Classifications

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  • 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
  • C07K16/30—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants from tumour cells
• • 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
  • A61K47/6801—Drug-antibody or immunoglobulin conjugates defined by the pharmacologically or therapeutically active agent
  • A61K47/6803—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates
  • A61K47/68031—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates the drug being an auristatin
• • 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
  • A61K47/6851—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 determinant of a tumour cell
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
  • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
  • C07K14/705—Receptors; Cell surface antigens; Cell surface determinants
  • C07K14/70503—Immunoglobulin superfamily
  • C07K14/7051—T-cell receptor (TcR)-CD3 complex
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  • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
  • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
  • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
  • C12N15/02—Preparation of hybrid cells by fusion of two or more cells, e.g. protoplast fusion
• • 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
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • 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
  • C07K2317/31—Immunoglobulins specific features characterized by aspects of specificity or valency multispecific
• • 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
  • C07K2317/40—Immunoglobulins specific features characterized by post-translational modification
• • 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
  • C07K2317/90—Immunoglobulins specific features characterized by (pharmaco)kinetic aspects or by stability of the immunoglobulin
  • C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K2319/00—Fusion polypeptide
  • C07K2319/01—Fusion polypeptide containing a localisation/targetting motif
  • C07K2319/03—Fusion polypeptide containing a localisation/targetting motif containing a transmembrane segment

Definitions

• multispecific antibodies comprising an antigen-binding fragment of the present disclosure and one or more antibody or antigen-binding fragment having binding specificity to a target antigen that is not 5T4.
• FIG. 17 shows that some of tested humanized 286B4 antibodies have similar to or even stronger binding activity than their chimeric antibody on CHOK1-hu5T4 cells or MCF-7 cells.
• FIG. 20 shows that the affinity maturated antibodies have enhanced binding capacity on 5T4-expressing cells than their parental Hu14G12-28 antibody.
• CDR complementarity determining region
• immunoglobulin subclasses e.g., IgG1, IgG2, IgG3, IgG4, IgG5, etc. are well characterized and are known to confer functional specialization. Modified versions of each of these classes and isotypes are readily discernable to the skilled artisan in view of the instant disclosure and, accordingly, are within the scope of the instant disclosure. All immunoglobulin classes are clearly within the scope of the present disclosure, the following discussion will generally be directed to the IgG class of immunoglobulin molecules.
• IgG a standard immunoglobulin molecule comprises two identical light chain polypeptides of molecular weight approximately 23,000 Daltons, and two identical heavy chain polypeptides of molecular weight 53,000-70,000 Daltons. The four chains are typically joined by disulfide bonds in a “Y” configuration wherein the light chains bracket the heavy chains starting at the mouth of the “Y” and continuing through the variable region.
• Antibodies, antigen-binding polypeptides, variants, or derivatives thereof of the disclosure include, but are not limited to, polyclonal, monoclonal, multispecific, human, humanized, primatized, or chimeric antibodies, single chain antibodies, epitope-binding fragments, e.g., Fab, Fab’ and F (ab’) 2, Fd, Fvs, single-chain Fvs (scFv) , single-chain antibodies, disulfide-linked Fvs (sdFv) , fragments comprising either a VK or VH domain, fragments produced by a Fab expression library, and anti-idiotypic (anti-Id) antibodies (including, e.g., anti-Id antibodies to LIGHT antibodies disclosed herein) .
• anti-Id antigen-binding polypeptides, variants, or derivatives thereof of the disclosure
• chimeric antibody will be held to mean any antibody wherein the immunoreactive region or site is obtained or derived from a first species and the constant region (which may be intact, partial or modified in accordance with the instant disclosure) is obtained from a second species.
• the target binding region or site will be from a non-human source (e.g. mouse or primate) and the constant region is human.
• the term “recombinant” as it pertains to polypeptides or polynucleotides intends a form of the polypeptide or polynucleotide that does not exist naturally, a non-limiting example of which can be created by combining polynucleotides that would not normally occur together.
• the instant inventors were able to generate anti-5T4 antibodies 14G12, 393E9, 113H5, 159D5, 24F10, 493E10, 257F1, 353H11, 367B8, 389G2, 109H7, 286B4, 37G6, 267B5, 425G1, 449H9, 49C5, 119G5, 85B10 and 95F10 (Table 1) .
• many of these antibodies exhibited greater biological activities than naptumomab (NeoTX) , a benchmark fusion protein comprising a Fab portion against 5T4.
• these antibodies showed cross-reactivity to cynomolgus monkey 5T4, which enables the pre-clinical evaluation moving forward.
• Bin A includes 159D5, 24F10, and 493E10
• Bin C includes 257F1, 353H11, 367B8, 389G2, and 109H7
• Bin D includes 286B4, 37G6, 267B5, 425G1, 449H9, 49C5, 119G5, 85B10 and 95F10. Sequence examination shows that certain CDRs of the antibodies in each of these bins are highly homologous and thus are contemplated to be interchangeable.
• an antibody or antigen-binding fragment thereof has binding specificity to the human 5T4 protein.
• the antibody or antigen-binding fragment thereof includes a heavy chain variable region (VH) that includes a VH CDR1, a VH CDR2 and a VH CDR3, and a light chain variable region (VL) that includes a VL CDR1, a VL CDR2, and a VL CDR3.
• VH heavy chain variable region
• VL light chain variable region
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 54; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 55; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 56; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 57; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 58; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 59.
• the VH CDR2 is PTM de-risked.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 54; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 55, or any one of SEQ ID NO: 60-63 or 266-267; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 56; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 57; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 58; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 59.
• the VH CDR2 is PTM de-risked.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 54; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 266; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 56; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 57; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 58; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 59.
• the VH CDR2 is PTM de-risked.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 54; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 267; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 56; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 57; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 58; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 59.
• An example VH sequence includes an amino acid sequence selected from the group consisting of SEQ ID NO: 3, 215-221 and 248-256.
• An example VL sequence includes an amino acid sequence selected from the group consisting of SEQ ID NO: 4 and 222-226.
• the VL includes an amino acid sequence of any one of SEQ ID NO: 4 and 222-226, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to any one of SEQ ID NO: 4 and 222-226, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• antibodies and antigen-binding fragments therefore that bind to the same epitope on 5T4 as 393E9. Also provided, in some embodiments, are antibodies and antigen-binding fragments therefore that competes with 393E9 in binding to 5T4.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 123; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 124; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 125; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 126; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 127; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 128.
• the VH CDR2 is PTM de-risked.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 123; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 124, or SEQ ID NO: 129; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 125; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 126; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 127; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 128.
• the PTM de-risked versions had enhanced affinity as compared to the chimeric version.
• An example VH sequence includes an amino acid sequence selected from the group consisting of SEQ ID NO: 23, 236-241 and 259-261.
• An example VL sequence includes an amino acid sequence selected from the group consisting of SEQ ID NO: 24 and 242-247.
• the VH includes an amino acid sequence of any one of SEQ ID NO: 23, 236-241 and 259-261, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to any one of SEQ ID NO: 23, 236-241 and 259-261, while retaining the corresponding VH CDRs or the PTM de-risked versions thereof.
• the VL includes an amino acid sequence of any one of SEQ ID NO: 24 and 242-247, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to any one of SEQ ID NO: 24 and 242-247, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• antibodies and antigen-binding fragments therefore that bind to the same epitope on 5T4 as 286B4. Also provided, in some embodiments, are antibodies and antigen-binding fragments therefore that competes with 286B4 in binding to 5T4.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 41; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 42; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 43; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 44; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 45; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 46.
• the VH CDR2 is PTM de-risked.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 41; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 42, or any one of SEQ ID NO: 47-53; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 43; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 44; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 45; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 46.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 41; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 42; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 43; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 44; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 45; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 264.
• the VH CDR2 is PTM de-risked.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 41; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 42; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 43; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 44; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 45; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 265.
• the VL includes an amino acid sequence of any one of SEQ ID NO: 2, 185-188, 193-194, 205-214 and 262-263, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to any one of SEQ ID NO: 2, 185-188, 193-194, 205-214 and 262-263, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• the VH includes an amino acid sequence of any one of SEQ ID NO: 197, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to any one of SEQ ID NO: 197, while retaining the corresponding VH CDRs or the PTM de-risked versions thereof.
• the VL includes an amino acid sequence of any one of SEQ ID NO: 262, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to any one of SEQ ID NO: 262, while retaining the corresponding VL CDRs or the affinity-maturated versions thereof.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 70; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 71; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 72; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 73; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 74; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 75.
• the VH CDR2 is PTM de-risked.
• the VH CDR1 includes the amino acid sequence of SEQ ID NO: 70; the VH CDR2 includes the amino acid sequence of SEQ ID NO: 71, or SEQ ID NO: 76; the VH CDR3 includes the amino acid sequence of SEQ ID NO: 72; the VL CDR1 includes the amino acid sequence of SEQ ID NO: 73; the VL CDR2 includes the amino acid sequence of SEQ ID NO: 74; and the VL CDR3 includes an amino acid sequence selected from the group consisting SEQ ID NO: 75.
• the PTM de-risked version (159D50-P1) had similar performance to the chimeric antibody.
• the VL includes an amino acid sequence of any one of SEQ ID NO: 8, 230-235 and 258, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to any one of SEQ ID NO: 8, 230-235 and 258, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• antibodies and antigen-binding fragments therefore that bind to the same epitope on 5T4 as 159D5. Also provided, in some embodiments, are antibodies and antigen-binding fragments therefore that competes with 159D5 in binding to 5T4.
• An example VH sequence includes the amino acid sequence of SEQ ID NO: 15 and an example VL sequence includes the amino acid sequence of SEQ ID NO: 16.
• the VH includes the amino acid sequence of SEQ ID NO: 15, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 15, while retaining the corresponding VH CDRs or the PTM de-risked versions thereof.
• the VL includes the amino acid sequence of SEQ ID NO: 16, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 16, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• An example VH sequence includes the amino acid sequence of SEQ ID NO: 21 and an example VL sequence includes the amino acid sequence of SEQ ID NO: 22.
• the VH includes the amino acid sequence of SEQ ID NO: 21, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 21, while retaining the corresponding VH CDRs or the PTM de-risked versions thereof.
• the VL includes the amino acid sequence of SEQ ID NO: 22, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 22, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• antibodies and antigen-binding fragments therefore that bind to the same epitope on 5T4 as 109H7. Also provided, in some embodiments, are antibodies and antigen-binding fragments therefore that competes with 109H7 in binding to 5T4.
• the VL includes the amino acid sequence of SEQ ID NO: 34, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 34, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• antibodies that include a set of CDR (VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3) of any of the antibodies disclosed herein, such as 14G12, 393E9, 113H5, 159D5, 24F10, 493E10, 257F1, 353H11, 367B8, 389G2, 109H7, 286B4, 37G6, 267B5, 425G1, 449H9, 49C5, 119G5, 85B10 and 95F10 (Table 1) , or PTM de-risked versions thereof.
• the CDR sequences are described in Tables 1-1 to 1-41.
• the VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3 comprise, respectively, the amino acid sequences of SEQ ID NO: 41, 42 (or any one of 47-53) , 43, 44, 45 and 46 (or 264 or 265) .
• the VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3 comprise, respectively, the amino acid sequences of SEQ ID NO: 54, 55 (or any one of 60-63, or 266 or 267) , 56, 57, 58 and 59.
• the VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3 comprise, respectively, the amino acid sequences of SEQ ID NO: 64-69. In some embodiments, the VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3 comprise, respectively, the amino acid sequences of SEQ ID NO: 70, 71 or 76, 72, 73, 74 or 75. In some embodiments, the VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3 comprise, respectively, the amino acid sequences of SEQ ID NO: 77-82.
• the VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3 comprise, respectively, the amino acid sequences of SEQ ID NO: 136-141. In some embodiments, the VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3 comprise, respectively, the amino acid sequences of SEQ ID NO: 142-147.
• the VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3 comprise, respectively, the amino acid sequences of SEQ ID NO: 148-153. In some embodiments, the VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3 comprise, respectively, the amino acid sequences of SEQ ID NO: 154-159. In some embodiments, the VH CDR1, VH CDR2, VH CDR3, VL CDR1, VL CDR2 and VL CDR3 comprise, respectively, the amino acid sequences of SEQ ID NO: 160, 161 or 166, 162, 163, 164 and 165.
• the VH includes the amino acid sequence of SEQ ID NO: 5, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 5, while retaining the corresponding VH CDRs or the PTM de-risked versions thereof.
• the VL includes the amino acid sequence of SEQ ID NO: 6, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 6, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• the VH includes the amino acid sequence of SEQ ID NO: 13, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 13, while retaining the corresponding VH CDRs or the PTM de-risked versions thereof.
• the VL includes the amino acid sequence of SEQ ID NO: 14, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 14, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• the VH includes the amino acid sequence of SEQ ID NO: 17, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 17, while retaining the corresponding VH CDRs or the PTM de-risked versions thereof.
• the VL includes the amino acid sequence of SEQ ID NO: 18, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 18, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• the VH includes the amino acid sequence of SEQ ID NO: 29, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 29, while retaining the corresponding VH CDRs or the PTM de-risked versions thereof.
• the VL includes the amino acid sequence of SEQ ID NO: 30, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 30, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• the VH includes the amino acid sequence of SEQ ID NO: 35, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 35, while retaining the corresponding VH CDRs or the PTM de-risked versions thereof.
• the VL includes the amino acid sequence of SEQ ID NO: 36, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 36, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• the VH includes the amino acid sequence of SEQ ID NO: 37, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 37, while retaining the corresponding VH CDRs or the PTM de-risked versions thereof.
• the VL includes the amino acid sequence of SEQ ID NO: 38, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to SEQ ID NO: 38, while retaining the corresponding VL CDRs or the PTM de-risked versions thereof.
• one or more specific peptide sequences within the conjugate are hydrolytically cleaved by one or more tumor-cell or cancer-cell-associated proteases, resulting in release of the drug.
• the released drug is then free to migrate within the cell and induce cytotoxic or cytostatic or other activities.
• the drug is cleaved from the antibody outside the tumor cell or cancer cell, and the drug subsequently penetrates the cell, or acts at the cell surface.
• the VL includes an amino acid sequence of any one of SEQ ID NO: 263, or a sequence having at least 75%, 80%, 85%, 90%, 95%or 99%sequence identity to any one of SEQ ID NO: 263, while retaining the corresponding VL CDRs or the affinity-maturated versions thereof.
• the mRNAs may contain sugar modifications.
• a typical sugar modification is a chemical modification of the sugar of the nucleotides it contains including, but not limited to, sugar modifications chosen from the group consisting of 2’-deoxy-2’-fluoro-oligoribonucleotide (2’-fluoro-2’-deoxycytidine 5’-triphosphate, 2’-fluoro-2’-deoxyuridine 5’-triphosphate) , 2’-deoxy-2’-deamine-oligoribonucleotide (2’-amino-2’-deoxycytidine 5’-triphosphate, 2’-amino-2’-deoxyuridine 5’-triphosphate) , 2’-O-alkyloligoribonucleotide, 2’-deoxy-2’-C-alkyloligoribonucleotide (2’-O-methylcytidine 5’-triphosphate, 2’
• the antibodies, variants, or derivatives of the present disclosure may be used in certain treatment and diagnostic methods.
• the term “pharmaceutically acceptable” means approved by a regulatory agency of the Federal or a state government or listed in the U.S. Pharmacopeia or other generally recognized pharmacopeia for use in animals, and more particularly in humans.
• a “pharmaceutically acceptable carrier” will generally be a non-toxic solid, semisolid or liquid filler, diluent, encapsulating material or formulation auxiliary of any type.
• the binding of the chimeric mAbs from these clones against recombinant 5T4 protein was tested with Biacore using a capture method.
• the mAbs were captured using Protein A chip.
• a serial dilution of human 5T4-his tag protein was injected over captured antibody for 2-3 mins at a flow rate of 30 ⁇ l/min.
• the antigen was allowed to dissociate for 360-1000s. All the experiments were carried out on a Biacore T200. Data analysis was carried out using Biacore T200 evaluation software.
• Example 3 The binding activity to 5T4 antigen
• the 14G12 variable region genes were employed to create humanized mAbs.
• the amino acid sequences of the VH and VK of 14G12 were compared against the available database of human Ig gene sequences to find the overall best-matching human germline Ig gene sequences.
• microtiter plates were coated with human 5T4-His protein at 1 ⁇ g/ml in PBS, 100 ⁇ l/well at 4°C overnight, then blocked with 150 ⁇ l/well of 1%BSA. Serial dilutions of antibodies were added to each well and incubated for 1 hour at 37°C. The plates were washed with PBS/Tween and then incubated with Goat Anti-Human IgG-HRP for 30 mins at 37°C. After washing, the plates were developed with TMB substrate and analyzed by spectrophotometer at OD 450nm. As shown in FIG. 10 and Table 6, most of the humanized antibodies bound to human 5T4 at high activity.
• 393E9 humanized antibodies To evaluate the binding activity of 393E9 humanized antibodies to human 5T4, the 393E9 chimeric antibody (393E9-C) along with 393E9 humanized mAbs were subjected to ELISA test.
• microtiter plates were coated with human 5T4-His protein at 1 ⁇ g/ml in PBS, 100 ⁇ l/well at 4°C overnight, then blocked with 150 ⁇ l/well of 1%BSA. 4-fold dilutions of antibodies starting from 20 nM were added to each well and incubated for 1 hour at 37°C. The plates were washed with PBS/Tween and then incubated with Goat Anti-Human IgG-HRP for 30 mins at 37°C. After washing, the plates were developed with TMB substrate and analyzed by spectrophotometer at OD 450nm. As shown in FIG. 12 and Table 9, most of the humanized antibodies bound to human 5T4 with high activity.
• the 159D5 variable region genes were employed to create humanized mAbs.
• the amino acid sequences of the VH and VK of 159D5 were compared against the available database of human Ig gene sequences to find the overall best-matching human germline Ig gene sequences.
• Example 9 Binding activity of 159D5 humanized antibodies to human 5T4 antigen
• microtiter plates were coated with human 5T4-His protein at 1 ⁇ g/ml in PBS, 100 ⁇ l/well at 4°C overnight, then blocked with 150 ⁇ l/well of 1%BSA. Serial dilutions of antibodies were added to each well and incubated for 1 hour at 37°C. The plates were washed with PBS/Tween and then incubated with Goat Anti-Human IgG-HRP for 30 mins at 37°C. After washing, the plates were developed with TMB substrate and analyzed by spectrophotometer at OD 450nm. As shown in FIG. 14 and Table 12, most of the humanized antibodies bound to human 5T4 with high activity.
• the binding of the 159D5 humanized antibodies to recombinant 5T4 protein was tested with Biacore using a capture method.
• the mAbs were captured using Protein A chip.
• 50 nM of human 5T4-his tag protein was injected over captured antibody for 3 mins at a flow rate of 30 ⁇ l/min.
• the antigen was allowed to dissociate for 600s. All the experiments were carried out on a Biacore T200. Data analysis was carried out using the Biacore T200 evaluation software. The results are shown in Table 13 below.
• VH4-28/JH6 was chosen as the humanization backbone, and for the light chain of 286B4, VL-O18/JK4 is the best fit germline.
• Humanized 286B4 CDR grafting antibody was then designed where the CDRL1, L2, and L3 were grafted onto framework sequences of the VL-O18-JK4, and the CDRH1, H2, and H3 were grafted onto framework sequences of the VH4-28-JH6.
• a 3D model was then generated to determine the amino acids in the original mouse FR region sequences that are essential for antibody binding and conformation. Based on the 286B4 CDR grafting antibody sequence, 4 additional humanized heavy chains and 5 additional light chains were created.
• the 286B4 chimeric antibody along with 286B4 humanized mAbs were subjected to ELISA test.
• microtiter plates were coated with human 5T4-His protein at 1 ug/ml in PBS, 100 ⁇ l/well at 4°C overnight, then blocked with 150 ⁇ l/well of 1%BSA. 4-fold dilutions of tested antibodies starting from 20 nM were added to each well and incubated for 1 hour at 37°C. The plates were washed with PBS/Tween and then incubated with Goat Anti-Human IgG-HRP for 30 mins at 37°C. After washing, the plates were developed with TMB substrate and analyzed by spectrophotometer at OD 450nm. As shown in FIG. 16 and Table 15, most of the humanized clones bound to human 5T4 with high potency.
• the binding of the 286B4 humanized antibodies to recombinant 5T4 protein was tested with Biacore using a capture method.
• the mAbs were captured using Protein A chip.
• a serial dilution of human 5T4-his tag protein was injected over captured antibody for 3 mins at a flow rate of 30 ⁇ l/min.
• the antigen was allowed to dissociate for 280-800s. All the experiments were carried out on a Biacore T200. Data analysis was carried out using the Biacore T200 evaluation software. The results are shown in Table 16 below.
• the 159D5 VH CDR2 include DS residues (Kabat numbering) which are at risk of post-translational modifications (PTM) and pose challenges for future manufacturing. Therefore, this example mutated DS to DA on the VH to prevent PTM.
• the sequences of the potential PTM removal site are listed in Table 18. As shown in FIG. 14B, FIG. 15 and Table 13, PTM removal antibody of 159D5-P1 showed comparable binding ability to 159D5 chimeric antibody of 159D5-C.
• the 286B4 VH CDR2 include DG residues (Kabat numbering) which are at risk of post-translational modifications (PTM) and pose challenges for future manufacturing. Therefore, this example mutated DG to DA on the VH to prevent PTM.
• the sequences of the potential PTM removal site are listed in Table 19.
• trispecific antibodies with anti-5T4 portion of Hu286B4-3-P1, Hu286B4-5-P1, Hu286B4-8-P1, Hu286B4-15-P1 or chimeric 286B4 were analyzed for their binding to CHOK1-hu5T4 cells by FACS.
• a total number of 1X10 5 cells in each well were incubated with 4-fold serial diluted antibodies starting from 100 nM for 30 minutes at 4°C. After wash by FACS buffer, PE conjugated-anti-human IgG antibody was added to each well and incubated at 4°C for 30 minutes. MFI of PE was evaluated by MACSQuant Analyzer 16.
• the trispecific antibodies with PTM removal 286B4 fragment showed enhanced binding capacity on 5T4-expressing cells than that with chimeric 286B4 fragment. The only difference among tested trispecific antibodies was the anti-5T4 portion.
• variable regions of frameworks engrafted affinity maturated candidates are listed in Table 20 below.
• microtiter plates were coated with human 5T4-His protein at 2 ⁇ g/ml in PBS, 30 ⁇ l/well at 4°C overnight, then blocked with 5%PBS/Milk. Serial dilutions of antibodies were added to each well and incubated for 1 hour at room temperature. The plates were washed with PBS/Tween and then incubated with Goat Anti-Human IgG-HRP for 50 mins at room temperature. After washing, the plates were developed with TMB substrate and analyzed by spectrophotometer at OD 450nm. As shown in FIG. 19, the affinity maturated antibodies bound to human 5T4 with higher potency than the parental Hu14G12-28 antibody.
• affinity maturated antibodies were analyzed for their binding to CHOK1-hu5T4, HEK293-hu5T4 or MCF-7 cells by FACS.
• a total number of 1X10 5 cells in each well were incubated with 4-fold or 5-fold serial diluted antibodies starting from 133 nM or 100 nM for 60 minutes at 4°C.
• PE conjugated-anti-human IgG antibody was added to each well and incubated at 4°C for 30 minutes.
• MFI of PE was evaluated by MACSQuant Analyzer 16.
• FIG. 20A-B CHOK1-hu5T4 cells
• FIG. 20C-D HEK293-hu5T4 cells
• FIG. 20E MCF-7 cells
• the affinity maturated antibodies Hu14G12-28-88#and Hu14G12-28-108# significantly increased binding affinity against human 5T4 protein by 9.45 fold and 7.41 fold respectively, compared to the parental Hu14G12-28 antibody, which makes them ideal anti-5T4 antibody for antibody-drug conjugates (ADC) and for bispecific antibodies.

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