e.g. , epitope or immune complex) as such binding is understood by one skilled in the art.
  • a molecule that specifically binds to an antigen can bind to other peptides or polypeptides, generally with lower affinity as determined by, e.g. , immunoassays, BIAcore®, KinExA 3000 instrument (Sapidyne Instruments, Boise, ID), or other assays known in the art.
  • molecules that specifically bind to an antigen bind to the antigen with a KA that is at least 2 logs (i.e. , factors of 10), 2.5 logs, 3 logs, 4 logs or greater than the KA when the molecules bind non-specifically to another antigen.
  • molecules that specifically bind to an antigen do not cross react with other proteins under similar binding conditions.
  • molecules that specifically bind to LAG-3 do not cross react with other non- LAG-3 proteins.
  • an antibody that binds to LAG-3 e.g., human LAG-3) with higher affinity than to another unrelated antigen.
  • an antibody that binds to LAG-3 e.g. , human LAG-3) with a 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95% or higher affinity than to another, unrelated antigen as measured by, e.g.
  • the extent of binding of an anti-LAG-3 antibody described herein to an unrelated, non-LAG-3 protein is less than 10%, 15%, or 20% of the binding of the antibody to LAG-3 protein as measured by, e.g. , a radioimmunoassay.
  • the term "afucosylation" or "afucosylated” in the context of an Fc refers to a substantial lack of a fucose covalently attached, directly or indirectly, to residue 297 of the human IgGi Fc region, numbered according to the EU numbering system, or the corresponding residue in non-IgGi or non-human IgGi immunoglobulins.
  • afucosylation or "afucosylated” in the context of an Fc refers to a substantial lack of a fucose covalently attached, directly or indirectly, to residue 297 of the human IgGi Fc region, numbered according to the EU numbering system, or the corresponding residue in non-IgGi or non-human IgGi immunoglobulins.
  • a composition comprising a plurality of afucosylated antibodies, at least 70% of the antibodies will not be fucosylated, directly or indirectly (e.g.
  • an "epitope" is a term in the art and refers to a localized region of an antigen to which an antibody can specifically bind.
  • An epitope can be, for example, contiguous amino acids of a polypeptide (linear or contiguous epitope) or an epitope can, for example, come together from two or more non-contiguous regions of a polypeptide or polypeptides (conformational, non-linear, discontinuous, or non-contiguous epitope).
  • the epitope to which an antibody binds can be determined by, e.g.
  • crystallization may be accomplished using any of the known methods in the art (e.g., NMR spectroscopy, X-ray diffraction crystallography studies, ELISA assays, hydrogen/deuterium exchange coupled with mass spectrometry (e.g. , liquid chromatography electrospray mass spectrometry), array -based oligo-peptide scanning assays (e.g. , constraining peptides using CLIPS (Chemical Linkage of Peptides onto Scaffolds) to map discontinuous or conformational epitopes), and/or mutagenesis mapping (e.g., site-directed mutagenesis mapping).
  • mass spectrometry e.g. , liquid chromatography electrospray mass spectrometry
  • array -based oligo-peptide scanning assays e.g. , constraining peptides using CLIPS (Chemical Linkage of Peptides onto Scaffolds) to map discontinuous or conformational epitopes
  • Antibody antigen crystals may be studied using well known X-ray diffraction techniques and may be refined using computer software such as X-PLOR (Yale University, 1992, distributed by Molecular Simulations, Inc.; see, e.g.
  • CLIPS Chemical Linkage of Peptides onto Scaffolds
  • CLIPS is a technology to present one or more peptides in a structurally constrained configuration to behave as functional mimics of complex protein domains. See, e.g., U.S. Publication Nos. US 2008/0139407 Al and US 2007/099240 Al, and US Patent No.
  • the epitope of an antibody is determined using alanine scanning mutagenesis studies. In a specific embodiment, the epitope of an antibody is determined using hydrogen/deuterium exchange coupled with mass spectrometry. In a specific embodiment, the epitope of an antibody is determined using CLIPS Epitope Mapping Technology from Pepscan Therapeutics.
  • an epitope located within a region of human LAG-3 consisting of a particular amino acid sequence or a set of amino acid residues refers to an epitope comprising one or more of the amino acid residues of the specified region, wherein the specified region includes the first specified amino acid residue and the last specified amino acid residue of the region of human LAG-3.
  • the epitope comprises each one of the amino acid residues located within the specified region.
  • one or more additional amino acid residues of human LAG-3 outside the specified region bind to an antibody together with an epitope located within the specified region.
  • T cell receptor and "TCR” are used interchangeably and refer to full length heterodimeric ⁇ or ⁇ TCRs, antigen-binding fragments of full length TCRs, and molecules comprising TCR CDRs or variable regions.
  • TCRs include, but are not limited to, full length TCRs, antigen-binding fragments of full length TCRs, soluble TCRs lacking transmembrane and cytoplasmic regions, single-chain TCRs containing variable regions of TCRs attached by a flexible linker, TCR chains linked by an engineered disulfide bond, monospecific TCRs, multi-specific TCRs (including bispecific TCRs), TCR fusions, human TCRs, humanized TCRs, chimeric TCRs, recombinantly produced TCRs, and synthetic TCRs.
  • the term encompasses wild-type TCRs and genetically engineered TCRs (e.g. , a chimeric TCR comprising a chimeric TCR chain which includes a first portion from a TCR of a first species and a second portion from a TCR of a second species).
  • major histocompatibility complex and “MHC” are used interchangeably and refer to an MHC class I molecule and/or an MHC class II molecule.
  • peptide-MHC complex refers to an MHC molecule (MHC class I or MHC class II) with a peptide bound in the art-recognized peptide binding pocket of the MHC.
  • the term “treat,” “treating,” and “treatment” refer to therapeutic or preventative measures described herein.
  • the methods of “treatment” employ administration of an antibody to a subject having a disease or disorder, or predisposed to having such a disease or disorder, in order to prevent, cure, delay, reduce the severity of, or ameliorate one or more symptoms of the disease or disorder or recurring disease or disorder, or in order to prolong the survival of a subject beyond that expected in the absence of such treatment.
  • the term "effective amount" in the context of the administration of a therapy to a subject refers to the amount of a therapy that achieves a desired prophylactic or therapeutic effect.
  • the term "subject" includes any human or non-human animal. In one embodiment, the subject is a human or non-human mammal. In one embodiment, the subject is a human.
  • the determination of "percent identity" between two sequences can be accomplished using a mathematical algorithm.
  • a specific, non-limiting example of a mathematical algorithm utilized for the comparison of two sequences is the algorithm of Karlin S & Altschul SF (1990) PNAS 87: 2264-2268, modified as in Karlin S & Altschul SF (1993) PNAS 90: 5873-5877, each of which is herein incorporated by reference in its entirety.
  • Such an algorithm is incorporated into the NBLAST and XBLAST programs of Altschul SF et al, (1990) J Mol Biol 215: 403, which is herein incorporated by reference in its entirety.
  • Gapped BLAST can be utilized as described in Altschul SF et al, (1997) Nuc Acids Res 25: 3389-3402, which is herein incorporated by reference in its entirety.
  • PSI BLAST can be used to perform an iterated search which detects distant relationships between molecules (Id.).
  • the default parameters of the respective programs e.g., of XBLAST and NBLAST
  • NCBI National Center for Biotechnology Information
  • Another specific, non-limiting example of a mathematical algorithm utilized for the comparison of sequences is the algorithm of Myers and Miller, 1988, CABIOS 4: 11-17, which is herein incorporated by reference in its entirety.
  • the percent identity between two sequences can be determined using techniques similar to those described above, with or without allowing gaps. In calculating percent identity, typically only exact matches are counted.
  • the instant disclosure provides antibodies that specifically bind to LAG-3 (e.g. , human LAG-3) and antagonize LAG-3 function.
  • LAG-3 e.g. , human LAG-3
  • amino acid sequences of exemplary antibodies are set forth in Tables 1-7 herein.
  • the N-terminal E or Q amino acid residue can, under certain conditions, spontaneously convert to pyroglutamate by post-translational cyclization of the free amino group to form a lactam.
  • the instant disclosure provides antibodies comprising an antibody heavy chain variable region or light chain variable region disclosed herein (e.g. SEQ ID NOs: 56-72 and 73-77, respectively) or full length heavy chain or light chain disclosed herein (e.g.
  • Xi is T or N
  • X2 is I or M
  • X 3 is H, Y or D
  • Xi is T or N
  • X2 is I or M
  • X 3 is H or Y
  • Xi is E, R, S, or K
  • X 2 is D or G
  • X 3 is N or H
  • X 4 is T or S
  • X 5 is K or H
  • X 6 is Y or F
  • X 7 is D or A
  • X 8 is K or R
  • Xg is F or L
  • X10 is G or D
  • Xi is E, R, or S ;
  • X 2 is D or G
  • X 3 is N or H
  • X 4 is T or S
  • X 5 is Y or F
  • X 6 is D or A
  • X 7 is K or R
  • X 8 is G or D
  • Xi is Y, F, or S
  • X 2 is Y or D
  • X 3 is K or R
  • X 4 is D or E
  • X 5 is F or C
  • Xi is Y, F, or S
  • X 2 is Y or D
  • X 3 is K or R
  • X 4 is F or C
  • Xi is K or R
  • X 2 is D or E
  • Xi is S or G
  • X 2 is N or T
  • X 3 is H or Y
  • Xi is H or Y SEQ Description Amino acid sequence
  • Xi is S, N, or R
  • X 2 is S, T or R;
  • X 3 is F, L, H, or W
  • Xi is S, N, or R
  • X 2 is F, L, or H
  • Xi is M or L
  • X 2 is V or K
  • X 3 is K or V
  • X 4 is K or T
  • X 5 is M or I
  • X 6 is I or M
  • X 7 is A or R
  • X 8 is T or S
  • X 9 is S or N
  • X10 is M or L
  • X11 is E or Q
  • X12 is T or R
  • Xi3 is K or R
  • Xi4 is D or E
  • Xi is M or L
  • X 2 is V or K
  • X 3 is K or V
  • X 4 is K or T
  • X 5 is M or I
  • X 6 is I or M
  • X 7 is A or R
  • X 8 is T or S
  • X 9 is S or N
  • X10 is M or L
  • X11 is E or Q
  • X12 is T or R
  • Xi3 is K or R
  • Xi4 is D or E SEQ Description Amino acid sequence
  • Xi is Q or pE (pyroglutamate )
  • X 2 is M or L
  • X 3 is V or K
  • X 4 is K or V
  • Xs is M or I
  • Xe is I or M
  • X 7 is A or R
  • X 8 is T or S
  • Xg is S or N
  • X10 is M or L
  • X11 is E or Q
  • X12 is T or R
  • Xl3 is K or R
  • Xl4 is D or E
  • Xi is Q or pE (pyroglutamate )
  • X 2 is M or L
  • Xs is V or K
  • x 4 is K or V
  • Xs is K or T
  • Xe is M or I
  • X 7 is I or M
  • Xs is A or R
  • Xg is T or S
  • X10 is S or N
  • X11 is M or L
  • X12 is E or Q
  • Xl3 is T or R
  • Xl4 is K or R
  • Xl5 is D or E
  • Xi is V or L
  • X 2 is S or T
  • X 3 is Y or F
  • x 4 is A or S
  • Xs is L or W
  • Xe is I or V
  • X 7 is D or S
  • Xs is F or Y SEQ Description Amino acid sequence
  • Xi is E or pE pyroglutamate
  • X 2 is V or L
  • Xs is S or T
  • X 4 is Y or F
  • Xs is A or S
  • Xe is L or W
  • X 7 is I or V
  • Xs is D or S
  • Xg is F or Y
  • VL CDRL1 CDRL2 CDRL3 (SEQ ID NO:) (SEQ ID NO:) (SEQ ID NO:) (SEQ ID NO:)
  • VL SVSSSISSSNLY (102) GTSNLAS (104) QQWSSYPFT (105)
  • the heavy chain framework regions described in Table 4 are determined based upon the boundaries of the Kabat numbering system for CDRs.
  • the VH CDRs are determined by Kabat and the framework regions are the amino acid residues surrounding the CDRs in the variable region in the format FRl, CDRl, FR2, CDR2, FR3, CDR3, and FR4.
  • Table 5 Light chain framework (FR) amino acid sequences of exemplary anti-LAG-3
  • the light chain framework regions described in Table 5 are determined based upon the boundaries of the Kabat numbering system for CDRs.
  • the VL CDRs are determined by Kabat and the framework regions are the amino acid residues surrounding the CDRs in the variable region in the format FRl, CDRl, FR2, CDR2, FR3, CDR3, and FR4.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a VH domain comprising one, two, or all three of the CDRs of a VH domain set forth in Tables 1, 2, 6, and 7 herein.
  • the antibody comprises the CDRH 1 of one of the VH domains set forth in Tables 1, 2, 6, and 7.
  • the antibody comprises the CDRH2 of one of the VH domains set forth in Tables 1, 2, 6, and 7.
  • the antibody comprises the CDRH3 of one of the VH domains set forth in Tables 1, 2, 6, and 7.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a VL domain comprising one, two, or all three of the CDRs of a VL domain disclosed in Tables 1, 3, 6, and 7 herein.
  • the antibody comprises the CDRL 1 of one of the VL domains set forth in Tables 1, 3, 6, and 7.
  • the antibody comprises the CDRL2 of one of the VL domains set forth in Tables 1, 3, 6, and 7.
  • the antibody comprises the CDRL3 of one of the VL domains set forth in Tables 1, 3, 6, and 7.
  • the CDRs of an antibody can be determined according to Kabat et al, J. Biol. Chem. 252, 6609-6616 ( 1977) and Kabat et al, Sequences of protein of immunological interest (1991), each of which is herein incorporated by reference in its entirety.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising the Kabat VH CDRs of a VH disclosed in Tables 1, 6, and 7 herein.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG- 3), the antibody comprising the Kabat VL CDRs of a VL disclosed in Tables 1, 6, and 7 herein.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising the Kabat VH CDRs and Kabat VL CDRs of an antibody disclosed in Tables 1, 6, and 7 herein.
  • the CDRs of an antibody can be determined according to the Chothia numbering scheme, which refers to the location of immunoglobulin structural loops (see, e.g. , Chothia C & Lesk AM, ( 1987), J Mol Biol 196: 901-917; Al-Lazikani B et al , (1997) J Mol Biol 273 : 927-948; Chothia C et al , (1992) J Mol Biol 227: 799-817; Tramontano A et al , (1990) J Mol Biol 215( 1): 175-82; and U. S. Patent No. 7,709,226, all of which are herein incorporated by reference in their entireties).
  • the Chothia CDRH 1 loop is present at heavy chain amino acids 26 to 32, 33, or 34
  • the Chothia CDRH2 loop is present at heavy chain amino acids 52 to 56
  • the Chothia CDRH3 loop is present at heavy chain amino acids 95 to 102
  • the Chothia CDRL l loop is present at light chain amino acids 24 to 34
  • the Chothia CDRL2 loop is present at light chain amino acids 50 to 56
  • the Chothia CDRL3 loop is present at light chain amino acids 89 to 97.
  • the end of the Chothia CDRH 1 loop when numbered using the Kabat numbering convention varies between H32 and H34 depending on the length of the loop (this is because the Kabat numbering scheme places the insertions at H35A and H35B; if neither 35A nor 35B is present, the loop ends at 32; if only 35A is present, the loop ends at 33; if both 35A and 35B are present, the loop ends at 34).
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising the Chothia VH CDRs of a VH disclosed in Tables 1, 6, and 7 herein.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG- 3), the antibody comprising the Chothia VL CDRs of a VL disclosed in Tables 1, 6, and 7 herein.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g.
  • antibodies that specifically bind to LAG-3 comprise one or more CDRs, in which the Chothia and Kabat CDRs have the same amino acid sequence.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3) and comprises combinations of Kabat CDRs and Chothia CDRs.
  • the CDRs of an antibody can be determined according to the IMGT numbering system as described in Lefranc M-P, (1999) The Immunologist 7: 132- 136 and Lefranc M-P et al , (1999) Nucleic Acids Res 27: 209-212, each of which is herein incorporated by reference in its entirety.
  • CDRHl is at positions 26 to 35
  • CDRH2 is at positions 51 to 57
  • CDRH3 is at positions 93 to 102
  • CDRL1 is at positions 27 to 32
  • CDRL2 is at positions 50 to 52
  • CDRL3 is at positions 89 to 97.
  • the instant disclosure provides antibodies that specifically bind to LAG-3 (e.g., human LAG-3) and comprise CDRs of an antibody disclosed in Tables 1, 6, and 7 herein, as determined by the IMGT numbering system, for example, as described in Lefranc M-P (1999) supra and Lefranc M-P et al , (1999) supra.
  • LAG-3 e.g., human LAG-3
  • CDRs of an antibody disclosed in Tables 1, 6, and 7 herein as determined by the IMGT numbering system, for example, as described in Lefranc M-P (1999) supra and Lefranc M-P et al , (1999) supra.
  • the CDRs of an antibody can be determined according to the AbM numbering scheme, which refers to AbM hypervariable regions, which represent a compromise between the Kabat CDRs and Chothia structural loops, and are used by Oxford Molecular's AbM antibody modeling software (Oxford Molecular Group, Inc.).
  • the instant disclosure provides antibodies that specifically bind to LAG-3 (e.g. , human LAG-3) and comprise CDRs of an antibody disclosed in Tables 1, 6, and 7 herein as determined by the AbM numbering scheme.
  • the CDRs of an antibody can be determined according to MacCallum RM et al, (1996) J Mol Biol 262: 732-745, which is herein incorporated by reference in its entirety. See also, e.g., Martin A. "Protein Sequence and Structure Analysis of Antibody Variable Domains," in Antibody Engineering, Kontermann and Diibel, eds., Chapter 31, pp. 422-439, Springer- Verlag, Berlin (2001), which is herein incorporated by reference in its entirety.
  • the instant disclosure provides antibodies that specifically bind to LAG-3 (e.g. , human LAG-3) and comprise CDRs of an antibody disclosed in Tables 1, 6, and 7 herein as described in MacCallum RM et al , (1996) supra.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), wherein the antibody comprises a heavy chain variable region comprising the CDRH1, CDRH2, and CDRH3 region amino acid sequences of a VH domain set forth in SEQ ID NO: 1, 3, 5, 7, 9, 11, 13, 14, 15, 17, 19, 20, 22, 24, 27, 29, 31, 33, 35, 36, 38, 39, 42, 45, 46, 48, 51, 53, 54, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, or 72, and a light chain variable region comprising the CDRL1, CDRL2, and CDRL3 region amino acid sequences of a VL domain set forth in SEQ ID NO: 2, 4, 6, 8, 10, 12, 16, 18, 21, 23, 25, 26, 28, 30, 32, 34, 37, 40, 41, 43, 44, 47, 49, 50, 52, 55, 73, 74, 75,
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising:
  • a CDRH1 comprises the amino acid sequence of DXiYX 2 X 3 (SEQ ID NO: 140), wherein X 2 is I or M, and
  • a CDRH2 comprises the amino acid sequence of X1IDPANX2X3X4X5X6X7PX8X9QX10 (SEQ ID NO: 142), wherein
  • X 2 is D or G
  • X 3 is N or H
  • X 4 is T or S
  • X 5 is K or H
  • X6 is Y or F
  • X 7 is D or A
  • Xs is K or R
  • X 10 is G or D;
  • a CDRH3 comprises the amino acid sequence of YX 1 X 2 X 3 YX 4 VGGX 5 DY (SEQ ID NO: 144), wherein
  • X 2 is Y or D
  • X 3 is K or R
  • X 4 is D or E
  • a CDRL1 comprises the amino acid sequence of SVSSX1ISSSX2LX3 (SEQ ID NO: 147), wherein X 2 is N or T, and
  • a CDRL2 comprises the amino acid sequence of GTSNLAS (SEQ ID NO: 104); and/or
  • a CDRL3 comprises the amino acid sequence of QQWXiX 2 YPX 3 T (SEQ ID NO:
  • X 2 is S, T or R
  • X 3 is F, L, H, or W.
  • CDRH1 comprises the amino acid sequence of DX 1 YX 2 X 3 (SEQ ID NO: 141), wherein: Xj is T or N; X 2 is I or M; and X 3 is H or Y.
  • CDRH2 comprises the amino acid sequence of X 1 IDPANX 2 X3X 4 KX5X6PX7FQX8 (SEQ ID NO: 143), wherein: Xj is E, R, or S; X 2 is D or G; X3 is N or H; X 4 is T or S; X5 is Y or F; X 6 is D or A; X 7 is K or R; and Xg is G or D.
  • CDRH3 comprises the amino acid sequence of YX 1 X 2 X 3 YDVGGX 4 DY (SEQ ID NO: 145), wherein: Xj is Y, F, or S; X 2 is Y or D; X 3 is K or R; and X4 is F or C.
  • CDRH3 comprises the amino acid sequence of YYYX 1 YX 2 VGGFDY (SEQ ID NO: 146), wherein: Xj is K or R; and X 2 is D or E.
  • CDRL1 comprises the amino acid sequence of SVSSSISSSNLXi (SEQ ID NO: 148), wherein: Xi is H or Y.
  • CDRL3 comprises the amino acid sequence of QQWXjSYPXiT (SEQ ID NO: 150), wherein: Xi is S, N, or R; and X 2 is F, L, or H.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising:
  • a CDRH 1 comprises the amino acid sequence of DTYIH (SEQ ID NO: 79);
  • a CDRH2 comprises the amino acid sequence of EIDPANDNTKYDPKFQG (SEQ ID NO: 90); and/or
  • a CDRH3 comprises the amino acid sequence of YYYXiYX 2 VGGFDY (SEQ ID NO: 146), wherein: Xi is K or R; and X 2 is D or E; and/or
  • a CDRL 1 comprises the amino acid sequence of SVSSSISSSNLH (SEQ ID NO: 100); and/or
  • a CDRL2 comprises the amino acid sequence of GTSNLAS (SEQ ID NO: 104); and/or
  • a CDRL3 comprises the amino acid sequence of QQWSSYPFT (SEQ ID NO: 105).
  • CDRH l comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 78-82.
  • CDRH2 comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 83-93.
  • CDRH3 comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 94-99.
  • CDRL 1 comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 100- 103.
  • CDRL3 comprises an amino acid sequence selected from the group consisting of SEQ ID NOs: 105- 112.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), wherein the antibody comprises a VH domain comprising the CDRH l, CDRH2 and CDRH3 amino acid sequences set forth in SEQ ID NOs: 78, 83, and 94; 78, 85, and 95; 78, 86, and 96; 78, 86, and 97; 78, 91, and 94; 78, 92, and 96; 79, 84, and 95; 79, 88, and 95; 79, 89, and 95; 79, 90, and 95; 79, 90, and 98; 79, 90, and 99; 80, 85, and 96; 81, 87, and 96; or, 82, 93, and 95, respectively.
  • LAG-3 e.g. , human LAG-3
  • the antibody comprises a VH domain comprising the CDRH l, CDRH2 and CDRH3
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), wherein the antibody comprises a VH domain comprising the CDRH l, CDRH2 and CDRH3 amino acid sequences set forth in SEQ ID NOs: 79, 90, and 95, respectively.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), wherein the antibody comprises a VH domain comprising the CDRH l, CDRH2 and CDRH3 amino acid sequences set forth in SEQ ID NOs: 79, 90, and 98, respectively.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), wherein the antibody comprises a VL domain comprising the CDRL 1, CDRL2 and CDRL3 amino acid sequences set forth in SEQ ID NOs: 100, 104, and 105; 100, 104, and 106; 100, 104, and 107; 100, 104, and 109; 100, 104, and 1 10; 101, 104, and 108; 102, 104, and 105; 102, 104, and 1 12; or, 103, 104, and 1 1 1, respectively.
  • LAG-3 e.g. , human LAG-3
  • the antibody comprises a VL domain comprising the CDRL 1, CDRL2 and CDRL3 amino acid sequences set forth in SEQ ID NOs: 100, 104, and 105; 100, 104, and 106; 100, 104, and 107; 100, 104, and 109; 100, 104, and 1 10; 101, 104,
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), wherein the antibody comprises a VL domain comprising the CDRL1, CDRL2 and CDRL3 amino acid sequences set forth in SEQ ID NOs: 100, 104, and 105, respectively.
  • LAG-3 e.g., human LAG-3
  • the antibody comprises a VL domain comprising the CDRL1, CDRL2 and CDRL3 amino acid sequences set forth in SEQ ID NOs: 100, 104, and 105, respectively.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), wherein the antibody comprises a heavy chain variable region comprising CDRH l, CDRH2, and CDRH3 regions, and a light chain variable region comprising CDRL 1, CDRL2, and CDRL3 regions, wherein the CDRH l, CDRH2, CDRH3, CDRL l, CDRL2, and CDRL3 regions comprise the amino acid sequences set forth in SEQ ID NOs: 78, 83, 94, 100, 104, and 105; 78, 85, 95, 100, 104, and 105; 78, 86, 96, 100, 104, and 105; 78, 86, 96, 100, 104, and 109; 78, 86, 96, 100, 104, and 1 10; 78, 86, 96, 101, 104, and 108; 78, 86, 96, 103, 104, and 1
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g.
  • the antibody comprises a heavy chain variable region comprising CDRH l, CDRH2, and CDRH3 regions, and a light chain variable region comprising CDRL l, CDRL2, and CDRL3 regions, wherein the CDRH l, CDRH2, CDRH3, CDRLl, CDRL2, and CDRL3 regions comprise the amino acid sequences set forth in SEQ ID NOs: 79, 90, 95, 100, 104, and 105, respectively.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g.
  • human LAG-3 human LAG-3
  • the antibody comprises a heavy chain variable region comprising CDRH l, CDRH2, and CDRH3 regions, and a light chain variable region comprising CDRL l, CDRL2, and CDRL3 regions, wherein the CDRH l, CDRH2, CDRH3, CDRL l, CDRL2, and CDRL3 regions comprise the amino acid sequences set forth in SEQ ID NOs: 79, 90, 98, 100, 104, and 105, respectively.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), wherein the antibody comprises a heavy chain variable region (VH) comprising one, two or all three of the VH CDRs of an antibody in Tables 1, 2, 6, and 7.
  • VH heavy chain variable region
  • the antibody comprises one, two, three or all four of the VH framework regions described herein.
  • the antibody comprises one, two, three or all four of the VH framework regions (FRs) set forth in Table 4 (e.g. , one, two, three, or four of the framework regions in one row in Table 4).
  • the antibody comprises one, two, three or all four of the framework regions of the heavy chain variable region sequence of SEQ ID NO: 151 or 222. In certain embodiments, the antibody comprises one, two, three or all four of the framework regions of the heavy chain variable region sequence of SEQ ID NO: 218 or 223. In certain embodiments, the antibody comprises one, two, three or four of the framework regions of a heavy chain variable region sequence which is at least 75%, 80%, 85%, 90%, 95%, or 100% (e.g.
  • the antibody comprises a heavy chain variable framework region that is or is derived from an amino acid sequence encoded by a human gene, wherein the amino acid sequence is selected from the group consisting of IGHV 1-46 (e.g. , IGHV 1-46*01, e.g. , having the amino acid sequence of SEQ ID NO: 153), IGHV 1-69-2 (e.g.
  • IGHV 1-69-2*01 e.g. , having the amino acid sequence of SEQ ID NO: 154
  • IGHV 1-3 e.g. , IGHV 1-3*01, e.g. , having the amino acid sequence of SEQ ID NO: 155
  • IGHV 1-24 e.g. , IGHV 1-24*01, e.g. , having the amino acid sequence of SEQ ID NO: 156
  • IGHV 1-2 e.g. , IGHV 1-2*01, e.g. , having the amino acid sequence of SEQ ID NO: 157
  • IGHV 1-45 e.g. , IGHV 1-45*01, e.g.
  • the heavy chain variable framework region that is derived from said amino acid sequence consists of said amino acid sequence but for the presence of up to 20 amino acid substitutions, deletions, and/or insertions, preferably up to 20 amino acid substitutions.
  • the heavy chain variable framework region that is derived from said amino acid sequence consists of said amino acid sequence with 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1 1, 12, 13, 14, 15, 16, 17, 18, 19, or 20 amino acid residues being substituted for an amino acid found in an analogous position in a corresponding non-human heavy chain variable framework region.
  • the antibody comprises a heavy chain variable framework region that is derived from the amino acid sequence of SEQ ID NO: 153), wherein at least one amino acid in the amino acid sequence of SEQ ID NO: 153 is substituted with an amino acid in an analogous position in a corresponding non-human heavy chain variable framework region.
  • the amino acid substitution is at an amino acid position selected from the group consisting of 4, 5, 12, 23, 27, 28, 29, 30, 48, 69, 71, 75, 76, 80, 81, and 94, wherein the amino acid position is indicated according to the Kabat numbering system.
  • the amino acid substitution is selected from the group consisting of 4M, 5K, 12V, 23T, 27F, 28N, 291, 30K, 481, 691, 71A, 75S, 76N, 80L, 81Q, and 94T, wherein the position of the amino acid substitution is indicated according to the Kabat numbering system.
  • the amino acid substitution is at an amino acid position selected from the group consisting of 4, 27, 28, 29, 30, 69, 71, and 94, wherein the amino acid position is indicated according to the Kabat numbering system.
  • the amino acid substitution is selected from the group consisting of 4M, 27F, 28N, 291, 30K, 691, 71A, and 94T, wherein the position of the amino acid substitution is indicated according to the Kabat numbering system.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), wherein the antibody comprises a light chain variable region (VH) comprising one, two or all three of the VL CDRs of an antibody in Tables 1, 3, 6, and 7.
  • VH light chain variable region
  • the antibody comprises one, two, three or all four of the VL framework regions described herein.
  • the antibody comprises one, two, three or all four of the VL framework regions (FRs) set forth in Table 5 (e.g. , one, two, three, or four of the framework regions in one row in Table 5).
  • the antibody comprises one, two, three or all four of the framework regions of the light chain variable region sequence of SEQ ID NO: 152 or 224. In certain embodiments, the antibody comprises one, two, three or four of the framework regions of a light chain variable region sequence which is at least 75%, 80%, 85%, 90%, 95%, or 100% (e.g., at least 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98 or 99%) identical to one, two, three or four of the framework regions of a light chain variable region sequence selected from the group consisting of SEQ ID NOs: 73-77.
  • the antibody comprises a light chain variable framework region that is or is derived from an amino acid sequence encoded by a human gene, wherein the amino acid sequence is selected from the group consisting of IGKV3-20 (e.g. , IGKV3-20*01, e.g., having the amino acid sequence of SEQ ID NO: 160), IGKV3D- 15 (e.g., IGKV3D- 15*01, e.g., having the amino acid sequence of SEQ ID NO: 161), IGKV3- 15 (e.g., IGKV3- 15*01, e.g. , having the amino acid sequence of SEQ ID NO: 161), IGKV3D-20 (e.g.
  • IGKV3D-20*01 e.g. , having the amino acid sequence of SEQ ID NO: 162
  • IGKV3D-7 e.g. , IGKV3D-7*01, e.g., having the amino acid sequence of SEQ ID NO: 163
  • IGKV 1-9 e.g. , IGKV 1-9*01, e.g., having the amino acid sequence of SEQ ID NO: 164
  • IGKV3- 1 1 e.g. , IGKV3- 1 *01, e.g., having the amino acid sequence of SEQ ID NO: 165).
  • the light chain variable framework region that is derived from said amino acid sequence consists of said amino acid sequence but for the presence of up to 20 amino acid substitutions, deletions, and/or insertions, preferably up to 20 amino acid substitutions.
  • the light chain variable framework region that is derived from said amino acid sequence consists of said amino acid sequence with 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 1 1, 12, 13, 14, 15, 16, 17, 18, 19, or 20 amino acid residues being substituted for an amino acid found in an analogous position in a corresponding non- human light chain variable framework region.
  • the antibody comprises a light chain variable framework region that is derived from the amino acid sequence of SEQ ID NO: 160, wherein at least one amino acid in the amino acid sequence of SEQ ID NO: 160 is substituted with an amino acid in an analogous position in a corresponding non-human light chain variable framework region.
  • the amino acid substitution is at an amino acid position selected from the group consisting of 3, 22, 36, 43, 47, 58, 70, and 71, wherein the amino acid position is indicated according to the Kabat numbering system.
  • the amino acid substitution is selected from the group consisting of 3L, 22T, 36F, 43S, 47W, 58V, 70S, and 71Y, wherein the position of the amino acid substitution is indicated according to the Kabat numbering system.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), wherein the antibody comprises a heavy chain variable region (VH) comprising one, two or all three of the VH CDRs of an antibody in Tables 1, 2, 6, and 7 (e.g. , the VH CDRs in one row of Table 2) and a light chain variable region (VL) comprising one, two or all three of the VL CDRs of an antibody in Tables 1, 3, 6, and 7 (e.g. , the VL CDRs in one row of Table 3).
  • the antibody comprises the VH framework regions and the VL framework regions described herein.
  • the antibody comprises the VH framework regions (FRs) set forth in Table 4 (e.g. , one, two, three, or four of the framework regions in one row in Table 4) and the VL framework regions (FRs) set forth in Table 5 (e.g. , one, two, three, or four of the framework regions in one row in Table 5).
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), wherein the antibody comprises a VH domain comprising the CDRH l, CDRH2 and CDRH3 amino acid sequences set forth in SEQ ID NOs: 79, 90, and 95 ; or 79, 90, and 98, respectively.
  • the antibody comprises one, two, three or all four VH framework regions derived from the VH of a human or primate antibody.
  • the antibody comprises VH framework regions of an antibody set forth in Table 4.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), wherein the antibody comprises a VL domain comprising the CDRL 1, CDRL2 and CDRL3 amino acid sequences set forth in SEQ ID NOs: 100, 104, and 105, respectively.
  • the antibody comprises one, two, three or all four VL framework regions derived from the VL of a human or primate antibody.
  • the antibody comprises VL framework regions of an antibody set forth in Table 5.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), wherein the antibody comprises a heavy chain variable region comprising CDRH l, CDRH2, and CDRH3 regions, and a light chain variable region comprising CDRL 1, CDRL2, and CDRL3 regions, wherein the CDRH l, CDRH2, CDRH3, CDRL l, CDRL2, and CDRL3 regions comprise the amino acid sequences set forth in SEQ ID NOs: 79, 90, 95, 100, 104, and 105; or 79, 90, 98, 100, 104, and 105, respectively.
  • LAG-3 e.g., human LAG-3
  • the antibody comprises one, two, three or all four VH framework regions derived from the VH of a human or primate antibody and one, two, three or all four VL framework regions derived from the VL of a human or primate antibody. In some embodiments, the antibody comprises VH framework regions and VL framework regions of an antibody set forth in Tables 4 and 5, respectively.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), comprising a heavy chain variable region comprising an amino acid sequence of SEQ ID NO: 151 or 222.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), comprising a heavy chain variable region comprising an amino acid sequence of SEQ ID NO: 218 or 223.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), comprising a heavy chain variable region comprising an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, or 100% (e.g., at least 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98 or 99%) identical to the amino acid sequence set forth in SEQ ID NO: 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 220, 66, 67, 68, 69, 70, 71, or 72.
  • LAG-3 e.g., human LAG-3
  • a heavy chain variable region comprising an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, or 100% (e.g., at least 86, 87, 88, 89, 90, 91, 92, 93, 94
  • the antibody comprises a heavy chain variable region having the amino acid sequence set forth in SEQ ID NO: 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 220, 66, 67, 68, 69, 70, 71, or 72, optionally wherein the amino acid residue at position 1 of the heavy chain variable region has been converted to pyroglutamate.
  • the antibody comprises a heavy chain variable region having the amino acid sequence set forth in SEQ ID NO: 65.
  • the antibody comprises a heavy chain variable region having the amino acid sequence set forth in SEQ ID NO: 220.
  • the X in SEQ ID NO: 220 is Q.
  • the X in SEQ ID NO: 220 is pyroglutamate.
  • the antibody comprises a heavy chain having the amino acid sequence set forth in SEQ ID NO: 168, 225, 169, 226, 170, 227, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, or 186, optionally wherein the amino acid residue at position 1 of the heavy chain has been converted to pyroglutamate.
  • the antibody comprises a heavy chain having the amino acid sequence set forth in SEQ ID NO: 168.
  • the antibody comprises a heavy chain having the amino acid sequence set forth in SEQ ID NO: 225.
  • the X in SEQ ID NO: 225 is Q. In certain embodiments, the X in SEQ ID NO: 225 is pyroglutamate. In certain embodiments, the antibody comprises a heavy chain having the amino acid sequence set forth in SEQ ID NO: 169. In certain embodiments, the antibody comprises a heavy chain having the amino acid sequence set forth in SEQ ID NO: 226. In certain embodiments, the X in SEQ ID NO: 226 is Q. In certain embodiments, the X in SEQ ID NO: 226 is pyroglutamate. In certain embodiments, the antibody comprises a heavy chain having the amino acid sequence set forth in SEQ ID NO: 170.
  • the antibody comprises a heavy chain having the amino acid sequence set forth in SEQ ID NO: 227.
  • the X in SEQ ID NO: 227 is Q.
  • the X in SEQ ID NO: 227 is pyroglutamate.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), comprising a light chain variable region comprising an amino acid sequence of SEQ ID NO: 152 or 224.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), comprising a light chain variable region comprising an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, or 100% (e.g., at least 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98 or 99%) identical to the amino acid sequence set forth in SEQ ID NO: 73, 74, 75, 76, or 77.
  • the antibody comprises a light chain variable region having the amino acid sequence set forth in SEQ ID NO: 73, 74, 75, 76, or 77, optionally wherein the amino acid residue at position 1 of the light chain variable region has been converted to pyroglutamate.
  • the antibody comprises a light chain variable region having the amino acid sequence set forth in SEQ ID NO: 73.
  • the antibody comprises a light chain variable region having the amino acid sequence set forth in SEQ ID NO: 221.
  • the X in SEQ ID NO: 221 is E.
  • the X in SEQ ID NO: 221 is pyroglutamate.
  • the antibody comprises a light chain variable region having the amino acid sequence set forth in SEQ ID NO: 187, 188, 189, 190, or 191, optionally wherein the amino acid residue at position 1 of the light chain has been converted to pyroglutamate.
  • the antibody comprises a light chain variable region having the amino acid sequence set forth in SEQ ID NO: 187.
  • the antibody comprises a light chain variable region having the amino acid sequence set forth in SEQ ID NO: 228.
  • the X in SEQ ID NO: 228 is E.
  • the X in SEQ ID NO: 228 is pyroglutamate.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), comprising a heavy chain variable region comprising an amino acid sequence of SEQ ID NO: 151 or 222, and a light chain variable region comprising an amino acid sequence of SEQ ID NO: 152 or 224.
  • LAG-3 e.g. , human LAG-3
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), comprising a heavy chain variable region comprising an amino acid sequence of SEQ ID NO: 218 or 223, and a light chain variable region comprising an amino acid sequence of SEQ ID NO: 152 or 224.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG- 3), comprising a heavy chain variable region comprising an amino acid sequence that is at least 75%, 80%, 85%, 90%, 95%, or 100% (e.g.
  • the antibody comprises a heavy chain variable region having the amino acid sequence set forth in SEQ ID NO: 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 220, 66, 67, 68, 69, 70, 71, or 72, and a light chain variable region having the amino acid sequence set forth in SEQ ID NO: 73, 221, 74, 75, 76, or 77.
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 56 and 73; 56 and 74; 56 and 75; 56 and 76; 56 and 77; 57 and 73; 57 and 74; 57 and 75; 57 and 76; 57 and 77; 58 and 73; 58 and 74; 58 and 75; 58 and 76; 58 and 77; 59 and 73; 59 and 74; 59 and 75; 59 and 76; 59 and 77; 60 and 73; 60 and 74; 60 and 75; 60 and 76; 60 and 77; 61 and 77; 62 and 77; 63 and 73; 64 and 73; 65 and 73; 220 and 73; 65 and 221; 220 and 221; 66 and 73; 67 and 73; 68 and 73; 69 and 73; 70 and 73; 71 and 73; or 72 and 73, respectively
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 56 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 220 and 221, respectively.
  • the X in SEQ ID NO: 220 is Q. In certain embodiments, the X in SEQ ID NO: 220 is pyroglutamate. In certain embodiments, the X in SEQ ID NO: 221 is E. In certain embodiments, the X in SEQ ID NO: 221 is pyroglutamate.
  • the X in SEQ ID NO: 220 is Q, and the X in SEQ ID NO: 221 is E. In certain embodiments, the X in SEQ ID NO: 220 is Q, and the X in SEQ ID NO: 221 is pyroglutamate. In certain embodiments, the X in SEQ ID NO: 220 is pyroglutamate, and the X in SEQ ID NO: 221 is E. In certain embodiments, the X in SEQ ID NO: 220 is pyroglutamate, and the X in SEQ ID NO: 221 is pyroglutamate.
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 56 and 74, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 56 and 75, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 56 and 76, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 56 and 77, respectively.
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 57 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 57 and 74, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 57 and 75, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 57 and 76, respectively.
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 57 and 77, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 58 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 58 and 74, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 58 and 75, respectively.
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 58 and 76, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 58 and 77, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 59 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 59 and 74, respectively.
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 59 and 75, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 59 and 76, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 59 and 77, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 60 and 73, respectively.
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 60 and 74, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 60 and 75, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 60 and 76, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 60 and 77, respectively.
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 61 and 77, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 62 and 77, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 63 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 64 and 73, respectively.
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 65 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 66 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 67 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 68 and 73, respectively.
  • the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 69 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 70 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 71 and 73, respectively. In certain embodiments, the antibody comprises a heavy chain variable region and light chain variable region having the amino acid sequences set forth in SEQ ID NO: 72 and 73, respectively. In certain embodiments, the amino acid residue at position 1 of the heavy chain variable region has been converted to pyroglutamate.
  • the amino acid residue at position 1 of the light chain variable region has been converted to pyroglutamate. In certain embodiments, the amino acid residue at position 1 of the heavy chain variable region has been converted to pyroglutamate, and the amino acid residue at position 1 of the light chain variable region has been converted to pyroglutamate.
  • the instant disclosure provides an isolated antibody that cross-competes for binding to LAG-3 (e.g. , human LAG-3) with an antibody comprising the heavy and light chain variable region amino acid sequences set forth in SEQ ID NOs: 1 and 2; 3 and 4; 5 and 6; 7 and 8; 9 and 10; 1 1 and 12; 13 and 10; 14 and 10; 15 and 16; 17 and 18; 19 and 8; 20 and 21 ; 22 and 23; 24 and 10; 9 and 25; 9 and 26; 20 and 2; 27 and 28; 29 and 30; 31 and 32; 33 and 34; 35 and 10; 36 and 37; 38 and 21 ; 39 and 40; 9 and 2; 9 and 41 ; 42 and 43; 9 and 44; 45 and 32; 46 and 47; 48 and 10; 20 and 49; 33 and 50; 51 and 52; 53 and 8; 38 and 2; or 54 and 55, respectively.
  • LAG-3 e.g. , human LAG-3
  • an antibody comprising the heavy and light chain variable region amino acid sequences set forth in SEQ ID
  • the instant disclosure provides an isolated antibody that cross-competes for binding to LAG-3 (e.g. , human LAG-3) with an antibody comprising the heavy and light chain variable region amino acid sequences set forth in SEQ ID NOs: 56 and 73; 56 and 74; 56 and 75; 56 and 76; 56 and 77; 57 and 73; 57 and 74; 57 and 75; 57 and 76; 57 and 77; 58 and 73; 58 and 74; 58 and 75; 58 and 76; 58 and 77; 59 and 73; 59 and 74; 59 and 75; 59 and 76; 59 and 77; 60 and 73; 60 and 74; 60 and 75; 60 and 76; 60 and 77; 61 and 77; 62 and 77; 63 and 73; 64 and 73; 65 and 73; 220 and 73; 65 and 221 ; 220 and 221 ; 66 and 73; 67 and 73;
  • the instant disclosure provides an isolated antibody that binds to the same or an overlapping epitope of LAG-3 (e.g., an epitope of human LAG-3) as an antibody described herein, e.g., an antibody comprising the heavy and light chain variable region amino acid sequences set forth in SEQ ID NOs: 1 and 2; 3 and 4; 5 and 6; 7 and 8; 9 and 10; 1 1 and 12; 13 and 10; 14 and 10; 15 and 16; 17 and 18; 19 and 8; 20 and 21 ; 22 and 23; 24 and 10; 9 and 25; 9 and 26; 20 and 2; 27 and 28; 29 and 30; 31 and 32; 33 and 34; 35 and 10; 36 and 37; 38 and 21 ; 39 and 40; 9 and 2; 9 and 41 ; 42 and 43; 9 and 44; 45 and 32; 46 and 47; 48 and 10; 20 and 49; 33 and 50; 51 and 52; 53 and 8; 38 and 2; or 54 and 55, respectively.
  • LAG-3 e.g., an epitope of human
  • the instant disclosure provides an isolated antibody that binds to the same or an overlapping epitope of LAG-3 (e.g. , an epitope of human LAG- 3) as an antibody described herein, e.g. , an antibody comprising the heavy and light chain variable region amino acid sequences set forth in SEQ ID NOs: 56 and 73; 56 and 74; 56 and 75; 56 and 76; 56 and 77; 57 and 73; 57 and 74; 57 and 75; 57 and 76; 57 and 77; 58 and 73; 58 and 74; 58 and 75; 58 and 76; 58 and 77; 59 and 73; 59 and 74; 59 and 75; 59 and 76; 59 and 77; 60 and 73; 60 and 74; 60 and 75; 60 and 76; 60 and 77; 61 and 77; 62 and 77; 63 and 73; 64 and 73; 65 and 73; 220 and 73;
  • the epitope of an antibody can be determined by, e.g. , NMR spectroscopy, surface plasmon resonance (BIAcore®), X-ray diffraction crystallography studies, ELISA assays, hydrogen/deuterium exchange coupled with mass spectrometry (e.g. , liquid chromatography electrospray mass spectrometry), array-based oligo-peptide scanning assays, and/or mutagenesis mapping (e.g. , site-directed mutagenesis mapping).
  • mass spectrometry e.g. , liquid chromatography electrospray mass spectrometry
  • array-based oligo-peptide scanning assays e.g. , site-directed mutagenesis mapping
  • mutagenesis mapping e.g. , site-directed mutagenesis mapping
  • Antibody antigen crystals may be studied using well known X-ray diffraction techniques and may be refined using computer software such as X-PLOR (Yale University, 1992, distributed by Molecular Simulations, Inc.; see, e.g.
  • the epitope of an antibody is determined using alanine scanning mutagenesis studies.
  • antibodies that recognize and bind to the same or overlapping epitopes of LAG-3 can be identified using routine techniques such as an immunoassay, for example, by showing the ability of one antibody to block the binding of another antibody to a target antigen, i.e. , a competitive binding assay.
  • Competition binding assays also can be used to determine whether two antibodies have similar binding specificity for an epitope.
  • such an assay involves the use of purified antigen (e.g. , LAG-3 such as human LAG-3) bound to a solid surface or cells bearing either of these, an unlabeled test immunoglobulin and a labeled reference immunoglobulin.
  • a test immunoglobulin is present in excess.
  • a competing antibody is present in excess, it will inhibit specific binding of a reference antibody to a common antigen by at least 50-55%, 55-60%, 60-65%, 65-70%, 70- 75% or more.
  • a competition binding assay can be configured in a large number of different formats using either labeled antigen or labeled antibody.
  • the antigen is immobilized on a 96-well plate.
  • the ability of unlabeled antibodies to block the binding of labeled antibodies to the antigen is then measured using radioactive or enzyme labels.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 168, 225, 169, 226, 170, 227, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, or 186, optionally wherein the amino acid residue at position 1 of the heavy chain has been converted to pyroglutamate.
  • the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 168.
  • the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 225.
  • the X in SEQ ID NO: 225 is Q.
  • the X in SEQ ID NO: 225 is pyroglutamate.
  • the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 169.
  • the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 226.
  • the X in SEQ ID NO: 226 is Q.
  • the X in SEQ ID NO: 226 is pyroglutamate.
  • the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 170. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 227. In certain embodiments, the X in SEQ ID NO: 227 is Q. In certain embodiments, the X in SEQ ID NO: 227 is pyroglutamate. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 171. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 172. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 173.
  • the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 174. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 175. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 176. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 177. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 178. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 179.
  • the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 180. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 181. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 182. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 183. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 184. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 185. In certain embodiments, the antibody comprises a heavy chain comprising the amino acid sequence set forth in SEQ ID NO: 186. In certain embodiments, the amino acid residue at position 1 of the heavy chain has been converted to pyroglutamate.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a light chain comprising the amino acid sequence set forth in SEQ ID NO: 187, 228, 188, 189, 190, or 191, optionally wherein the amino acid residue at position 1 of the light chain has been converted to pyroglutamate.
  • the antibody comprises a light chain comprising the amino acid sequence set forth in SEQ ID NO: 187.
  • the antibody comprises a light chain comprising the amino acid sequence set forth in SEQ ID NO: 228.
  • the X in SEQ ID NO: 228 is E.
  • the X in SEQ ID NO: 228 is pyroglutamate.
  • the antibody comprises a light chain comprising the amino acid sequence set forth in SEQ ID NO: 188. In certain embodiments, the antibody comprises a light chain comprising the amino acid sequence set forth in SEQ ID NO: 189. In certain embodiments, the antibody comprises a light chain comprising the amino acid sequence set forth in SEQ ID NO: 190. In certain embodiments, the antibody comprises a light chain comprising the amino acid sequence set forth in SEQ ID NO: 191. In certain embodiments, the amino acid residue at position 1 of the light chain has been converted to pyroglutamate.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 168; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 225; and a light chain comprising the amino acid sequence of SEQ ID NO: 228.
  • the X in SEQ ID NO: 225 is Q, and the X in SEQ ID NO: 228 is pyroglutamate. In certain embodiments, the X in SEQ ID NO: 225 is pyroglutamate, and the X in SEQ ID NO: 228 is E. In certain embodiments, the X in SEQ ID NO: 225 is pyroglutamate, and the X in SEQ ID NO: 228 is pyroglutamate.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 169; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 226; and a light chain comprising the amino acid sequence of SEQ ID NO: 228.
  • the X in SEQ ID NO: 226 is Q, and the X in SEQ ID NO: 228 is pyroglutamate. In certain embodiments, the X in SEQ ID NO: 226 is pyroglutamate, and the X in SEQ ID NO: 228 is E. In certain embodiments, the X in SEQ ID NO: 226 is pyroglutamate, and the X in SEQ ID NO: 228 is pyroglutamate.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 170; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 227; and a light chain comprising the amino acid sequence of SEQ ID NO: 228.
  • the X in SEQ ID NO: 227 is Q, and the X in SEQ ID NO: 228 is pyroglutamate. In certain embodiments, the X in SEQ ID NO: 227 is pyroglutamate, and the X in SEQ ID NO: 228 is E. In certain embodiments, the X in SEQ ID NO: 227 is pyroglutamate, and the X in SEQ ID NO: 228 is pyroglutamate.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 171 ; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 172; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 174; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 174; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 176; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 178; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • LAG-3 e.g. , human LAG-3
  • the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 178; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 179; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 180; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 182; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 184; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • LAG-3 e.g., human LAG-3
  • the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 184; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 185; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 186; and a light chain comprising the amino acid sequence of SEQ ID NO: 187.
  • the amino acid residue at position 1 of the heavy chain has been converted to pyroglutamate.
  • the amino acid residue at position 1 of the light chain has been converted to pyroglutamate.
  • the amino acid residue at position 1 of the heavy chain has been converted to pyroglutamate, and the amino acid residue at position 1 of the light chain has been converted to pyroglutamate.
  • Any Ig constant region can be used in the antibodies disclosed herein.
  • the Ig region is a human IgG, IgE, IgM, IgD, IgA, or IgY immunoglobulin molecule, any class (e.g.
  • IgGi IgG 2 , IgG 3 , IgG 4 , IgA 1; and IgA 2
  • any subclass e.g. , IgG 2a and IgG 2 b of immunoglobulin molecule.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain constant region comprising the amino acid sequence of SEQ ID NO: 192, 193, 194, 195, 196, 197, 208, or 209.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a heavy chain constant region comprising the amino acid sequence of SEQ ID NO: 194.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g., human LAG-3), the antibody comprising a light chain constant region comprising the amino acid sequence of SEQ ID NO: 198. In certain embodiments, the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a light chain constant region comprising the amino acid sequence of SEQ ID NO: 219.
  • one, two, or more mutations are introduced into the Fc region of an antibody described herein (e.g., CH2 domain (residues 231-340 of human IgGi) and/or CH3 domain (residues 341-447 of human IgGi) and/or the hinge region, numbered according to the EU numbering system to alter one or more functional properties of the antibody, such as serum half-life, complement fixation, Fc receptor binding and/or antigen-dependent cellular cytotoxicity.
  • an antibody described herein e.g., CH2 domain (residues 231-340 of human IgGi) and/or CH3 domain (residues 341-447 of human IgGi) and/or the hinge region, numbered according to the EU numbering system to alter one or more functional properties of the antibody, such as serum half-life, complement fixation, Fc receptor binding and/or antigen-dependent cellular cytotoxicity.
  • one, two, or more mutations are introduced into the hinge region of the Fc region (CH 1 domain) such that the number of cysteine residues in the hinge region are altered (e.g., increased or decreased) as described in, e.g., U. S. Patent No. 5,677,425.
  • the number of cysteine residues in the hinge region of the CH I domain may be altered to, e.g. , facilitate assembly of the light and heavy chains, or to alter (e.g. , increase or decrease) the stability of the antibody.
  • one, two, or more amino acid mutations are introduced into an IgG constant domain, or FcRn- binding fragment thereof (preferably an Fc or hinge-Fc domain fragment) to alter (e.g. , decrease or increase) half-life of the antibody in vivo.
  • an IgG constant domain, or FcRn- binding fragment thereof preferably an Fc or hinge-Fc domain fragment
  • alter e.g. , decrease or increase
  • half-life of the antibody in vivo See, e.g., International Publication Nos. WO 02/060919; WO 98/23289; and WO 97/34631; and U.S. Patent Nos. 5,869,046, 6,121,022, 6,277,375 and 6,165,745, all of which are herein incorporated by reference in their entireties, for examples of mutations that will alter (e.g.
  • one, two or more amino acid mutations are introduced into an IgG constant domain, or FcRn- binding fragment thereof (preferably an Fc or hinge-Fc domain fragment) to decrease the half-life of the antibody in vivo.
  • one, two or more amino acid mutations are introduced into an IgG constant domain, or FcRn-binding fragment thereof (preferably an Fc or hinge-Fc domain fragment) to increase the half-life of the antibody in vivo.
  • the antibodies may have one or more amino acid mutations (e.g., substitutions) in the second constant (CH2) domain (residues 231-340 of human IgGi) and/or the third constant (CH3) domain (residues 341-447 of human IgGi), numbered according to the EU numbering system.
  • the constant region of the IgGi of an antibody described herein comprises a methionine (M) to tyrosine (Y) substitution in position 252, a serine (S) to threonine (T) substitution in position 254, and a threonine (T) to glutamic acid (E) substitution in position 256, numbered according to the EU numbering system.
  • an antibody comprises an IgG constant domain comprising one, two, three or more amino acid substitutions of amino acid residues at positions 251-257, 285-290, 308-314, 385-389, and 428-436, numbered according to the EU numbering system.
  • one, two, or more mutations are introduced into the Fc region of an antibody described herein (e.g., CH2 domain (residues 231-340 of human IgGi) and/or CH3 domain (residues 341-447 of human IgGi) and/or the hinge region, numbered according to the EU numbering system to increase or decrease the affinity of the antibody for an Fc receptor (e.g. , an activated Fc receptor) on the surface of an effector cell.
  • an Fc receptor e.g. , an activated Fc receptor
  • Mutations in the Fc region of an antibody that decrease or increase the affinity of an antibody for an Fc receptor and techniques for introducing such mutations into the Fc receptor or fragment thereof are known to one of skill in the art. Examples of mutations in the Fc receptor of an antibody that can be made to alter the affinity of the antibody for an Fc receptor are described in, e.g. , Smith P et al , (2012) PNAS 109: 6181-6186, U.S. Patent No. 6,737,056, and International Publication Nos. WO 02/060919; WO 98/23289; and WO 97/34631, all of which are herein incorporated by reference in their entireties.
  • one, two, or more amino acid substitutions are introduced into an IgG constant domain Fc region to alter the effector function(s) of the antibody.
  • one or more amino acids selected from amino acid residues 234, 235, 236, 237, 297, 318, 320 and 322, numbered according to the EU numbering system can be replaced with a different amino acid residue such that the antibody has an altered affinity for an effector ligand but retains the antigen-binding ability of the parent antibody.
  • the effector ligand to which affinity is altered can be, for example, an Fc receptor or the CI component of complement. This approach is described in further detail in U.S. Patent Nos.
  • the deletion or inactivation (through point mutations or other means) of a constant region domain may reduce Fc receptor binding of the circulating antibody thereby increasing tumor localization. See, e.g., U.S. Patent Nos. 5,585,097 and 8,591,886, each of which is herein incorporated by reference in its entirety, for a description of mutations that delete or inactivate the constant domain and thereby increase tumor localization.
  • one or more amino acid substitutions may be introduced into the Fc region of an antibody described herein to remove potential glycosylation sites on Fc region, which may reduce Fc receptor binding (see, e.g.
  • one or more of the following mutations in the constant region of an antibody described herein may be made: an N297A substitution; an N297Q substitution; a L235A substitution and a L237A substitution; a L234A substitution and a L235A substitution; a E233P substitution; a L234V substitution; a L235A substitution; a C236 deletion; a P238A substitution; a D265A substitution; a A327Q substitution; or a P329A substitution, numbered according to the EU numbering system.
  • a mutation selected from the group consisting of D265A, P329A, and a combination thereof may be made in the constant region of an antibody described herein.
  • an antibody described herein comprises the constant domain of an IgGi with an N297Q or N297A amino acid substitution, numbered according to the EU numbering system.
  • an antibody described herein comprises the constant domain of an IgGi with a mutation selected from the group consisting of D265A, P329A, and a combination thereof, numbered according to the EU numbering system.
  • an antibody described herein comprises the constant domain of an IgGi with a mutation selected from the group consisting of L234A, L235A, and a combination thereof, numbered according to the EU numbering system.
  • amino acid residues in the constant region of an antibody described herein in the positions corresponding to positions L234, L235, and D265 in a human IgGi heavy chain, numbered according to the EU index of numbering, are not L, L, and D, respectively.
  • This approach is described in detail in International Publication No. WO 14/108483, which is herein incorporated by reference in its entirety.
  • the amino acids corresponding to positions L234, L235, and D265 in a human IgGi heavy chain are F, E, and A; or A, A, and A, respectively.
  • one or more amino acids selected from amino acid residues 329, 331, and 322 in the constant region of an antibody described herein, numbered according to the EU numbering system can be replaced with a different amino acid residue such that the antibody has altered Clq binding and/or reduced or abolished complement dependent cytotoxicity (CDC).
  • CDC complement dependent cytotoxicity
  • the Fc region of an antibody described herein is modified to increase the ability of the antibody to mediate antibody dependent cellular cytotoxicity (ADCC) and/or to increase the affinity of the antibody for an Fey receptor by mutating one or more amino acids (e.g., introducing amino acid substitutions) at the following positions: 238, 239, 248, 249, 252, 254, 255, 256, 258, 265, 267, 268, 269, 270, 272, 276, 278, 280, 283, 285, 286, 289, 290, 292, 293, 294, 295, 296, 298, 301, 303, 305, 307, 309, 312, 315, 320, 322, 324, 326, 327, 328, 329, 330, 331, 333, 334, 335, 337, 338, 340, 360, 373, 376, 378, 382, 388, 389, 398,
  • ADCC antibody dependent cellular cytotoxicity
  • an antibody described herein comprises the constant region of an IgG 4 antibody and the serine at amino acid residue 228 of the heavy chain, numbered according to the EU numbering system, is substituted for proline.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a heavy chain constant region comprising the amino acid sequence of SEQ ID NO: 196.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3), the antibody comprising a heavy chain constant region comprising the amino acid sequence of SEQ ID NO: 197.
  • any of the constant region mutations or modifications described herein can be introduced into one or both heavy chain constant regions of an antibody described herein having two heavy chain constant regions.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3) and functions as an antagonist.
  • LAG-3 e.g. , human LAG-3
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3) and decreases LAG-3 (e.g. , human LAG-3) activity by at least 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 98%, or 99% as assessed by methods described herein and/or known to one of skill in the art, relative to LAG-3 (e.g. , human LAG-3) activity without any antibody or with an unrelated antibody (e.g. , an antibody that does not specifically bind to LAG-3 (e.g. , human LAG-3)).
  • LAG-3 e.g. , human LAG-3
  • LAG-3 e.g. , human LAG-3
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG- 3) and decreases LAG-3 (e.g. , human LAG-3) activity by at least about 1.2 fold, 1.3 fold, 1.4 fold, 1.5 fold, 2 fold, 2.5 fold, 3 fold, 3.5 fold, 4 fold, 4.5 fold, 5 fold, 6 fold, 7 fold, 8 fold, 9 fold, 10 fold, 15 fold, 20 fold, 30 fold, 40 fold, 50 fold, 60 fold, 70 fold, 80 fold, 90 fold, or 100 fold as assessed by methods described herein and/or known to one of skill in the art, relative to LAG-3 (e.g. , human LAG-3) activity without any antibody or with an unrelated antibody (e.g.
  • an antibody that does not specifically bind to LAG-3 e.g. , human LAG-3)
  • LAG-3 (e.g. , human LAG-3) activity can include LAG-3 (e.g. , human LAG-3) signaling, LAG-3 (e.g. , human LAG-3) binding to LAG-3 (e.g. , human LAG- 3) ligand (e.g. , MHC class II), and inhibition of cytokine production (e.g. , IL-2 and/or TNF- a).
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g.
  • LAG-3 e.g. , human LAG-3
  • deactivates, reduces, or inhibits a LAG-3 (e.g. , human LAG-3) activity e.g. , human LAG-3) and deactivates, reduces, or inhibits a LAG-3 (e.g. , human LAG-3) activity.
  • a decrease in a LAG-3 (e.g. , human LAG-3) activity is assessed as described in the Examples, infra.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3) and reduces LAG-3 (e.g. , human LAG-3) binding to its ligand (e.g., MHC class II) by at least about 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 98%, or 99%, as assessed by methods described herein (see the Examples, infra) or known to one of skill in the art, relative to LAG-3 (e.g. , human LAG-3) binding to its ligand (e.g.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3) and reduces LAG-3 (e.g. , human LAG-3) binding to its ligand (e.g.
  • MHC class II by at least about 1.2 fold, 1.3 fold, 1.4 fold, 1.5 fold, 2 fold, 2.5 fold, 3 fold, 3.5 fold, 4 fold, 4.5 fold, 5 fold, 6 fold, 7 fold, 8 fold, 9 fold, 10 fold, 15 fold, 20 fold, 30 fold, 40 fold, 50 fold, 60 fold, 70 fold, 80 fold, 90 fold, or 100 fold, as assessed by methods described herein (see the Examples, infra) or known to one of skill in the art, relative to LAG-3 (e.g. , human LAG-3) binding to its ligand (e.g. , MHC class II) without any antibody or with an unrelated antibody (e.g. , an antibody that does not specifically bind to LAG-3 (e.g. , human LAG-3)).
  • LAG-3 e.g. , human LAG-3
  • its ligand e.g. , MHC class II
  • an unrelated antibody e.g. , an antibody that does not specifically bind to LAG-3
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3) and increases cytokine production (e.g. , IL- 2 and/or TNF-a) by at least about 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 98%, or 99%, as assessed by methods described herein (see the Examples, infra) or known to one of skill in the art, relative to cytokine production without any antibody or with an unrelated antibody (e.g. , an antibody that does not specifically bind to LAG-3 (e.g.
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3) and increases cytokine production (e.g. , IL-2 and/or TNF-a) by at least about 1.2 fold, 1.3 fold, 1.4 fold, 1.5 fold, 2 fold, 2.5 fold, 3 fold, 3.5 fold, 4 fold, 4.5 fold, 5 fold, 6 fold, 7 fold, 8 fold, 9 fold, 10 fold, 15 fold, 20 fold, 30 fold, 40 fold, 50 fold, 60 fold, 70 fold, 80 fold, 90 fold, or 100 fold, as assessed by methods described herein (see the Examples, infra) or known to one of skill in the art, relative to cytokine production without any antibody or with an unrelated antibody (e.g. , an antibody that does not specifically bind to LAG-3 (e.g. , human LAG-3)).
  • cytokine production e.g. IL-2 and/or TNF-a
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3) and either alone or in combination with an anti-PD- 1 antibody (e.g. , pembrolizumab or nivolumab), an anti-PD-Ll antibody (e.g. , avelumab, durvalumab, or atezolizumab), or an anti-CTLA-4 antibody (e.g.
  • an anti-PD- 1 antibody e.g. , pembrolizumab or nivolumab
  • an anti-PD-Ll antibody e.g. , avelumab, durvalumab, or atezolizumab
  • an anti-CTLA-4 antibody e.g.
  • ipilimumab increases IL-2 production in human peripheral blood mononuclear cells (PBMCs) in response to Staphylococcus Enterotoxin A (SEA) stimulation by at least about 1.2 fold, 1.3 fold, 1.4 fold, 1.5 fold, 2 fold, 2.5 fold, 3 fold, 3.5 fold, 4 fold, 4.5 fold, 5 fold, 6 fold, 7 fold, 8 fold, 9 fold, 10 fold, 15 fold, 20 fold, 30 fold, 40 fold, 50 fold, 60 fold, 70 fold, 80 fold, 90 fold, or 100 fold, as assessed by methods described herein (see the Examples, infra) or known to one of skill in the art, relative to IL-2 production without any antibody or with an unrelated antibody (e.g. , an antibody that does not specifically bind to LAG-3 (e.g., human LAG-3)).
  • PBMCs peripheral blood mononuclear cells
  • SEA Staphylococcus Enterotoxin A
  • PBMCs peripheral blood mononuclear cells
  • SEA Staphylococcus Enterotoxin A
  • human LAG-3 have increased IL-2 production by at least about 1.2 fold, 1.3 fold, 1.4 fold, 1.5 fold, 2 fold, 2.5 fold, 3 fold, 3.5 fold, 4 fold, 4.5 fold, 5 fold, 6 fold, 7 fold, 8 fold, 9 fold, 10 fold, 15 fold, 20 fold, 30 fold, 40 fold, 50 fold, 60 fold, 70 fold, 80 fold, 90 fold, or 100 fold relative to PBMCs only stimulated with SEA without any antibody or with an unrelated antibody (e.g., an antibody that does not specifically bind to LAG-3 (e.g. , human LAG-3)), as assessed by methods described herein (see the Examples, infra) or known to one of skill in the art.
  • an unrelated antibody e.g., an antibody that does not specifically bind to LAG-3 (e.g. , human LAG-3)
  • the instant disclosure provides an isolated antibody that specifically binds to LAG-3 (e.g. , human LAG-3) and either alone or in combination with an anti-PD-1 antibody (e.g. , pembrolizumab or nivolumab) increases TNFa production in tumor infiltrating lymphocytes (TILs) in response to anti-CD3 antibody and anti-CD28 antibody stimulation by at least about 1.2 fold, 1.3 fold, 1.4 fold, 1.5 fold, 2 fold, 2.5 fold, 3 fold, 3.5 fold, 4 fold, 4.5 fold, 5 fold, 6 fold, 7 fold, 8 fold, 9 fold, 10 fold, 15 fold, 20 fold, 30 fold, 40 fold, 50 fold, 60 fold, 70 fold, 80 fold, 90 fold, or 100 fold, as assessed by methods described herein (see the Examples, infra) or known to one of skill in the art, relative to TNFa production without an antibody that specifically binds to LAG-3 (e.g. , human LAG-3).
  • an anti-PD-1 antibody e.g
  • tumor infiltrating lymphocytes stimulated with anti-CD3 and anti-CD28 antibodies in the presence of an antibody described herein, which specifically binds to LAG-3 (e.g., human LAG-3), have increased TNFa production by at least about 1.2 fold, 1.3 fold, 1.4 fold, 1.5 fold, 2 fold, 2.5 fold, 3 fold, 3.5 fold, 4 fold, 4.5 fold, 5 fold, 6 fold, 7 fold, 8 fold, 9 fold, 10 fold, 15 fold, 20 fold, 30 fold, 40 fold, 50 fold, 60 fold, 70 fold, 80 fold, 90 fold, or 100 fold relative to TILs only stimulated with anti-CD3 and anti-CD28 antibodies without an antibody that specifically binds to LAG-3 (e.g.
  • the TILs are from renal cell carcinoma tumor. In another embodiment, the TILs are from colorectal cancer tumor.

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KR1020237030065A KR20230133934A (ko) 2016-10-11 2017-10-11 항-lag-3 항체 및 이의 사용 방법
CN202311544135.XA CN117586403A (zh) 2016-10-11 2017-10-11 抗lag-3抗体及其使用方法
EP17794131.7A EP3526256B1 (en) 2016-10-11 2017-10-11 Anti-lag-3 antibodies and methods of use thereof
CA3037380A CA3037380A1 (en) 2016-10-11 2017-10-11 Anti-lag-3 antibodies and methods of use thereof
KR1020197012657A KR102576042B1 (ko) 2016-10-11 2017-10-11 항-lag-3 항체 및 이의 사용 방법
IL302808A IL302808B2 (en) 2016-10-11 2017-10-11 Anti-lag-3 antibodies and methods of using them
EA201990927A EA201990927A1 (ru) 2016-11-10 2017-10-11 Антитела против lag-3 и способы их применения
IL265800A IL265800B2 (en) 2016-10-11 2017-10-11 Anti-LAG-3 antibodies and methods of using them
IL320174A IL320174A (en) 2016-10-11 2017-10-11 Anti-LAG-3 antibodies and methods of using them
NZ751913A NZ751913B2 (en) 2017-10-11 Anti-lag-3 antibodies and methods of use thereof
CN201780072250.8A CN110023337B (zh) 2016-10-11 2017-10-11 抗lag-3抗体及其使用方法
JP2019519724A JP7066696B2 (ja) 2016-10-11 2017-10-11 抗ｌａｇ－３抗体及びその使用方法
BR112019007369-8A BR112019007369A2 (pt) 2016-10-11 2017-10-11 anticorpos anti-lag-3 e métodos de uso dos mesmos
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