WO2016083468A1 - Pyrrolobenzodiazepine-antibody conjugates - Google Patents

Pyrrolobenzodiazepine-antibody conjugates Download PDF

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Publication number
WO2016083468A1
WO2016083468A1 PCT/EP2015/077684 EP2015077684W WO2016083468A1 WO 2016083468 A1 WO2016083468 A1 WO 2016083468A1 EP 2015077684 W EP2015077684 W EP 2015077684W WO 2016083468 A1 WO2016083468 A1 WO 2016083468A1
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Prior art keywords
group
antibody
alkyl
methyl
linker
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PCT/EP2015/077684
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English (en)
French (fr)
Inventor
Patricius Henrikus Cornelis VAN BERKEL
Philip Wilson Howard
John Hartley
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Adc Therapeutics Sa
Medimmune Limited
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Publication date
Priority claimed from GBGB1420910.0A external-priority patent/GB201420910D0/en
Priority claimed from GBGB1513605.4A external-priority patent/GB201513605D0/en
Priority to CN201580072448.7A priority Critical patent/CN107148285B/zh
Priority to JP2017546038A priority patent/JP6878287B2/ja
Priority to NZ731782A priority patent/NZ731782A/en
Priority to US15/529,622 priority patent/US10780096B2/en
Priority to BR112017011111A priority patent/BR112017011111A2/pt
Priority to CA2968447A priority patent/CA2968447A1/en
Application filed by Adc Therapeutics Sa, Medimmune Limited filed Critical Adc Therapeutics Sa
Priority to AU2015352545A priority patent/AU2015352545B2/en
Priority to MX2017006770A priority patent/MX2017006770A/es
Priority to KR1020177014301A priority patent/KR20170101895A/ko
Priority to EP15801398.7A priority patent/EP3223854A1/en
Publication of WO2016083468A1 publication Critical patent/WO2016083468A1/en
Priority to ZA2017/04297A priority patent/ZA201704297B/en
Priority to US17/006,681 priority patent/US20210113587A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/55—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having seven-membered rings, e.g. azelastine, pentylenetetrazole
    • A61K31/551—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having seven-membered rings, e.g. azelastine, pentylenetetrazole having two nitrogen atoms, e.g. dilazep
    • A61K31/5513—1,4-Benzodiazepines, e.g. diazepam or clozapine
    • A61K31/5517—1,4-Benzodiazepines, e.g. diazepam or clozapine condensed with five-membered rings having nitrogen as a ring hetero atom, e.g. imidazobenzodiazepines, triazolam
    • 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
    • A61K47/68035—Drugs conjugated to an antibody or immunoglobulin, e.g. cisplatin-antibody conjugates the drug being a pyrrolobenzodiazepine
    • 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
    • A61K47/6889—Conjugates wherein the antibody being the modifying agent and wherein the linker, binder or spacer confers particular properties to the conjugates, e.g. peptidic enzyme-labile linkers or acid-labile linkers, providing for an acid-labile immuno conjugate wherein the drug may be released from its antibody conjugated part in an acidic, e.g. tumoural or environment
    • 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
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A61P35/04—Antineoplastic agents specific for metastasis
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
    • C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
    • C07K16/2866—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against receptors for cytokines, lymphokines, interferons
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
    • C07K2317/21—Immunoglobulins specific features characterized by taxonomic origin from primates, e.g. man
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups

Definitions

  • the present disclosure relates to particular uses of pyrrolobenzodiazepines (PBDs) having a labile C2 or N10 protecting group in the form of a linker to an antibody which binds to CD25.
  • PBDs pyrrolobenzodiazepines
  • PBDs pyrrolobenzodiazepines
  • Family members include abbeymycin (Hochlowski, et al., J. Antibiotics, 40, 145-148 (1987)), chicamycin (Konishi, et al., J. Antibiotics, 37, 200-206 (1984)), DC-81 (Japanese Patent 58-180 487; Thurston, et al., Chem. Brit., 26, 767-772 (1990); Bose, et al., Tetrahedron, 48, 751-758 (1992)), mazethramycin (Kuminoto, et al., J.
  • PBDs are of the general structure:
  • a particularly advantageous pyrrolobenzodiazepine compound is described by Gregson et al. ⁇ Chem. Commun. 1999, 797-798) as compound 1 , and by Gregson et al. (J. Med. Chem. 2001 , 44. 1 161 -1 174) as compound 4a.
  • This compound also known as SG2000, is shown below:
  • WO 2007/085930 describes the preparation of dimer PBD compounds having linker groups for connection to a cell binding agent, such as an antibody.
  • the linker is present in the bridge linking the monomer PBD units of the dimer.
  • Dimer PBD compounds having linker groups for connection to a cell binding agent, such as an antibody are described in WO 201 1/130613 and WO 201 1/130616.
  • the linker in these compounds is attached to the PBD core via the C2 position, and are generally cleaved by action of an enzyme on the linker group.
  • the linker in these compounds is attached to one of the available N10 positions on the PBD core, and are generally cleaved by action of an enzyme on the linker group.
  • ADC antibody-drug conjugates
  • cytotoxic or cytostatic agents i.e. drugs to kill or inhibit tumor cells in the treatment of cancer
  • cytotoxic or cytostatic agents i.e. drugs to kill or inhibit tumor cells in the treatment of cancer
  • systemic administration of these unconjugated drug agents may result in unacceptable levels of toxicity to normal cells
  • Efforts to design and refine ADC have focused on the selectivity of monoclonal antibodies (mAbs) as well as drug mechanism of action, drug-linking, drug/antibody ratio (loading), and drug-releasing properties (Junutula, ei a/., 2008b Nature Biotech., 26(8):925-932; Dornan ei al (2009) Blood 1 14(13):2721-2729;
  • WO2014/571 19 disclosed PBD dimers conjugated to an anti-CD25 antibody. Disclosure
  • ADCs as defined herein when targeted against CD-25 positive cells, additionally have a powerful bystander effect against CD25-negative cells.
  • This finding provides additional utilities for such ADCs, implying new therapeutic contexts for use, for example in relation to tumours or other neoplasms in which both CD25+ve and CD25-ve cells are present, which (by way of non-limiting example) may be lymphomas in which the population of neoplastic CD-25 positive cells is heterogeneous, or in neoplasms lacking CD25 but infiltrated with CD-25 positive activated T-cells.
  • a preferred first aspect provides a method of treating a proliferative disease in a subject, which disease is characterised by the presence of a neoplasm comprising both CD25+ve and CD25-ve cells,
  • said method comprising administering to a subject a conjugate of formula L - (D L ) P , where D l is of formula I or II:
  • L is an antibody (Ab) which binds to CD25;
  • p is an integer from 1 to 20;
  • R 12 is selected from the group consisting of:
  • each of R 21 , R 22 and R 23 are independently selected from H, C1-3 saturated alkyl, C2-3 alkenyl, C2-3 alkynyl and cyclopropyl, where the total number of carbon atoms in the R 12 group is no more than 5;
  • R 25a and R 25b are H and the other is selected from: phenyl, which phenyl is optionally substituted by a group selected from halo, methyl, methoxy;
  • R 24 is selected from: H; C1-3 saturated alkyl; C2-3 alkenyl; C2-3 aikynyl; cyclopropyl; phenyl, which phenyl is optionally substituted by a group selected from halo, methyl, methoxy; pyridyl; and thiophenyl;
  • R 12 is , where R 26a and R 26b are independently selected from H, F, C saturated alkyl, C2-3 alkenyl, which alkyl and alkenyl groups are optionally substituted by a group selected from C1- alkyl amido and C alkyl ester; or, when one of R 26a and R 26b is H, the other is selected from nitrile and a CM alkyl ester;
  • R 6 and R 9 are independently selected from H, R, OH, OR, SH, SR, N H 2 , N H R, N RR', nitro, Me3Sn and halo;
  • R and R' are independently selected from optionally substituted C1-12 alkyl, C3-20 heterocyclyl and C5-20 aryl groups;
  • R 7 is selected from H, R, OH, OR, SH, SR, N H 2 , N H R, N H RR', nitro, Me 3 Sn and halo;
  • R" is a C3-12 alkylene group, which chain may be interrupted by one or more heteroatoms, e.g. O, S, N R N2 (where R N2 is H or CM alkyl), and/or aromatic rings, e.g. benzene or pyridine;
  • Y and Y' are selected from O, S, or N H;
  • R 6' , R 7 , R 9' are selected from the same groups as R 6 , R 7 and R 9 respectively;
  • R Lr is a linker for connection to the antibody (Ab);
  • R 11a is selected from OH, OR A , where R A is CM alkyl, and SO z M, where z is 2 or 3 and M is a monovalent pharmaceutically acceptable cation;
  • R 20 and R 21 either together form a double bond between the nitrogen and carbon atoms to which they are bound or;
  • R 20 is selected from H and R C , where R c is a capping group
  • R 21 is selected from OH, OR A and SO z M;
  • R 2 is selected from the group consisting of:
  • R 15a and R 15b are H and the other is selected from: phenyl, which phenyl is optionally substituted by a group selected from halo, methyl, methoxy; pyridyl; and thiophenyl; and
  • R 14 is selected from: H; C1-3 saturated alkyl; C2-3 alkenyl; C2-3 alkynyi; cyclopropyl; phenyl, which phenyl is optionally substituted by a group selected from halo, methyl, methoxy; pyridyl; and thiophenyl;
  • R 2 is , where R 16a and R 16b are independently selected from H, F, CM saturated alkyl, C2-3 alkenyl, which alkyl and alkenyl groups are optionally substituted by a group selected from C alkyl amido and CM alkyl ester; or, when one of R 16a and R 16b is H, the other is selected from nitrile and a CM alkyl ester;
  • R 22 is of formula I l ia, formula I llb or formula l l lc:
  • A is a C5-7 aryl group
  • Q 1 is a single bond
  • Q 2 is selected from a single bond and -Z-(CH2)n-, where Z is selected from a single bond, O, S and NH and n is from 1 to 3;
  • R C1 , R C2 and R C3 are independently selected from H and unsubstituted C1-2 alkyl;
  • Q is selected from 0-R L2' , S-R L2' and N R N -R L2' , and R N is selected from H, methyl and ethyl
  • R N is selected from the group comprising H and C alkyl
  • R 1 2' is a linker for connection to the antibody (Ab);
  • R 10 and R 1 1 either together form a double bond between the nitrogen and carbon atoms to which they are bound or;
  • R 10 is H and R 11 is selected from OH, OR A and SO Z M;
  • R 30 and R 31 either together form a double bond between the nitrogen and carbon atoms to which they are bound or;
  • R 30 is H and R 31 is selected from OH, OR A and SO Z M.
  • a proliferative disease in a subject which disease is characterised by the presence of a neoplasm comprising both CD25+ve and CD25-ve cells
  • said method comprising administering to a subject a conjugate of formula A:
  • D represents either grou D1 or D2:
  • R 2 is selected from the group consisting of:
  • R 35a and R 35b are H and the other is selected from: phenyl, which phenyl is optionally substituted by a group selected from halo, methyl, methoxy; pyridyl; and thiophenyl; and
  • R 34 is selected from: H; C1-3 saturated alkyi; C2-3 alkenyl; C2-3 aikynyl; cyclopropyl; phenyl, which phenyl is optionally substituted by a group selected from halo, methyl, methoxy; pyridyl; and thiophenyl;
  • R 2 is , where R 36a and R 36b are independently selected from H, F, C1-4 saturated alkyi, C2-3 alkenyl, which alkyi and alkenyl groups are optionally substituted by a group selected from C1-4 alkyl amido and C1-4 alkyl ester; or, when one of R 16a and R 16 is H, the other is selected from nitrile and a C1-4 alkyl ester;
  • D' represents either grou D'1 or D'2:
  • R 6 and R 9 are independently selected from H, R, OH, OR, SH, SR, NH 2 , NHR, NRR', NO2, MeaSn and halo;
  • R 7 is independently selected from H, R, OH, OR, SH, SR, NH 2 , NHR, NRR * , N0 2 , Me-iSn and halo;
  • Y is selected from formulae A1 , A2, A3, A4, A5 and A6:
  • L is a linker connected to a cell binding agent
  • CBA is an antibody (Ab) which binds to CD25;
  • n is an integer selected in the range of 0 to 48;
  • R M is a Ci-a alkylene group
  • R 10 is H, and R 1 1 is OH, OR A , where R A is C alkyl; or
  • R 10 and R 11 form a nitrogen-carbon double bond between the nitrogen and carbon atoms to which they are bound;
  • R 10 is H and R 11 is OSO z M, where z is 2 or 3 and M is a monovalent
  • R and R' are each independently selected from optionally substituted C1-12 alkyl, C3-20 heterocyclyl and C5-20 aryl groups, and optionally in relation to the group NRR', R and R' together with the nitrogen atom to which they are attached form an optionally substituted 4-, 5-, 6- or 7-membered heterocyclic ring;
  • R 16 , R 1/ , R 19 , R 20 , R 21 and R 22 are as defined for R 6 , R 7 , R 9 , R 10 , R 11 and R 2 respectively;
  • Z is CH or N
  • T and T ' are independently selected from a single bond or a C1-9 alkylene, which chain may be interrupted by one or more heteroatoms e.g. O, S, N(H), NMe, provided that the number of atoms in the shortest chain of atoms between X and X' is 3 to 12 atoms;
  • X and X' are independently selected from O, S and N(H).
  • Other structures for A which, when CBA is an antibody (Ab) which binds to CD25, can be used with the present disclosure are described in WO2014/140862 and WO2014/159981.
  • L A is selected from:
  • w ere r represents a 5 ary ene group, e.g. p eny ene.
  • the disclosure provides a method of treating a proliferative disease in a subject, which disease is characterised by the presence of a neoplasm comprising both CD25+ve and CD25-ve cells, said method comprising administering to a subject a conjugate having the formula selected from the group comprising:
  • CBA is an antibody (Ab) which binds to CD25.
  • the Conjugates comprise an antibody (Ab) which binds to CD25 covalently linked to at least one Drug unit by a Linker unit.
  • the drug loading is represented by p, the number of drug molecules per antibody. Drug loading may range from 1 to 20 Drug units (D 1 ) per antibody.
  • D 1 Drug units
  • p represents the average drug loading of the Conjugates in the composition, and p ranges from 1 to 20.
  • the drug moiety may be cleaved in vivo prior to or after internalisation by said CD25+ve cells such as to release the PBD, wherein said PBD penetrates said both CD25+ve and CD25-ve cells causing cytoxicity thereto.
  • the cytotoxicity causes cell death.
  • a method of causing cytotoxicity to (more preferably cell death of) a neoplastic CD25-ve cell in the vicinity of a CD25+ve cell comprises uses of a conjugate as defined in the first aspect of the disclosure.
  • the method of this second aspect may be carried out in accordance with the first aspect.
  • the method may comprise the step of confirming the cytotoxicity to the CD25-ve cells.
  • the CD25+ve and CD25-ve cells may both be neoplastic cells, for example co-localised in a lymphoma.
  • the CD25+ve cell be a tumour infiltrating lymphocyte (TIL) and the CD25-ve cell may be a neoplastic cells, for example co-localised in a lymphoma or non-hematological cancer.
  • TIL tumour infiltrating lymphocyte
  • a method of selecting a subject for treatment with a conjugate as defined in the first aspect of the disclosure comprises screening said subject to identify the presence of a neoplasm comprising both CD25+ve and CD25-ve cells. Patients are selected wherein such a neoplasm is present.
  • the CD25+ve cell may be histologically constitutive of the neoplasm, or may an infiltrating cell such as a TIL.
  • a method of treating a proliferative disease in a subject comprising:
  • conjugates described herein for use in any one of the methods of the disclosure, and use of such conjugates for the preparation of a medicament for use in any one of the methods of the disclosure.
  • suitable diseases, neoplasms, and antibodies for the practice of the disclosure are described in more detail hereinafter.
  • the speficied link between the PBD dimer and the antibody, in the present disclosure is preferably stable extracellularly.
  • the antibody-drug conjugate (ADC) is preferably stable and remains intact, i.e. the antibody remains linked to the drug moiety.
  • the linkers are stable outside the target cell and may be cleaved at some efficacious rate inside the cell.
  • An effective linker will: (i) maintain the specific binding properties of the antibody; (ii) allow intracellular delivery of the conjugate or drug moiety; (iii) remain stable and intact, i.e.
  • Stability of the ADC may be measured by standard analytical techniques such as mass spectroscopy, HPLC, and the separation/analysis technique LC/MS.
  • CD25 is also known as: IL2 A, RP1 1-536K7.1 , IDDM10, IL2R, TCGFR, FIL-2 receptor subunit alpha; IL-2-RA; IL-2R subunit alpha; IL2-RA; TAC antigen; interleukin-2 receptor subunit alpha; p55
  • the CD25 polypeptide corresponds to Genbank accession no. NP_000408, version no. NP_000408.1 Gl:4557667, record update date: Sep 09, 2012 04:59 PM. In one
  • the nucleic acid encoding CD25 polypeptide corresponds to Genbank accession no. NM_000417, version no. NM_000417.2 Gl:269973860, record update date: Sep 09, 2012 04:59 PM.
  • CD25 polypeptide corresponds to
  • Antibodies that bind CD25 are described in:
  • an antibody having an antigen binding site comprises at least one domain which comprises CDR1 having the amino acid sequence in SEQ. ID. NO: 7,
  • CDR2 having the amino acid sequence in SEQ. ID. NO: 8, and CDR3 chaving the amino acid sequence in SEQ. ID. NO: 9; or said CDR1 , CDR2 and CDR3 taken in sequence as a whole comprise an amino acid sequence which is at least 90% identical to SEQ. ID. NOs: 7, 8 and 9 taken in sequence as a whole.
  • Example techniques include by immunohistochemistry (Strauchen et al., al., Am. J Pathol. 126:506-512, 1987, FACS (Gaikwad et al.. Int. J. Clin. Exp Pathol. 7: 6225- 6230, 2014) or imaging of patients using SPECT/PET following administration of
  • the antibody is an antibody that binds to CD25, the antibody comprising: a VH domain comprising a VH CDR1 with the amino acid sequence of SEQ ID NO.3, a VH CDR2 with the amino acid sequence of SEQ ID NO.4, and a VH CDR3 with the amino acid sequence of SEQ ID NO.5.
  • the antibody comprises a VH domain having the sequence according to SEQ ID NO. 1.
  • the antibody may further comprise: a VL domain comprising a VL CDR1 with the amino acid sequence of SEQ ID NO.6, a VL CDR2 with the amino acid sequence of SEQ ID NO.7, and a VL CDR3 with the amino acid sequence of SEQ ID NO.8.
  • the antibody further comprises a VL domain having the sequence according to SEQ ID NO. 2.
  • the antibody comprises a VH domain and a VL domain, the VH and VL domains having the sequences of SEQ ID NO. 1 paired with SEQ ID NO. 2.
  • the VH and VL domain(s) may pair so as to form an antibody antigen binding site that binds CD25.
  • the antibody is an intact antibody comprising a VH domain and a VL domain, the VH and VL domains having sequences of SEQ ID NO. 1 and SEQ ID NO. 2.
  • the antibody is a fully human monoclonal lgG1 antibody, preferably IgGI . K.
  • the antibody is the AB12 antibody described in WO 2004/045512 (Genmab A/S), otherwise known as HuMax-TAC.
  • the antibody is an antibody as described herein which has been modified (or further modified) as described below.
  • the antibody is a humanised, deimmunised or resurfaced version of an antibody disclosed herein.
  • antibody herein is used in the broadest sense and specifically covers monoclonal antibodies, polyclonal antibodies, dimers, multimers, multispecific antibodies (e.g., bispecific antibodies), intact antibodies (also described as “full-length” antibodies) and antibody fragments, so long as they exhibit the desired biological activity, which is the ability to bind CD25 (Miller et al (2003) Jour, of Immunology 170:4854-4861 ).
  • Antibodies may be murine, human, humanized, chimeric, or derived from other species.
  • An antibody is a protein generated by the immune system that is capable of recognizing and binding to a specific antigen.
  • a target antigen generally has numerous binding sites, also called epitopes, recognized by CDRs on multiple antibodies. Each antibody that specifically binds to a different epitope has a different structure. Thus, one antigen may have more than one corresponding antibody.
  • An antibody includes a full-length immunoglobulin molecule or an immunologically active portion of a full-length immunoglobulin molecule, i.e., a molecule that contains an antigen binding site that immunospecifically binds an antigen of a target of interest or part thereof, such targets including but not limited to, cancer cell or cells that produce autoimmune antibodies associated with an autoimmune disease.
  • a full-length immunoglobulin molecule or an immunologically active portion of a full-length immunoglobulin molecule i.e., a molecule that contains an antigen binding site that immunospecifically binds an antigen of a target of interest or part thereof, such targets including but not limited to, cancer cell or cells that produce autoimmune antibodies associated with an autoimmune disease.
  • immunoglobulin can be of any type (e.g. IgG, IgE, IgM, IgD, and IgA), class (e.g. lgG1 , lgG2, lgG3, lgG4, lgA1 and lgA2) or subclass, or allotype (e.g.
  • human G1 m1 , G1 m2, G1 m3, non- G1 m1 [that, is any allotype other than G1 m1 ], G1 m17, G2m23, G3m21 , G3m28, G3m1 1 , G3m5, G3m13, G3m14, G3m10, G3m15, G3m16, G3m6, G3m24, G3m26, G3m27, A2m1 , A2m2, Km1 , Km2 and Km3) of immunoglobulin molecule.
  • the immunoglobulins can be derived from any species, including human, murine, or rabbit origin.
  • binds CD25 is used to mean the antibody binds CD25 with a higher affinity than a non-specific partner such as Bovine Serum Albumin (BSA, Genbank accession no. CAA76847, version no. CAA76847.1 GL3336842, record update date: Jan 7, 201 1 02:30 PM).
  • BSA Bovine Serum Albumin
  • the antibody binds CD25 with an association constant (K a ) at least 2, 3, 4, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10 4 , 10 5 or 10 6 -fold higher than the antibody's association constant for BSA, when measured at physiological conditions.
  • the antibodies of the disclosure can bind CD25 with a high affinity.
  • the antibody can bind CD25 with a KD equal to or less than about 10 "6 M, such as 1 x 10 10- , 10 "8 , 10- 9 .10 “10 , 10 “11 , 10 "12 , 10- 13 or 10 14 .
  • Antibody fragments comprise a portion of a full length antibody, generally the antigen binding or variable region thereof.
  • Examples of antibody fragments include Fab, Fab', F(ab')2, and scFv fragments; diabodies; linear antibodies; fragments produced by a Fab expression library, anti-idiotypic (anti-Id) antibodies, CDR (complementary determining region), and epitope-binding fragments of any of the above which immunospecifically bind to cancer cell antigens, viral antigens or microbial antigens, single-chain antibody molecules; and multispecific antibodies formed from antibody fragments.
  • the term "monoclonal antibody” as used herein refers to an antibody obtained from a population of substantially homogeneous antibodies, i.e.
  • Monoclonal antibodies are highly specific, being directed against a single antigenic site. Furthermore, in contrast to polyclonal antibody preparations which include different antibodies directed against different determinants (epitopes), each monoclonal antibody is directed against a single determinant on the antigen. In addition to their specificity, the monoclonal antibodies are advantageous in that they may be
  • the modifier "monoclonal” indicates the character of the antibody as being obtained from a substantially homogeneous population of antibodies, and is not to be construed as requiring production of the antibody by any particular method.
  • the monoclonal antibodies to be used in accordance with the present disclosure may be made by the hybridoma method first described by Kohler et al (1975) Nature 256:495, or may be made by recombinant DNA methods (see, US 4816567).
  • the monoclonal antibodies may also be isolated from phage antibody libraries using the techniques described in Clackson et al (1991 ) Nature, 352:624-628; Marks et al (1991 ) J. Mol. Biol., 222:581-597 or from transgenic mice carrying a fully human immunoglobulin system (Lonberg (2008) Curr. Opinion 20(4):450-459).
  • the monoclonal antibodies herein specifically include "chimeric" antibodies in which a portion of the heavy and/or light chain is identical with or homologous to corresponding sequences in antibodies derived from a particular species or belonging to a particular antibody class or subclass, while the remainder of the chain(s) is identical with or homologous to corresponding sequences in antibodies derived from another species or belonging to another antibody class or subclass, as well as fragments of such antibodies, so long as they exhibit the desired biological activity (US 4816567; and Morrison et a/ (1984) Proc. Natl. Acad. Sci. USA, 81 :6851 -6855).
  • Chimeric antibodies include "primatized" antibodies comprising variable domain antigen-binding sequences derived from a non- human primate (e.g. Old World Monkey or Ape) and human constant region sequences.
  • an “intact antibody” herein is one comprising VL and VH domains, as well as a light chain constant domain (CL) and heavy chain constant domains, CH1 , CH2 and CH3.
  • the constant domains may be native sequence constant domains (e.g. human native sequence constant domains) or amino acid sequence variant thereof.
  • the intact antibody may have one or more "effector functions" which refer to those biological activities attributable to the Fc region (a native sequence Fc region or amino acid sequence variant Fc region) of an antibody. Examples of antibody effector functions include C1 q binding; complement dependent cytotoxicity; Fc receptor binding; antibody-dependent cell-mediated cytotoxicity (ADCC); phagocytosis; and down regulation of cell surface receptors such as B cell receptor and BCR.
  • intact antibodies can be assigned to different "classes.” There are five major classes of intact antibodies: IgA, IgD, IgE, IgG, and IgM, and several of these may be further divided into “subclasses” (isotypes), e.g., lgG1 , lgG2, lgG3, lgG4, IgA, and lgA2.
  • the heavy-chain constant domains that correspond to the different classes of antibodies are called ⁇ , ⁇ , ⁇ , ⁇ , and ⁇ , respectively.
  • the subunit structures and three-dimensional configurations of different classes of immunoglobulins are well known.
  • the antibodies disclosed herein may be modified. For example, to make them less immunogenic to a human subject. This may be achieved using any of a number of techniques familiar to the person skilled in the art. Some of these techniques are described in more detail below.
  • a “humanized antibody” refers to a polypeptide comprising at least a portion of a modified variable region of a human antibody wherein a portion of the variable region, preferably a portion substantially less than the intact human variable domain, has been substituted by the corresponding sequence from a non-human species and wherein the modified variable region is linked to at least another part of another protein, preferably the constant region of a human antibody.
  • humanized antibodies includes human antibodies in which one or more complementarity determining region ("CDR") amino acid residues and/or one or more framework region ("FW” or “FR”) amino acid residues are substituted by amino acid residues from analogous sites in rodent or other non-human antibodies.
  • CDR complementarity determining region
  • FW framework region
  • FR framework region
  • humanized antibody also includes an immunoglobulin amino acid sequence variant or fragment thereof that comprises an FR having substantially the amino acid sequence of a human immunoglobulin and a CDR having substantially the amino acid sequence of a non- human immunoglobulin.
  • Humanized forms of non-human (e.g., murine) antibodies are chimeric antibodies that contain minimal sequence derived from non-human immunoglobulin. Or, looked at another way, a humanized antibody is a human antibody that also contains selected sequences from non-human (e.g. murine) antibodies in place of the human sequences.
  • a humanized antibody can include conservative amino acid substitutions or non-natural residues from the same or different species that do not significantly alter its binding and/or biologic activity.
  • Such antibodies are chimeric antibodies that contain minimal sequence derived from non- human immunoglobulins.
  • the humanized antibodies are human immunoglobulins (recipient antibody) in which residues from a complementary-determining region (CDR) of the recipient antibody are replaced by residues from a CDR of a non-human species (donor antibody) such as mouse, rat, camel, bovine, goat, or rabbit having the desired properties (in effect, the non- human CDRs are 'grafted' onto the human framework).
  • CDR complementary-determining region
  • donor antibody such as mouse, rat, camel, bovine, goat, or rabbit having the desired properties (in effect, the non- human CDRs are 'grafted' onto the human framework).
  • framework region (FR) residues of the human immunoglobulin are replaced by corresponding non-human residues (this may happen when, for example, a particular FR residue has significant effect on antigen binding).
  • humanized antibodies can comprise residues that are found neither in the recipient antibody nor in the imported CDR or framework sequences. These modifications are made to further refine and maximize antibody performance.
  • a humanized antibody will comprise all of at least one, and in one aspect two, variable domains, in which all or all of the hypervariable loops correspond to those of a non-human immunoglobulin and all or substantially all of the FR regions are those of a human immunoglobulin sequence.
  • the humanized antibody optionally also will comprise at least a portion of an immunoglobulin constant region (Fc), or that of a human immunoglobulin.
  • the method consists of combining the VH or VL domain of a given non-human antibody specific for a particular epitope with a human V H or V L library and specific human V domains are selected against the antigen of interest. This selected human VH is then combined with a VL library to generate a completely human VHxVL combination.
  • the method is described in Nature Biotechnology (N.Y.) 12, (1994) 899-903.
  • two or more segments of amino acid sequence from a human antibody are combined within the final antibody molecule. They are constructed by combining multiple human VH and VL sequence segments in combinations which limit or avoid human T cell epitopes in the final composite antibody V regions. Where required, T cell epitopes are limited or avoided by, exchanging V region segments contributing to or encoding a T cell epitope with alternative segments which avoid T cell epitopes. This method is described in US 2008/0206239 A1 .
  • This method involves the removal of human (or other second species) T-cell epitopes from the V regions of the therapeutic antibody (or other molecule).
  • the therapeutic antibodies V-region sequence is analysed for the presence of MHC class II- binding motifs by, for example, comparison with databases of MHC-binding motifs (such as the "motifs" database hosted at www.wehi.edu.au).
  • MHC class II- binding motifs may be identified using computational threading methods such as those devised by Altuvia et al. (J. Mol. Biol. 249 244-250 (1995)); in these methods, consecutive overlapping peptides from the V-region sequences are testing for their binding energies to MHC class I I proteins.
  • This data can then be combined with information on other sequence features which relate to successfully presented peptides, such as amphipathicity, Rothbard motifs, and cleavage sites for cathepsin B and other processing enzymes.
  • T-cell epitopes Once potential second species (e.g. human) T-cell epitopes have been identified, they are eliminated by the alteration of one or more amino acids.
  • the modified amino acids are usually within the T-cell epitope itself, but may also be adjacent to the epitope in terms of the primary or secondary structure of the protein (and therefore, may not be adjacent in the primary structure). Most typically, the alteration is by way of substitution but, in some circumstances amino acid addition or deletion will be more appropriate.
  • This method involves:
  • step (c) defining for the non-human antibody to be humanized, a set of heavy and light chain surface exposed amino acid residues using the set of framework positions generated in step (b);
  • step (d) identifying from human antibody amino acid sequences a set of heavy and light chain surface exposed amino acid residues that is most closely identical to the set of surface exposed amino acid residues defined in step (c), wherein the heavy and light chain from the human antibody are or are not naturally paired;
  • step (e) substituting, in the amino acid sequence of the non-human antibody to be humanized, the set of heavy and light chain surface exposed amino acid residues defined in step (c) with the set of heavy and light chain surface exposed amino acid residues identified in step (d);
  • step (f) constructing a three-dimensional model of the variable region of the non-human antibody resulting from the substituting specified in step (e);
  • step (h) changing any residues identified in step (g) from the human to the original non- human amino acid residue to thereby define a non-human antibody humanizing set of surface exposed amino acid residues; with the proviso that step (a) need not be conducted first, but must be conducted prior to step (g).
  • the method compares the non-human sequence with the functional human germline gene repertoire. Those human genes encoding canonical structures identical or closely related to the non-human sequences are selected. Those selected human genes with highest homology within the CDRs are chosen as FR donors. Finally, the non-human CDRs are grafted onto these human FRs. This method is described in patent WO 2005/079479 A2.
  • This method compares the non-human (e.g. mouse) sequence with the repertoire of human germline genes and the differences are scored as Human String Content (HSC) that quantifies a sequence at the level of potential MHC/T-cell epitopes.
  • HSC Human String Content
  • the target sequence is then humanized by maximizing its HSC rather than using a global identity measure to generate multiple diverse humanized variants (described in Molecular Immunology, 44, (2007) 1986-1998).
  • the CDRs of the non-human antibody are fused in-frame to cDNA pools encompassing all known heavy and light chain human germline gene frameworks. Humanised antibodies are then selected by e.g. panning of the phage displayed antibody library. This is described in Methods 36, 43-60 (2005).
  • the pharmaceutically acceptable cation may be inorganic or organic.
  • Examples of pharmaceutically acceptable monovalent inorganic cations include, but are not limited to, alkali metal ions such as Na ' and K + .
  • Examples of pharmaceutically acceptable divalent inorganic cations include, but are not limited to, alkaline earth cations such as Ca 2+ and Mg 2 '.
  • Examples of pharmaceutically acceptable organic cations include, but are not limited to, ammonium ion (i.e. NH 4 + ) and substituted ammonium ions (e.g. NH 3 R', NH2R2' , NHR 3 + , NR 4 + ).
  • Examples of some suitable substituted ammonium ions are those derived from: ethylamine, diethylamine, dicyclohexylamine, triethylamine, butylamine,
  • phenyibenzyiamine choline, meglumine, and tromethamine, as well as amino acids, such as lysine and arginine.
  • amino acids such as lysine and arginine.
  • An example of a common quaternary ammonium ion is N(CH 3 ) 4 + .
  • C1-12 alkyl refers to a monovalent moiety obtained by removing a hydrogen atom from a carbon atom of a hydrocarbon compound having from 1 to 12 carbon atoms, which may be aliphatic or alicyclic, and which may be saturated or unsaturated (e.g. partially unsaturated, fully unsaturated).
  • Ci- 4 alkyl as used herein, pertains to a monovalent moiety obtained by removing a hydrogen atom from a carbon atom of a hydrocarbon compound having from 1 to 4 carbon atoms, which may be aliphatic or alicyclic, and which may be saturated or unsaturated (e.g. partially unsaturated, fully unsaturated).
  • alky includes the sub-classes alkenyl, alkynyl, cycloalkyi, etc., discussed below.
  • saturated a Iky I groups include, but are not limited to, methyl (Ci ), ethyl (C2), propyl (C 3 ), butyl (C 4 ), pentyl (C 5 ), hexyl (C 6 ) and heptyl (C 7 ).
  • saturated linear alkyl groups include, but are not limited to, methyl (Ci ), ethyl (C2), n-propyl (C3), n-butyl (C 4 ), n-pentyl (amyl) (C5), n-hexyl (Ce) and n-heptyl (C 7 ).
  • saturated branched alkyl groups include iso-propyl (C3), iso-butyl (C 4 ), sec-butyl (C 4 ), tert-butyl (C 4 ), iso-pentyl (C5), and neo-pentyl (C5).
  • C2-12 Alkenyl The term "C2-12 alkenyl" as used herein, pertains to an alkyl group having one or more carbon-carbon double bonds.
  • C2-12 alkynyl The term "C2-12 alkynyl" as used herein, pertains to an alkyl group having one or more carbon-carbon triple bonds.
  • unsaturated alkynyl groups include, but are not limited to, ethynyl (-C ⁇ CH) and 2-propynyl (propargyl, -CH2-C ⁇ CH).
  • C3-12 cycloalkyi refers to an alkyl group which is also a cyclyl group; that is, a monovalent moiety obtained by removing a hydrogen atom from an alicyclic ring atom of a cyclic hydrocarbon (carbocyclic) compound, which moiety has from 3 to 7 carbon atoms, including from 3 to 7 ring atoms.
  • cycloalkyi groups include, but are not limited to, those derived from:
  • norcarane (C7) norpinane (C/), norbornane (C7).
  • C3-20 heterocyclyl refers to a monovalent moiety obtained by removing a hydrogen atom from a ring atom of a heterocyclic compound, which moiety has from 3 to 20 ring atoms, of which from 1 to 10 are ring heteroatoms.
  • each ring has from 3 to 7 ring atoms, of which from 1 to 4 are ring heteroatoms.
  • the prefixes e.g. C3-20, C3-7, Cs-e, etc.
  • the term "Cs-eheterocyclyl”, as used herein, pertains to a heterocyclyl group having 5 or 6 ring atoms.
  • monocyclic heterocyclyl groups include, but are not limited to, those derived from:
  • Ni aziridine (C3), azetidine (C 4 ), pyrrolidine (tetrahydropyrrole) (C5), pyrroline (e.g.,
  • CM oxirane (C3), oxetane (C 4 ), oxolane (tetrahydrofuran) (C5), oxole (dihydrofuran) (Cs), oxane (tetrahydropyran) (Ce), dihydropyran (Ce), pyran (Ce), oxepin (C7);
  • O2 dioxolane (C5), dioxane (Ce), and dioxepane (C7);
  • N1O1 tetrahydrooxazole (C5), dihydrooxazole (C5), tetrahydroisoxazole (C5),
  • dihydroisoxazole C5
  • morpholine Ce
  • tetrahydrooxazine Ce
  • dihydrooxazine Ce
  • oxazine Ce
  • N1S1 thiazoline (C5), thiazolidine (C5), thiomorpholine (Ce);
  • N2O1 oxadiazine (Ce);
  • O1 S1 oxathiole (Cs) and oxathiane (thioxane) (Ce); and,
  • N1O1S1 oxathiazine (Ce).
  • substituted monocyclic heterocyclyl groups include those derived from saccharides, in cyclic form, for example, fura noses (C5), such as arabinofuranose, lyxofuranose, ribofuranose, and xylofuranse, and pyranoses (Ce), such as allopyranose, altropyranose, glucopyranose, mannopyranose, gulopyranose, idopyranose,
  • C5-20 aryl The term "C5-20 aryl", as used herein, pertains to a monovalent moiety obtained by removing a hydrogen atom from an aromatic ring atom of an aromatic compound, which moiety has from 3 to 20 ring atoms.
  • C5-7 aryl refers to a monovalent moiety obtained by removing a hydrogen atom from an aromatic ring atom of an aromatic compound, which moiety has from 5 to 7 ring atoms
  • C5-10 aryl pertains to a monovalent moiety obtained by removing a hydrogen atom from an aromatic ring atom of an aromatic compound, which moiety has from 5 to 10 ring atoms.
  • each ring has from 5 to 7 ring atoms.
  • the prefixes e.g. C3-20, C5-7, Cs-e, C5-10, etc.
  • the prefixes denote the number of ring atoms, or range of number of ring atoms, whether carbon atoms or heteroatoms.
  • the term "C5-6 aryl” as used herein, pertains to an aryl group having 5 or 6 ring atoms.
  • the ring atoms may be all carbon atoms, as in "carboaryl groups".
  • carboaryl groups include, but are not limited to, those derived from benzene (i.e. phenyl) (Ce), naphthalene (C10), azulene (C10), anthracene (C14), phenanthrene (C14), naphthacene (Cie), and pyrene (Cie).
  • benzene i.e. phenyl
  • C10 naphthalene
  • azulene C10
  • anthracene C14
  • phenanthrene C14
  • naphthacene Cie
  • pyrene pyrene
  • aryl groups which comprise fused rings include, but are not limited to, groups derived from indane (e.g. 2,3-dihydro-1 H-indene) (Cg), indene (Co), isoindene (Cg), tetraline (1 ,2.3,4-tetrahydronaphthalene (C10),
  • indane e.g. 2,3-dihydro-1 H-indene
  • indene Co
  • isoindene Cg
  • tetraline (1 ,2.3,4-tetrahydronaphthalene (C10)
  • the ring atoms may include one or more heteroatoms, as in "heteroaryl groups".
  • heteroaryl groups include, but are not limited to, those derived from: Ni: pyrrole (azole) (C5), pyridine (azine) (Co);
  • N1O1 oxazole (Cs), isoxazole (C5), isoxazine (Ce);
  • N2O1 oxadiazole (furazan) (C5);
  • N3O1 oxatriazole (C5);
  • N1S1 thiazole (C5), isothiazole (C5);
  • heteroaryl which comprise fused rings, include, but are not limited to:
  • Ci3 (with 3 fused rings) derived from carbazole (Ni ), dibenzofuran (O1 ),
  • dibenzothiophene Si
  • carboline N2
  • perimidine N2
  • pyridoindole N2
  • Ci (with 3 fused rings) derived from acridine (Ni), xanthene (O1 ), thioxanthene (Si), oxanthrene (O2), phenoxathiin (O1S1 ), phenazine (N2), phenoxazine (N1O1 ), phenothiazine (N1S1 ), thianthrene (S2), phenanthridine (Ni), phenanthroline (N2), phenazine (N2).
  • the above groups, whether alone or part of another substituent, may themselves optionally be substituted with one or more groups selected from themselves and the additional substituents listed below.
  • Halo -F, -CI, -Br, and -I .
  • R is an ether substituent, for example, a C1-7 alkyl group (also referred to as a C1-7 alkoxy group, discussed below), a C3-20 heterocyclyl group (also referred to as a C3-20 heterocyclyloxy group), or a C5-20 aryl group (also referred to as a C5-20 aryloxy group), preferably a Cwalkyl group.
  • R is an ether substituent, for example, a C1-7 alkyl group (also referred to as a C1-7 alkoxy group, discussed below), a C3-20 heterocyclyl group (also referred to as a C3-20 heterocyclyloxy group), or a C5-20 aryl group (also referred to as a C5-20 aryloxy group), preferably a Cwalkyl group.
  • Alkoxy -OR, wherein R is an alkyl group, for example, a C1 -7 alkyl group.
  • C1-7 alkoxy groups include, but are not limited to, -OMe (methoxy), -OEt (ethoxy), -O(nPr) (n- propoxy), -O(iPr) (isopropoxy), -O(nBu) (n-butoxy), -O(sBu) (sec-butoxy), -O(iBu)
  • Acetal -CH(OR 1 )(OR 2 ), wherein R 1 and R 2 are independently acetal substituents, for example, a Cw alkyl group, a C3-20 heterocyclyl group, or a C5-20 aryl group, preferably a C1-7 alkyl group, or, in the case of a "cyclic" acetal group, R 1 and R 2 , taken together with the two oxygen atoms to which they are attached, and the carbon atoms to which they are attached, form a heterocyclic ring having from 4 to 8 ring atoms.
  • acetal groups include, but are not limited to, -CH(OMe) 2 , -CH(OEt) 2 , and -CH(OMe)(OEt).
  • Hemiacetal -CH(OH)(OR 1 ), wherein R 1 is a hemiacetal substituent, for example, a C1-7 alkyl group, a C3-20 heterocyclyl group, or a C.3 ⁇ 4-2o aryl group, preferably a C1-7 alkyl group.
  • hemiacetal groups include, but are not limited to, -CH(OH)(OMe) and - CH(OH)(OEt).
  • Ketal -CR(OR 1 )(OR 2 ), where R 1 and R 2 are as defined for acetals, and R is a ketal substituent other than hydrogen, for example, a C1-7 alkyl group, a C3-20 heterocyclyl group, or a C5-20 aryl group, preferably a C1 -7 alkyl group.
  • ketal groups include, but are not limited to, -C(Me)(OMe) 2 , -C(Me)(OEt) 2 , -C(Me)(OMe)(OEt), -C(Et)(OMe) 2 , -C(Et)(OEt) 2 , and -C(Et)(OMe)(OEt).
  • R 1 is as defined for hemiacetals, and R is a h em i ketal substituent other than hydrogen, for example, a C1-7 alkyl group, a C3-20 heterocyclyl group, or a C5-20 aryl group, preferably a C1-7 alkyl group.
  • hemiacetal groups include, but are not limited to, -C(Me)(OH)(OMe), -C(Et)(OH)(OMe), -C(Me)(OH)(OEt), and
  • Imino (imine): NR, wherein R is an imino substituent, for example, hydrogen, Ci- aikyl group, a C3-20 heterocyciyi group, or a C5-2o aryl group, preferably hydrogen or a C1-7 alkyl group.
  • R is an acyl substituent, for example, a C1-7 alkyl group (also referred to as Ci-/ alkylacyl or d./ alkanoyl), a C3-20 heterocyciyi group (also referred to as C3-20 heterocyclylacyl), or a C5-20 aryl group (also referred to as C5-20 arylacyl), preferably a C1-7 alkyl group.
  • Carboxy (carboxylic acid): -C( 0)OH.
  • Thiocarboxy (thiocarboxylic acid): -C( S)SH .
  • Acyloxy (reverse ester): -OC( 0)R, wherein R is an acyloxy substituent, for example, a C1-7 alkyl group, a C3-20 heterocyciyi group, or a C 5-20 aryl group, preferably a C1-7 alkyl group.
  • R is an acyloxy substituent, for example, a C1-7 alkyl group, a C3-20 heterocyciyi group, or a C 5-20 aryl group, preferably a C1-7 alkyl group.
  • Oxycarboyloxy: -OC( 0)OR, wherein R is an ester substituent, for example, a Ci- alkyl group, a C3-20 heterocyclyl group, or a Cs-2o aryi group, preferably a C1-7 alkyl group.
  • R 1 and R 2 are independently amino substituents, for example, hydrogen, a C1-7 alkyl group (also referred to as Ci./ alkylamino or di-d./ alkylamino), a C3-20 heterocyclyl group, or a C5-20 aryl group, preferably H or a C1-7 alkyl group, or, in the case of a "cyclic" amino group, R 1 and R 2 , taken together with the nitrogen atom to which they are attached, form a heterocyclic ring having from 4 to 8 ring atoms.
  • R 1 and R 2 are independently amino substituents, for example, hydrogen, a C1-7 alkyl group (also referred to as Ci./ alkylamino or di-d./ alkylamino), a C3-20 heterocyclyl group, or a C5-20 aryl group, preferably H or a C1-7 alkyl group, or, in the case of a "cyclic" amino group, R 1 and R 2 ,
  • Amino groups may be primary (-NH2), secondary (-NHR 1 ), or tertiary (-NHR 1 R 2 ), and in cationic form, may be quaternary (-' NR 1 R 2 R 3 ).
  • Examples of amino groups include, but are not limited to, -NH 2 ,
  • cyclic amino groups include, but are not limited to, aziridino, azetidino, pyrrolidino, piperidino, piperazino, morpholino, and thiomorpholino.
  • Amido (carbamoyl, carbamyi, aminocarbonyl, carboxamide): -C( 0)NR R 2 , wherein R 1 and R 2 are independently amino substituents, as defined for amino groups.
  • Thioamido (thiocarbamyl): -C( S)NR 1 R 2 , wherein R 1 and R 2 are independently amino substituents, as defined for amino groups.
  • R 1 is an amide substituent, for example, hydrogen, a Ci-/ alkyl group, a C3-20 heterocyclyl group, or a C5-2o aryl group, preferably hydrogen or a C1-7 alkyl group
  • R 2 is an acyl substituent, for example, a C1-7 alkyl group, a C3-20 heterocyclyl group, or a Cs-2oaryl group, preferably
  • R 1 and R 2 may together form a cyclic structure, as in, f r example, succinimidyl, maleimidyl, and phthalimidyl:
  • R 2 and R 3 are independently amino substituents, as defined for amino groups, and R 1 is a ureido substituent, for example, hydrogen, a Ci-/ alkyl group, a C.3- 2 o heterocyclyl group, or a Cs- 2 o aryl group, preferably hydrogen or a Ci-/ alkyl group.
  • ureido groups include, but are not limited to, -NHCONH 2 , -NHCON HMe, -NHCONHEt, -NHCONMe 2 , -NHCON Et , -NMeCONH 2 , -NMeCONHMe, -NMeCONHEt, - NMeCONMe 2 , and -NMeCONEt 2 .
  • TetrazoiyI a five membered aromatic ring having four nitrogen atoms and one carbon atom
  • Imino: NR, wherein R is an imino substituent, for example, for example, hydrogen, a C1-7 alkyl group, a C3- 2 o heterocyclyl group, or a C5- 2 o aryl group, preferably H or a Ci-/alkyl group.
  • C1.7 alkylt.hio groups include, but are not limited to, Disulfide: -SS-R, wherein R is a disulfide substituent, for example, a Ci- alkyl group, a C3-20 heterocyclyl group, or a C5-20 aryl group, preferably a C1-7 alkyl group (also referred to herein as C1-7 alkyl disulfide).
  • R is a disulfide substituent, for example, a Ci- alkyl group, a C3-20 heterocyclyl group, or a C5-20 aryl group, preferably a C1-7 alkyl group (also referred to herein as C1-7 alkyl disulfide).
  • Sulfone (sulfonyl): -S( 0)2R, wherein R is a sulfone substituent, for example, a C1-7 alkyl group, a C3-20 heterocyclyl group, or a Can ary I group, preferably a C1-7 alkyl group, including, for example, a fluorinated or perfluorinated C1-7 alkyl group.
  • Sulfonate (sulfonic acid ester): -S( 0)20R, wherein R is a sulfonate substituent, for example, a C1-7 alkyl group, a C3-20 heterocyclyl group, or a C5-20 aryl group, preferably a C1-7 alkyl group.
  • R is a sulfonate substituent, for example, a C1-7 alkyl group, a C3-20 heterocyclyl group, or a C5-20 aryl group, preferably a C1-7 alkyl group.
  • Sulfate: -OS( 0)20R; wherein R is a sulfate substituent, for example, a C1-7 alkyl group, a C3-20 heterocyclyl group, or a Cs-2o aryl group, preferably a C1-7 alkyl group.
  • R is a sulfate substituent, for example, a C1-7 alkyl group, a C3-20 heterocyclyl group, or a Cs-2o aryl group, preferably a C1-7 alkyl group.
  • R 1 and R 2 are independently amino substituents, as defined for amino groups.
  • R 1 and R 2 are independently amino substituents, as defined for amino groups.
  • R 1 is an amino substituent, as defined for amino groups.
  • R 1 is an amino substituent, as defined for amino groups
  • R is a sulfonamino substituent, for example, a Cw alkyl group, a C 3 . 2 o heterocyclyl group, or a C5-20 aryl group, preferably a Ci- alkyl group.
  • R 1 is an amino substituent, as defined for amino groups
  • R is a sulfinamino substituent, for example, a Ci-/ alkyl group, a C 3-2 o heterocyclyl group, or a C5- 2 o aryl group, preferably a C1-7 alkyl group.
  • Examples of phosphino groups include, but are not limited to, -PH 2 , -P(CH 3 ) 2 , -P(CH 2 CH 3 ) 2 , -P(t-Bu) 2 , and -P(Ph) 2 .
  • Phosphonic acid (phosphono): -P( 0)(OH) 2 .
  • Phosphonate (phosphono ester): -P( 0)(OR)2, where R is a phosphonate substituent, for example, -H, a Ch alky!
  • Phosphate (phosphonooxy ester): -OP( 0)(OR)2, where R is a phosphate substituent, for example, -H, a C1-7 aikyl group, a C3-20 heterocyclyi group, or a Cs.2o aryl group, preferably -H, a C1-7 aikyl group, or a C5-20 aryl group.
  • R is a phosphate substituent, for example, -H, a C1-7 aikyl group, a C3-20 heterocyclyi group, or a Cs.2o aryl group, preferably -H, a C1-7 aikyl group, or a C5-20 aryl group.
  • Phosphorous acid -OP(OH) 2 .
  • Phosphite -OP(OR)2, where R is a phosphite substituent, for example, -H, a C1-7 aikyl group, a C3-20 heterocyclyi group, or a C;,.2o aryl group, preferably -H, a C1-7 aikyl group, or a C5-20 aryl group.
  • Examples of phosphite groups include, but are not limited to, -OP(OCH 3 ) 2 ,
  • Phosphoramidite -OP(OR 1 )-NR 2 2, where R 1 and R 2 are phosphoramidite substituents, for example, -H, a (optionally substituted) C1-7 aikyl group, a C 3 -2o heterocyclyi group, or a C5-20 aryl group, preferably -H, a C1-7 aikyl group, or a C5.20 aryl group. Examples of
  • phosphoramidite groups include, but are not limited to, -OP(OCH 2 CH 3 )-N(CH 3 ) 2 ,
  • R 1 and R 2 are phosphoramidate substituents, for example, -H, a (optionally substituted) C1.7 aikyl group, a C.3-20 heterocyclyi group, or a C5-20 aryl group, preferably -H, a C1-7 aikyl group, or a C5-20 aryl group.
  • Examples of phosphoramidate groups include, but are not limited to,
  • C 3 -12 alkylene refers to a bidentate moiety obtained by removing two hydrogen atoms, either both from the same carbon atom, or one from each of two different carbon atoms, of a hydrocarbon compound having from 3 to 12 carbon atoms (unless otherwise specified), which may be aliphatic or alicyclic, and which may be saturated, partially unsaturated, or fully unsaturated.
  • alkylene includes the sub-classes alkenylene, alkynylene, cycloalkylene, etc., discussed below.
  • linear saturated C3-12 alkylene groups include, but are not limited to, -(Ch )n- where n is an integer from 3 to 12, for example, -CH2CH2CH2- (propylene),
  • branched saturated C3-12 alkylene groups include, but are not limited to, -CH(CH 3 )CH 2 -, -CH(CH 3 )CH 2 CH 2 -, -CH(CH 3 )CH 2 CH 2 CH2-, -CH 2 CH(CH 3 )CH 2 -,
  • -CH CH-CH(CH 3 )- and -C ⁇ C-CH(CH 3 )-.
  • C 3- 12 cycloalkylenes examples include, but are not limited to, cyclopentylene (e.g. cyclopent-1 ,3-ylene), and cyclohexylene
  • C.3-12 cycloalkylenes examples include, but are not limited to, cyclopentenylene (e.g. 4-cyclopenten-1 ,3-ylene),
  • cyclohexenylene e.g. 2-cyclohexen-1 ,4-ylene; 3-cyclohexen-1 ,2-ylene; 2,5-cyclohexadien- 1 ,4-ylene).
  • Carbamate nitrogen protecting group pertains to a moiety which masks the nitrogen in the imine bond, and these are well known in the art. These groups have the following structure:
  • R' 10 is R as defined above.
  • suitable groups are described on pages 503 to 549 of Greene, T.W. and Wuts, G.M., Protective Groups in Organic Synthesis, 3 rd Edition, John Wiley & Sons, Inc., 1999, which is incorporated herein by reference.
  • Hemi-aminal nitrogen protecting group pertains to a group having the following structure: wherein R' 10 is R as defined above.
  • R' 10 is R as defined above.
  • suitable groups are described on pages 633 to 647 as amide protecting groups of Greene, T.W. and Wuts, G.M., Protective Groups in Organic Synthesis, 3 rd Edition, John Wiley & Sons, Inc., 1999, which is
  • the groups Carbamate nitrogen protecting group and Hemi-aminal nitrogen protecting group may be jointly termed a "nitrogen protecting group for synthesis”.
  • the present disclosure relates to a conjugate comprising a PBD compound connected to the antibody via a Linker Unit.
  • the linker is a cleavable linker, as described herein.
  • a cleavable linker may be stable extracellularly, but cleaved at some efficacious rate inside the cell.
  • the linker is a non-cleavable linker.
  • a non- cleavable linker is typically stable extracellularly and stable intracellular ⁇ .
  • Example non- cleavable linkers include those described in the alternative aspect of the disclosure, such as those having the linkers L1 , L2, or L3.
  • Non-cleavable linkers are typically resistant to cleavage by the action of enzymes, and may also be resistant to changes in pH (e.g.
  • the conjugate comprises the antibody connected to a spacer connecting group, the spacer connected to a trigger, the trigger connected to a self-immolative linker, and the self-immolative linker connected to the N10 position of the PBD compound.
  • a conjugate is illustrated below:
  • R l may be either R 11' or R L2' .
  • D is D l with R i r or R L2' removed.
  • the conjugate allows the release of an active PBD compound that does not retain any part of the linker. There is no stub present that could affect the reactivity of the PBD compound.
  • the linker attaches the antibody to the PBD drug moiety D through covalent bond(s).
  • the linker is a bifunctional or multifunctional moiety which can be used to link one or more drug moiety (D) and an antibody unit (Ab) to form antibody-drug conjugates (ADC).
  • the linker (R l ) may be stable outside a cell, i.e. extracellular, or it may be cleavable by enzymatic activity, hydrolysis, or other metabolic conditions.
  • Antibody-drug conjugates can be conveniently prepared using a linker having reactive functionality for binding to the drug moiety and to the antibody.
  • a cysteine thiol, or an amine, e.g. N-terminus or amino acid side chain such as lysine, of the antibody (Ab) can form a bond with a functional group of a linker or spacer reagent, PBD drug moiety (D) or drug-linker reagent (D L , D -R L ), where R L can be R L1 or R 12 .
  • the linkers of the ADC preferably prevent aggregation of ADC molecules and keep the ADC freely soluble in aqueous media and in a monomeric state.
  • the linkers of the ADC are preferably stable extracellularly.
  • the antibody-drug conjugate (ADC) is preferably stable and remains intact, i.e. the antibody remains linked to the drug moiety.
  • the linkers are stable outside the target cell and may be cleaved at some efficacious rate inside the cell.
  • An effective linker will: (i) maintain the specific binding properties of the antibody; (ii) allow intracellular delivery of the conjugate or drug moiety; (iii) remain stable and intact, i.e.
  • Stability of the ADC may be measured by standard analytical techniques such as mass spectroscopy, HPLC, and the
  • bivalent linker reagents which are useful to attach two or more functional or biologically active moieties, such as peptides, nucleic acids, drugs, toxins, antibodies, haptens, and reporter groups are known, and methods have been described their resulting conjugates (Hermanson, G.T. (1996)
  • the linker may be substituted with groups which modulate aggregation, solubility or reactivity.
  • a sulfonate substituent may increase water solubility of the reagent and facilitate the coupling reaction of the linker reagent with the antibody or the drug moiety, or facilitate the coupling reaction of Ab-L with D' , or D L -L with Ab, depending on the synthetic route employed to prepare the ADC.
  • L-R L is a g
  • Ab is the antibody (L)
  • L 1 is a linker
  • A is a connecting group connecting L 1 to the antibody
  • L 1 or L 2 is a cleavable linker.
  • L 1 is preferably the cleavable linker, and may be referred to as a trigger for activation of the linker for cleavage.
  • the nature of L 1 and L 2 can vary widely. These groups are chosen on the basis of their cleavage characteristics, which may be dictated by the conditions at the site to which the conjugate is delivered. Those linkers that are cleaved by the action of enzymes are preferred, although linkers that are cleavable by changes in pH (e.g. acid or base labile), temperature or upon irradiation (e.g. photolabile) may also be used. Linkers that are cleavable under reducing or oxidising conditions may also find use in the present disclosure.
  • L 1 may comprise a contiguous sequence of amino acids.
  • the amino acid sequence may be the target substrate for enzymatic cleavage, thereby allowing release of L-R 1 ' from the N10 position.
  • L 1 is cleavable by the action of an enzyme.
  • the enzyme is an esterase or a peptidase.
  • L 2 is a substrate for enzymatic activity, thereby allowing release of L-R 1 ' from the N10 position.
  • the enzyme cleaves the bond between L 1 and L 2 .
  • L 1 and L 2 where present, may be connected by a bond selected from:
  • An amino group of L 1 that connects to L 2 may be the N-terminus of an amino acid or may be derived from an amino group of an amino acid side chain, for example a lysine amino acid side chain.
  • a carboxyl group of L 1 that connects to L 2 may be the C-terminus of an amino acid or may be derived from a carboxyl group of an amino acid side chain, for example a glutamic acid amino acid side chain.
  • a hydroxyl group of L 1 that connects to L 2 may be derived from a hydroxyl group of an amino acid side chain, for example a serine amino acid side chain.
  • amino acid side chain includes those groups found in: (i) naturally occurring amino acids such as alanine, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, and valine; (ii) minor amino acids such as ornithine and citrulline; (iii) unnatural amino acids, beta-amino acids, synthetic analogs and derivatives of naturally occurring amino acids; and (iv) all enantiomers, diastereomers, isomerically enriched, isotopically labelled (e.g. 2 H, 3 H, 14 C, 15 N), protected forms, and racemic mixtures thereof.
  • naturally occurring amino acids such as alanine, arginine, asparagine, aspartic acid, cysteine, glutamine
  • the phenylene ring is optionally substituted with one, two or three substituents as described herein. In one embodiment, the phenylene group is optionally substituted with halo. N0 2 , R or OR. In one embodiment, Y is NH.
  • n is 0 or 1 .
  • n is 0.
  • the self-immolative linker may be referred to as a
  • PABC p-aminobenzylcarbonyl linker
  • L * is the activated form of the remaining portion of the linker.
  • the group L * is a linker L 1 as described herein, which may include a dipeptide group.
  • E is O, S or NR
  • D is N, CH, or CR
  • F is N, CH, or CR.
  • D is N.
  • D is CH.
  • E is O or S.
  • F is CH.
  • the linker is a cathepsin labile linker.
  • L 1 comprises a dipeptide
  • the dipeptide may be represented as - H-X1-X2-CO-, where -NH- and -CO- represent the N- and C-terminals of the amino acid groups Xi and X2 respectively.
  • the amino acids in the dipeptide may be any combination of natural amino acids.
  • the linker is a cathepsin labile linker
  • the dipeptide may be the site of action for cathepsin-mediated cleavage.
  • CO and NH may represent that side chain
  • the group -X1-X2- in dipeptide, -NH-X1-X2-CO- is selected from:
  • the group -X1-X2- in dipeptide, -NH-X1-X2-CO- is selected from:
  • the group -X1-X2- in dipeptide, -NH-X1-X2-CO-, is -Phe-Lys- or -Val-Ala-.
  • dipeptide combinations may be used, including those described by Dubowchik et al., Bioconjugate Chemistry, 2002, 13.855-869, which is incorporated herein by reference.
  • the amino acid side chain is derivatised, where appropriate.
  • an amino group or carboxy group of an amino acid side chain may be derivatised.
  • an amino group NH 2 of a side chain amino acid, such as lysine is a derivatised form selected from the group consisting of NHR and NRR'.
  • a carboxy group COOH of a side chain amino acid is a derivatised form selected from the group consisting of COOR, CONH2, CONHR and CONRR * .
  • the amino acid side chain is chemically protected, where appropriate.
  • the side chain protecting group may be a group as discussed below in relation to the group R L .
  • the present inventors have established that protected amino acid sequences are cleavable by enzymes. For example, it has been established that a dipeptide sequence comprising a Boc side chain-protected Lys residue is cleavable by cathepsin.
  • Protecting groups for the side chains of amino acids are well known in the art and are described in the Novabiochem Catalog. Additional protecting group strategies are set out in Protective Groups in Organic Synthesis, Greene and Wuts.
  • Lys Boc, Z-CI, Fmoc, Z, Alloc;
  • the side chain protection is selected to be orthogonal to a group provided as, or as part of, a capping group, where present.
  • the removal of the side chain protecting group does not remove the capping group, or any protecting group functionality that is part of the capping group.
  • the amino acids selected are those having no reactive side chain functionality.
  • the amino acids may be selected from: Ala, Gly, lie, Leu, Met, Phe, Pro, and Val.
  • the dipeptide is used in combination with a self-immolative linker.
  • the self-immolative linker may be connected to -X 2 -.
  • -X2- is connected directly to the self-immolative linker.
  • the group -X2-CO- is connected to Y, where Y is NH, thereby forming the group -X2-CO-NH-.
  • A may comprise the functionality -CO- thereby to form an amide link with -X1-.
  • NH-X1-X2-CO-PABC- The PABC group is connected directly to the N10 position.
  • the self-immolative linker and the dipeptide together form the group -NH-Phe- Lys-CO-NH-PABC-, which is illustrated below:
  • the asterisk indicates the point of attachment to the N10 position
  • the wavy line indicates the point of attachment to the remaining portion of the linker L 1 or the point of attachment to A.
  • the wavy line indicates the point of attachment to A.
  • the side chain of the Lys amino acid may be protected, for example, with Boc, Fmoc, or Alloc, as described above.
  • the self-immolative linker and the dipeptide together form the group
  • the self-immolative linker and the dipeptide together form the group
  • A is a covalent bond.
  • L 1 and the antibody are directly connected.
  • L 1 comprises a contiguous amino acid sequence
  • the N-terminus of the sequence may connect directly to the antibody.
  • A is a covalent bond
  • the connection between the antibody and L 1 may be selected from:
  • An amino group of L 1 that connects to the antibody may be the N-terminus of an amino acid or may be derived from an amino group of an amino acid side chain, for example a lysine amino acid side chain.
  • An carboxyl group of L 1 that connects to the antibody may be the C-terminus of an amino acid or may be derived from a carboxyl group of an amino acid side chain, for example a glutamic acid amino acid side chain.
  • a hydroxyi group of L 1 that connects to the antibody may be derived from a hydroxyi group of an amino acid side chain, for example a serine amino acid side chain.
  • a thiol group of L 1 that connects to the antibody may be derived from a thiol group of an amino acid side chain, for example a serine amino acid side chain.
  • n 0 to 3
  • Y is a covalent bond or a functional group
  • E is an activatable group, for example by enzymatic action or light, thereby to generate a self-immolative unit.
  • the phenylene ring is optionally further substituted with one, two or three substituents as described herein.
  • the phenylene group is optionally further substituted with halo, NO2, R or OR.
  • n is 0 or 1 , most preferably 0.
  • E is selected such that the group is susceptible to activation, e.g. by light or by the action of an enzyme.
  • E may be -NO2 or glucoronic acid.
  • the former may be susceptible to the action of a nitroreductase, the latter to the action of a ⁇ -glucoronidase.
  • E * is the activated form of E
  • Y is as described above.
  • the group Y may be a covalent bond to L 1 .
  • the group Y may be a functional group selected from
  • L 1 is a dipeptide
  • the dipeptide sequence need not be a substrate for an enzymatic activity.
  • A is a spacer group.
  • L 1 and the antibody are indirectly connected.
  • L 1 and A may be connected by a bond selected from:
  • the group A is:
  • n 0 to 6. In one embodiment, n is 5. In one embodiment, the group A is:
  • n is 0 to 6. In one embodiment, n is 5.
  • the group A is:
  • n is 0 or 1
  • m is 0 to 30.
  • n is 1 and m is 0 to 10, 1 to 8, preferably 4 to 8, and most preferably 4 or 8.
  • m is 10 to 30, and preferably 20 to 30.
  • m is 0 to 50.
  • m is preferably 10-40 and n is 1.
  • the group A is:
  • n is 0 or 1
  • m is 0 to 30.
  • n is 1 and m is 0 to 10. 1 to 8, preferably 4 to 8, and most preferably 4 or 8.
  • m is 10 to 30, and preferably 20 to 30.
  • m is 0 to 50.
  • m is preferably 10-40 and n is 1.
  • connection between the antibody and A is through a thiol residue of the antibody and a maleimide group of A.
  • connection y and A is:
  • the S atom is typically derived from the antibody.
  • the maleimide-derived group is replaced with the group:
  • the maleimide-derived group is replaced with a group, which optionally together with the antibody, is selected from:
  • the maleimide-derived group is replaced with a group, which optionally together with the antibody, is selected from:
  • the wavy line indicates either the point of attachment to the antibody or the bond to the remaining portion of the A group
  • the asterisk indicates the other of the point of attachment to the antibody or the bond to the remaining portion of the A group.
  • the Connecting Group A is present, the Trigger V is present and Self- Immolative Linker L 2 is absent.
  • L 1 and the Drug unit are directly connected via a bond.
  • L 2 is a bond. This may be particularly relevant when D L is of Formula II.
  • L 1 and D may be connected by a bond selected from:
  • L 1 and D are preferably connected by a bond selected from:
  • L 1 comprises a dipeptide and one end of the dipeptide is linked to D.
  • the amino acids in the dipeptide may be any combination of natural amino acids and non-natural amino acids.
  • the dipeptide comprises natural amino acids.
  • the linker is a cathepsin labile linker
  • the dipeptide is the site of action for cathepsin-mediated cleavage. The dipeptide then is a recognition site for cathepsin.
  • the group -Xi-X 2 - in dipeptide, -NH-X1-X2-CO-, is selected from:
  • Cit is citrulline.
  • -NH- is the amino group of Xi
  • CO is the carbonyl group of X2.
  • the group -X1-X2- in dipeptide, -NH-X1-X2-CO- is selected from:
  • the group -X1-X2- in dipeptide, -NH-X1-X2-CO-, is -Phe-Lys- or -Val-Ala-.
  • dipeptide combinations of interest include: -Gly-Gly-.
  • L 1 - D is: where -NH-X1-X2-CO is the dipeptide, -N ⁇ is part of the Drug unit, the asterisk indicates the points of attachment to the remainder of the Drug unit, and the wavy line indicates the point of attachment to the remaining portion of L 1 or the point of attachment to A. Preferably, the wavy line indicates the point of attachment to A.
  • the dipeptide is valine-alanine and L 1 - D is:
  • the dipeptide is phenylalnine-lysine and L 1 - D is:
  • the dipeptide is valine-citrulline.
  • the groups A-L 1 are:
  • n is 0 to 6. In one embodiment, n is 5.
  • the groups A-L 1 are:
  • n is 0 to 6. In one embodiment, n is 5.
  • the groups A-L 1 are:
  • n is 0 or 1
  • m is 0 to 30.
  • n is 1 and m is 0 to 10. 1 to 8, preferably 4 to 8, most preferably 4 or 8.
  • the groups A-L 1 are:
  • n is 0 or 1
  • m is 0 to 30.
  • n is 1 and m is 0 to 10. 1 to 7, preferably 3 to 7, most preferably 3 or 7.
  • the groups A-L 1 are:
  • n 0 to 6. In one embodiment, is 5.
  • the groups A-L 1 are:
  • n 0 to 6. In one embodiment, is 5.
  • the groups A-L 1 are:
  • n 0 or 1
  • m 0 to 30.
  • the groups A-L 1 is:
  • n is 0 or 1
  • m is 0 to 30.
  • n is 1 and m is 0 to 10, 1 to 8, preferably 4 to 8, most preferably 4 or 8.
  • the groups A-L 1 are:
  • n 0 to 6. In one embodiment, n is 5.
  • the group A-L 1 are:
  • n 0 to 6. In one embodiment, n is 5.
  • the groups A -L 1 are:
  • n is 0 or 1
  • m is 0 to 30.
  • n is 1 and m is 0 to 10, 1 to 8, preferably 4 to 8, most preferably 4 or 8.
  • the groups A 1 -L 1 are:
  • n is 0 or 1
  • m is 0 to 30.
  • n is 1 and m is 0 to 10, 1 to 7, preferably 4 to 8, most preferably 4 or 8.
  • the groups A 1 -L 1 are:
  • n is 5.
  • the groups A 1 -L 1 are:
  • n is 5.
  • the groups A 1 -L 1 are:
  • n is 0 or 1
  • m is 0 to 30.
  • n is 1 and m is 0 to 10, 1 to 8, preferably 4 to 8, most preferably 4 or 8.
  • the groups A 1 -L 1 are:
  • n is 0 or 1
  • m is to 30.
  • n is 1 and m is 0 to 10, 1 to 8, preferably 4 to 8, most preferably 4 or 8.
  • the group R L' is derivable from the group R L .
  • the group R L may be converted to a group R L' by connection of an antibody to a functional group of R L .
  • Other steps may be taken to convert R L to R 1 ' . These steps may include the removal of protecting groups, where present, or the installation of an appropriate functional group.
  • Linkers can include protease-cleavabie peptidic moieties comprising one or more amino acid units.
  • Peptide linker reagents may be prepared by solid phase or liquid phase synthesis methods (E. Schroder and K. Lubke, The Peptides, volume 1 , pp 76-136 (1965) Academic Press) that are well known in the field of peptide chemistry, including t-BOC chemistry (Geiser et al "Automation of solid-phase peptide synthesis" in Macromolecular Sequencing and Synthesis, Alan R. Liss, Inc., 1988, pp. 199-218) and Fmoc/HBTU chemistry (Fields, G. and Noble, R.
  • Exemplary amino acid linkers include a dipeptide, a tri peptide, a tetrapeptide or a penta peptide.
  • Exemplary dipeptides include: valine-citrulline (vc or val-cit), alanine- phenylalanine (af or ala-phe).
  • Exemplary tripeptides include: glycine-valine-citrulline (gly- val-cit) and glycine-glycine-glycine (gly-gly-gly).
  • Amino acid residues which comprise an amino acid linker component include those occurring naturally, as well as minor amino acids and non-naturally occurring amino acid analogs, such as citrulline.
  • Amino acid linker components can be designed and optimized in their selectivity for enzymatic cleavage by a particular enzymes, for example, a tumor-associated protease, cathepsin B, C and D, or a plasmin protease.
  • Amino acid side chains include those occurring naturally, as well as minor amino acids and non-naturally occurring amino acid analogs, such as citrulline.
  • Amino acid side chains include hydrogen, methyl, isopropyl, isobutyl, sec-butyl, benzyl, p-hydroxybenzyl, -CH 2 OH, - CH(OH)CH 3 , -CH2CH2SCH3, -CH2CONH2, -CH2COOH, -CH 2 CH 2 CONH 2 , -CH 2 CH 2 COOH, - -(CH 2 )3NH 2 , -(CH 2 ) 3 NHCOCH 3 , -(CH 2 ) 3 NHCHO, -
  • (CH 2 ) 4 NHC( NH)NH 2 , -(CH 2 ) 4 NH 2 , -(CH 2 ) 4 NHCOCH 3 , -(CH 2 ) 4 NHCHO, -(CH 2 ) 3 NHCONH 2 , - (CH 2 ) 4 NHCONH 2 , -CH 2 CH 2 CH(OH)CH 2 NH , 2-pyridylmethyl-, 3-pyridylmethyl-, 4- pyridylmethyl-, phenyl, cyclohexyl, as well as the following structures:
  • the carbon atom to which the amino acid side chain is attached is chiral.
  • Each carbon atom to which the amino acid side chain is attached is independently in the (S) or (R) configuration, or a racemic mixture.
  • Drug-linker reagents may thus be enantiomerically pure, racemic, or
  • amino acid side chains are selected from those of natural and non-natural amino acids, including alanine, 2-amino-2-cyclohexylacetic acid, 2-amino-2- phenylacetic acid, arginine, asparagine, aspartic acid, cysteine, glutamine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, norleucine, phenylalanine, proline, serine, threonine, tryptophan, tyrosine, valine, y-aminobutyric acid, ⁇ . ⁇ -dimethyl ⁇ - aminobutyric acid, ⁇ . ⁇ -dimethyl y-aminobutyric acid, ornithine, and citrulline (Cit).
  • alanine 2-amino-2-cyclohexylacetic acid
  • 2-amino-2- phenylacetic acid arginine, asparagine, aspartic acid
  • valine-citrulline (val-cit or vc) dipeptide linker reagent useful for constructing a linker-PBD drug moiety intermediate for conjugation to an antibody, having a para- aminobenzylcarbamoyl (PAB) self-immolative spacer has the structure:
  • Q is Ci Cs alkyl, -0-(Ci Ce alkyl), -halogen, -NO? or -CN; and m is an integer ranging from 0-4.
  • An exemplary phe-lys(Mtr) dipeptide linker reagent having a p-aminobenzyl group can be prepared according to Dubowchik, et al. (1997) Tetrahedron Letters, 38:5257-60, and has the structure:
  • Mtr is mono-4-methoxytrityl
  • Q is Ci-Ce alkyl, -0-(Ci-Ce alkyl), -halogen, -NO2 or -CN
  • m is an integer ranging from 0-4.
  • the "self-immolative linker” PAB para-aminobenzyloxycarbonyl
  • PAB para-aminobenzyloxycarbonyl
  • PAB self-immolative spacers besides PAB include, but are not limited to: (i) aromatic compounds that are electronically similar to the PAB group such as 2-aminoimidazol-5-methanol derivatives (Hay et al. (1999) Bioorg.
  • Spacers can be used that undergo cyclization upon amide bond hydrolysis, such as substituted and unsubstituted 4- aminobutyric acid amides (Rodrigues et al (1995) Chemistry Biology 2:223), appropriately substituted bicyclo[2.2.1] and bicyclo[2.2.2] ring systems (Storm et al (1972) J. Amer. Chem.
  • valine-citrulline dipeptide PAB analog reagent has a 2,6 dimethyl hen l rou and has the structure:
  • Linker reagents useful for the antibody drug conjugates of the disclosure include, but are not limited to: BMPEO, BMPS, EMCS, GMBS, HBVS, LC-SMCC, MBS, MPBH, SBAP, SIA, SIAB, SMCC, SMPB, SMPH, sulfo-EMCS, sulfo-GMBS, sulfo-KMUS, sulfo-MBS, sulfo- SIAB, sulfo-SMCC, and sulfo-SMPB, and SVSB (succinimidyl-(4-vinylsulfone)benzoate), and bis-maleimide reagents: DTME, BMB, BMDB, BMH, BMOE, 1 ,8-bis- maleimidodiethyleneglycol (BM(PEO)2), and 1 ,1 1 -bis-maleimidotriethyleneglycol (BM(PEO)3), which are commercially
  • Bis-maleimide reagents allow the attachment of a free thiol group of a cysteine residue of an antibody to a thiol-containing drug moiety, label, or linker intermediate, in a sequential or concurrent fashion.
  • Other functional groups besides maleimide, which are reactive with a thiol group of an antibody, PBD drug moiety, or linker intermediate include iodoacetamide, bromoacetamide, vinyl pyridine, disulfide, pyridyl disulfide, isocyanate, and isothiocyanate.
  • linker reagents are: N-succinimidyl-4-(2-pyridylthio)pentanoate (SPP), N-succinimidyl-3-(2-pyridyldithio) propionate (SPDP, Carlsson et al (1978) Biochem. J.
  • succinimidyl-4-(N-maleimidomethyl) cyclohexane-1 -carboxylate SMCC
  • iminothiolane IT
  • bifunctional derivatives of imidoesters such as dimethyl adipimidate HCI
  • active esters such as disuccinimidyl suberate
  • aldehydes such as glutaraldehyde
  • bis- azido compounds such as bis (p-azidobenzoyl) hexanediamine
  • bis-diazonium derivatives such as bis-(p-diazoniumbenzoyl)-ethylenediamine
  • diisocyanates such as toluene 2,6- diisocyanate
  • bis-active fluorine compounds such as 1 .5-difluoro-2,4-dinitrobenzene.
  • Useful linker reagents can also be obtained via other commercial sources, such as
  • the Linker may be a dendritic type linker for covalent attachment of more than one drug moiety through a branching, multifunctional linker moiety to an antibody (US 2006/1 16422; US 2005/271615; de Groot et al (2003) Angew. Chem. Int. Ed. 42:4490-4494; Amir et al (2003) Angew. Chem. Int. Ed. 42:4494-4499; Shamis et al (2004) J. Am. Chem. Soc.
  • Dendritic linkers can increase the molar ratio of drug to antibody, i.e. loading, which is related to the potency of the ADC.
  • loading i.e. loading
  • a multitude of drug moieties may be attached through a dendritic or branched linker.
  • the conjugate of the first aspect of the disclosure may have a capping group R c at the N10 position (R 20 ).
  • the group R c is removable from the N10 position of the PBD moiety to leave an N 10-C1 1 imine bond, a carbinolamine, a substituted carbinolamine, where QR 11 is OSO3M, a bisulfite adduct, a thiocarbinolamine, a substituted thiocarbinolamine, or a substituted carbinaiamine.
  • R c may be a protecting group that is removable to leave an N10-C1 1 imine bond, a carbinolamine, a substituted cabinolamine, or, where QR 11 is OSO3M, a bisulfite adduct.
  • R c is a protecting group that is removable to leave an N10-C1 1 imine bond.
  • the group R c is intended to be removable under the same conditions as those required for the removal of the group R 10 , for example to yield an N10-C1 1 imine bond, a carbinolamine and so on.
  • the capping group acts as a protecting group for the intended functionality at the N10 position.
  • the capping group is intended not to be reactive towards an antibody.
  • R c is not the same as R L .
  • the group R c is removable under the conditions that cleave the linker R i r .
  • the capping group is cleavable by the action of an enzyme.
  • R c may be an N10 protecting group, such as those groups described in the inventors ' earlier application, WO 00/12507. In one embodiment, R c is a therapeutically removable nitrogen protecting group, as defined in the inventors' earlier application, WO 00/12507.
  • R c is a carbamate protecting group.
  • the carbamate protecting group is selected from:
  • the carbamate protecting group is further selected from Moc.
  • R c is a linker group R L lacking the functional group for connection to the antibody.
  • L 2 is as defined above in relation to R i r .
  • G 2 is Ac (acetyl) or Moc, or a carbamate protecting group selected from:
  • the carbamate protecting group is further selected from Moc.
  • the acyl group together with an amino group of L 3 or L 2 may form an amide bond.
  • the acyl group together with a hydroxy group of L 3 or L 2 may form an ester bond.
  • G 3 is heteroalkyi.
  • the heteroalkyi group may comprise polyethylene glycol.
  • the heteroalkyi group may have a heteroatom, such as O or N, adjacent to the acyl group, thereby forming a carbamate or carbonate group, where appropriate, with a heteroatom present in the group L 3 or L 2 , where appropriate.
  • G 3 is selected from NH 2 , NHR and NRR ' .
  • G 3 is NRR ' .
  • G 2 is the group:
  • n 0 to 6 and G 4 is selected from OH, OR, SH, SR, COOR, CONH 2 , CONHR, CONRR', NH 2 , NHR, NRR ' , N0 2 , and halo.
  • the groups OH, SH, NH 2 and NHR are protected.
  • n is 1 to 6, and preferably n is 5.
  • G 4 is OR, SR, COOR, CONH 2 , CONHR, CONRR', and NRR'.
  • G 4 is OR, SR, and NRR'.
  • G 4 is selected from OR and NRR', most preferably G 4 is OR. Most preferably G 4 is OMe.
  • the group G 2 is:
  • n and G 4 are as defined above.
  • the group G 2 is:
  • n is 1 and m is 0 to 10. 1 to 2, preferably 4 to 8, and most preferably 4 or 8.
  • n is 1 and m is 10 to 50, preferably 20 to 40.
  • the groups OH, SH, Nh and NHR are protected.
  • G 4 is OR, SR, COOR, CONH 2 , CONHR, CONRR', and NRR ' .
  • G 4 is OR, SR, and NRR ' .
  • G 4 is selected from OR and NRR ' , most preferably G 4 is OR.
  • G 4 is OMe.
  • the group G 2 is:
  • the group G 2 is:
  • n is 1 -20, m is 0-6, and G 4 is selected from OH, OR, SH, SR, COOR, CONH 2 , CONHR, CONRR', NH 2 , NHR, NRR', N0 2 , and halo.
  • n is 1 -10.
  • n is 10 to 50, preferably 20 to 40.
  • n is 1.
  • m is 1.
  • the groups OH, SH, NH 2 and NHR are protected.
  • G 4 is OR, SR, COOR, CONH 2 , CONHR, CONRR ' , and NRR ' .
  • G 4 is OR, SR, and NRR ' .
  • G 4 is selected from OR and NRR', most preferably G 4 is OR.
  • G 4 is OMe.
  • the group G 2 is:
  • G 4 may be OH, SH, NH 2 and NHR. These groups are preferably protected.
  • OH is protected with Bzl, TBDMS, or TBDPS.
  • SH is protected with Acm, Bzl, Bzl-OMe, Bzl-Me, or Trt.
  • NH 2 or NHR are protected with Boc, Moc, Z-CI, Fmoc, Z, or Alloc.
  • the group G 2 is present in combination with a group L 3 , which group is a dipeptide.
  • the capping group is not intended for connection to the antibody.
  • the other monomer present in the dimer serves as the point of connection to the antibody via a linker.
  • the functionality present in the capping group is not available for reaction with an antibody.
  • reactive functional groups such as OH, SH, NH 2 , COOH are preferably avoided.
  • such functionality may be present in the capping group if protected, as described above.
  • D L Is selected from the group comprising: ConjA
  • the drug loading is the average number of PBD drugs per antibody, e.g. antibody.
  • drug loading may range from 1 to 8 drugs (D L ) per antibody, i.e. where 1 , 2, 3, 4, 5, 6, 7, and 8 drug moieties are covalently attached to the antibody.
  • Compositions of conjgates include collections of antibodies, conjugated with a range of drugs, from 1 to 8.
  • drug loading may range from 1 to 20 drugs (D L ) per antibody, although an upper limit of 10 or 8 may be preferred.
  • Compositions of conjgates include collections of antibodies, conjugated with a range of drugs, from 1 to 20, 1 to 10 or 1 to 8.
  • the average number of drugs per antibody in preparations of ADC from conjugation reactions may be characterized by conventional means such as UV, reverse phase HPLC, HIC, mass spectroscopy, ELISA assay, and electrophoresis.
  • the quantitative distribution of ADC in terms of p may also be determined.
  • ELISA the averaged value of p in a particular preparation of ADC may be determined (Hamblett et al (2004) Clin. Cancer Res. 10:7063-7070; Sanderson et al (2005) Clin. Cancer Res. 1 1 :843-852).
  • the distribution of p (drug) values is not discernible by the antibody-antigen binding and detection limitation of ELISA.
  • ELISA assay for detection of antibody-drug conjugates does not determine where the drug moieties are attached to the antibody, such as the heavy chain or light chain fragments, or the particular amino acid residues.
  • separation, purification, and characterization of homogeneous ADC where p is a certain value from ADC with other drug loadings may be achieved by means such as reverse phase HPLC or electrophoresis.
  • Such techniques are also applicable to other types of conjugates.
  • p may be limited by the number of attachment sites on the antibody.
  • an antibody may have only one or several cysteine thiol groups, or may have only one or several sufficiently reactive thiol groups through which a linker may be attached.
  • Higher drug loading, e.g. p >5 may cause aggregation, insolubility, toxicity, or loss of cellular permeability of certain antibody-drug conjugates.
  • an antibody may contain, for example, many lysine residues that do not react with the drug-linker intermediate (D-L) or linker reagent. Only the most reactive lysine groups may react with an amine-reactive linker reagent. Also, only the most reactive cysteine thiol groups may react with a thiol-reactive linker reagent. Generally, antibodies do not contain many, if any, free and reactive cysteine thiol groups which may be linked to a drug moiety.
  • cysteine thiol residues in the antibodies of the compounds exist as disulfide bridges and must be reduced with a reducing agent such as dithiothreitol (DTT) or TCEP, under partial or total reducing conditions.
  • DTT dithiothreitol
  • the loading (drug/antibody ratio) of an ADC may be controlled in several different manners, including: (i) limiting the molar excess of drug-linker intermediate (D-L) or linker reagent relative to antibody, (ii) limiting the conjugation reaction time or temperature, and (iii) partial or limiting reductive conditions for cysteine thiol modification.
  • Certain antibodies have reducible interchain disulfides, i.e. cysteine bridges.
  • Antibodies may be made reactive for conjugation with linker reagents by treatment with a reducing agent such as DTT (dithiothreitol). Each cysteine bridge will thus form, theoretically, two reactive thiol nucleophiles. Additional nucleophilic groups can be introduced into antibodies through the reaction of lysines with 2-iminothiolane (Traut ' s reagent) resulting in conversion of an amine into a thiol. Reactive thiol groups may be introduced into the antibody (or fragment thereof) by engineering one, two, three, four, or more cysteine residues (e.g., preparing mutant antibodies comprising one or more non-native cysteine amino acid residues). US 7521541 teaches engineering antibodies by introduction of reactive cysteine amino acids.
  • Cysteine amino acids may be engineered at reactive sites in an antibody and which do not form intrachain or intermolecular disulfide linkages (Junutula, et al., 2008b Nature Biotech., 26(8):925-932; Dornan et al (2009) Blood 1 14(13):2721 -2729; US 7521541 ; US 7723485; WO2009/052249).
  • the engineered cysteine thiols may react with linker reagents or the drug-linker reagents of the present disclosure which have thiol-reactive, electrophilic groups such as maleimide or alpha-halo amides to form ADC with cysteine engineered antibodies and the PBD drug moieties.
  • the location of the drug moiety can thus be designed, controlled, and known.
  • the drug loading can be controlled since the engineered cysteine thiol groups typically react with thiol-reactive linker reagents or drug-linker reagents in high yield.
  • Engineering an IgG antibody to introduce a cysteine amino acid by substitution at a single site on the heavy or light chain gives two new cysteines on the symmetrical antibody.
  • a drug loading near 2 can be achieved with near homogeneity of the conjugation product ADC.
  • site-specific conjugation can be achieved by engineering antibodies to contain unnatural amino acids in their heavy and/or light chains as described by Axup et al. ((2012), Proc Natl Acad Sci U S A. 109(40):16101-161 16).
  • the unnatural amino acids provide the additional advantage that orthogonal chemistry can be designed to attach the linker reagent and drug.
  • the resulting product is a mixture of ADC compounds with a distribution of drug moieties attached to an antibody, e.g. 1 , 2, 3, etc.
  • Liquid chromatography methods such as polymeric reverse phase (PLRP) and hydrophobic interaction (HIC) may separate compounds in the mixture by drug loading value.
  • Preparations of ADC with a single drug loading value (p) may be isolated, however, these single loading value ADCs may still be heterogeneous mixtures because the drug moieties may be attached, via the linker, at different sites on the antibody.
  • the antibody-drug conjugate compositions of the disclosure include mixtures of antibody-drug conjugate compounds where the antibody has one or more PBD drug moieties and where the drug moieties may be attached to the antibody at various amino acid residues.
  • the average number of dimer pyrrolobenzodiazepine groups per antibody is in the range 1 to 20. In some embodiments the range is selected from 1 to 8, 2 to 8, 2 to 6. 2 to 4, and 4 to 8.
  • dimer pyrrolobenzodiazepine group per antibody.
  • a reference to carboxylic acid (-COOH) also includes the anionic (carboxylate) form (-COO ), a salt or solvate thereof, as well as conventional protected forms.
  • a reference to an amino group includes the protonated form (-N + H 1 R 2 ), a salt or solvate of the amino group, for example, a
  • hydrochloride salt as well as conventional protected forms of an amino group.
  • a reference to a hydroxyl group also includes the anionic form (-0 " ), a salt or solvate thereof, as well as conventional protected forms.
  • a corresponding salt of the active compound for example, a pharmaceutically-acceptable salt.
  • a pharmaceutically-acceptable salt examples are discussed in Berge, et al., J. Pharm. Sci.. 66, 1 -19 (1977).
  • a salt may be formed with a suitable cation.
  • suitable inorganic cations include, but are not limited to, alkali metal ions such as Na' and K ⁇ alkaline earth cations such as Ca 2+ and Mg 2 ' , and other cations such as ⁇ 3 .
  • suitable organic cations include, but are not limited to, ammonium ion (i.e. NH 4 ') and substituted ammonium ions (e.g. NH3R' , NH2R2' , NHR3' , NR 4 + ).
  • suitable substituted ammonium ions are those derived from: ethylamine, diethylamine,
  • dicyclohexylamine triethylamine, butylamine, ethylenediamine, ethanolamine, diethanolamine, piperazine, benzylamine, phenylbenzylamine, choline, meglumine, and tromethamine, as well as amino acids, such as lysine and arginine.
  • An example of a common quaternary ammonium ion is N CH3) 4 + .
  • a salt may be formed with a suitable anion.
  • suitable inorganic anions include, but are not limited to, those derived from the following inorganic acids:
  • hydrochloric hydrobromic, hydroiodic, sulfuric, sulfurous, nitric, nitrous, phosphoric, and phosphorous.
  • Suitable organic anions include, but are not limited to, those derived from the following organic acids: 2-acetyoxybenzoic, acetic, ascorbic, aspartic, benzoic,
  • Suitable polymeric organic anions include, but are not limited to, those derived from the following polymeric acids: tannic acid, carboxymethyl cellulose.
  • solvate is used herein in the conventional sense to refer to a complex of solute (e.g. active compound, salt of active compound) and solvent. If the solvent is water, the solvate may be conveniently referred to as a hydrate, for example, a mono-hydrate, a di-hydrate, a tri-hydrate, etc.
  • the disclosure includes compounds where a solvent adds across the imine bond of the PBD moiety, which is illustrated below where the solvent is water or an alcohol (R A OH, where R A is C1-4 alkyl):
  • carbinolamine and carbinolamine ether forms of the PBD can be called the carbinolamine and carbinolamine ether forms of the PBD (as described in the section relating to R 10 above).
  • the balance of these equilibria depend on the conditions in which the compounds are found, as well as the nature of the moiety itself. These particular compounds may be isolated in solid form, for example, by lyophilisation.
  • Certain compounds of the disclosure may exist in one or more particular geometric, optical, enantiomeric, diasteriomeric, epimeric, atropic, stereoisomeric, tautomeric, conformational, or anomeric forms, including but not limited to, cis- and trans-forms; E- and Z-forms; c-, t-, and r- forms; endo- and exo-forms; R-, S-, and meso-forms; D- and L-forms; d- and l-forms; (+) and (-) forms; keto-, enol-, and enolate-forms; syn- and anti-forms; synclinal- and anticlinal-forms; a- and ⁇ -forms; axial and equatorial forms; boat-, chair-, twist-, envelope-, and halfchair-forms; and combinations thereof, hereinafter collectively referred to as "isomers” (or "isomeric forms").
  • chirai refers to molecules which have the property of non-superimposability of the mirror image partner, while the term “achiral” refers to molecules which are superimposable on their mirror image partner.
  • stereoisomers refers to compounds which have identical chemical constitution, but differ with regard to the arrangement of the atoms or groups in space.
  • Diastereomer refers to a stereoisomer with two or more centers of chirality and whose molecules are not mirror images of one another. Diastereomers have different physical properties, e.g. melting points, boiling points, spectral properties, and reactivities. Mixtures of diastereomers may separate under high resolution analytical procedures such as electrophoresis and chromatography. “Enantiomers” refer to two stereoisomers of a compound which are non-superimposable mirror images of one another.
  • the compounds of the disclosure may contain asymmetric or chirai centers, and therefore exist in different stereoisomeric forms. It is intended that all stereoisomeric forms of the compounds of the disclosure, including but not limited to, diastereomers, enantiomers and atropisomers, as well as mixtures thereof such as racemic mixtures, form part of the present disclosure.
  • a specific stereoisomer may also be referred to as an enantiomer, and a mixture of such isomers is often called an enantiomeric mixture.
  • a 50:50 mixture of enantiomers is referred to as a racemic mixture or a racemate, which may occur where there has been no stereoselection or stereospecificity in a chemical reaction or process.
  • the terms “racemic mixture” and “racemate” refer to an equimolar mixture of two enantiomeric species, devoid of optical activity.
  • isomers are structural (or constitutional) isomers (i.e. isomers which differ in the connections between atoms rather than merely by the position of atoms in space).
  • a reference to a methoxy group, -OCH 3 is not to be construed as a reference to its structural isomer, a hydroxymethyl group, -CH 2 OH.
  • a reference to ortho-chlorophenyl is not to be construed as a reference to its structural isomer, meta- chlorophenyl.
  • a reference to a class of structures may well include structurally isomeric forms falling within that class (e.g. C1-7 alkyl includes n-propyl and iso-propyl; butyl includes n-, iso-, sec-, and tert-butyl; methoxyphenyl includes ortho-, meta-, and para- methoxyphenyl).
  • C1-7 alkyl includes n-propyl and iso-propyl; butyl includes n-, iso-, sec-, and tert-butyl; methoxyphenyl includes ortho-, meta-, and para- methoxyphenyl).
  • the above exclusion does not pertain to tautomeric forms, for example, keto-, enol-, and enolate-forms, as in, for example, the following tautomeric pairs: keto/enol (illustrated below), imine/enamine, amide/imino alcohol, amidine/amidine, nitroso/oxime
  • tautomer or “tautomeric form” refers to structural isomers of different energies which are interconvertible via a low energy barrier.
  • proton tautomers also known as prototropic tautomers
  • Valence tautomers include interconversions by reorganization of some of the bonding electrons.
  • H may be in any isotopic form, including 1 H, 2 H (D), and 3 H (T); C may be in any isotopic form, including 2 C, 13 C, and 14 C; O may be in any isotopic form, including 16 0 and 18 0; and the like.
  • isotopes examples include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorous, fluorine, and chlorine, such as, but not limited to 2 H (deuterium, D), 3 H (tritium), 11 C, 13 C, 14 C, 15 N, 18 F, 31 P, 32 P, 35 S, 36 CI, and 125 l.
  • isotopically labeled compounds of the present disclosure for example those into which radioactive isotopes such as 3H, 13C, and 14C are incorporated.
  • Such isotopically labelled compounds may be useful in metabolic studies, reaction kinetic studies, detection or imaging techniques, such as positron emission tomography (PET) or single- photon emission computed tomography (SPECT) including drug or substrate tissue distribution assays, or in radioactive treatment of patients.
  • Deuterium labelled or substituted therapeutic compounds of the disclosure may have improved DMPK (drug metabolism and pharmacokinetics) properties, relating to distribution, metabolism, and excretion (ADME). Substitution with heavier isotopes such as deuterium may afford certain therapeutic advantages resulting from greater metabolic stability, for example increased in vivo half-life or reduced dosage requirements.
  • An 18F labeled compound may be useful for PET or SPECT studies.
  • Isotopically labeled compounds of this disclosure and prodrugs thereof can generally be prepared by carrying out the procedures disclosed in the schemes or in the examples and preparations described below by substituting a readily available isotopically labeled reagent for a non-isotopically labeled reagent.
  • substitution with heavier isotopes, particularly deuterium may afford certain therapeutic advantages resulting from greater metabolic stability, for example increased in vivo half-life or reduced dosage requirements or an improvement in therapeutic index.
  • deuterium in this context is regarded as a substituent.
  • the concentration of such a heavier isotope, specifically deuterium may be defined by an isotopic enrichment factor.
  • any atom not specifically designated as a particular isotope is meant to represent any stable isotope of that atom.
  • a reference to a particular compound includes all such isomeric forms, including (wholly or partially) racemic and other mixtures thereof.
  • Methods for the preparation (e.g. asymmetric synthesis) and separation (e.g. fractional crystallisation and chromatographic means) of such isomeric forms are either known in the art or are readily obtained by adapting the methods taught herein, or known methods, in a known manner.
  • the cytotoxic or cytostatic activity of an antibody-drug conjugate may bemeasured or confirmed by: exposing mammalian cells (including both those having and lacking receptor proteins) to the antibody of the ADC in a cell culture medium; culturing the cells for a period from about 6 hours to about 5 days; and measuring cell viability.
  • Cell- based in vitro assays are used to measure viability (proliferation), cytotoxicity, and induction of apoptosis (caspase activation) of an ADC of the disclosure.
  • the in vitro potency of antibody-drug conjugates can be measured by a cell proliferation assay.
  • the CellTiter-Glo ® Luminescent Cell Viability Assay is a commercially available (Promega Corp., Madison, Wl), homogeneous assay method based on the recombinant expression of Coleoptera luciferase (US Patent Nos. 5583024; 5674713 and 5700670).
  • This cell proliferation assay determines the number of viable cells in culture based on quantitation of the ATP present, an indicator of metabolically active cells (Crouch et a/ (1993) J. Immunol. Meth. 160:81-88; US 6602677).
  • the CellTiter-Glo ® Assay is conducted in 96 well format, making it amenable to automated high-throughput screening (HTS) (Cree et a/ (1995) Anticancer Drugs 6:398-404).
  • the homogeneous assay procedure involves adding the single reagent (CellTiter-Glo ® Reagent) directly to cells cultured in serum-supplemented medium. Cell washing, removal of medium and multiple pipetting steps are not required.
  • the system detects as few as 15 cells/well in a 384-well format in 10 minutes after adding reagent and mixing.
  • the cells may be treated continuously with ADC, or they may be treated and separated from ADC. Generally, cells treated briefly, i.e. 3 hours, showed the same potency effects as continuously treated cells.
  • the homogeneous "add-mix-measure” format results in cell lysis and generation of a luminescent signal proportional to the amount of ATP present.
  • the amount of ATP is directly proportional to the number of cells present in culture.
  • the CellTiter-Glo ® Assay generates a "glow-type" luminescent signal, produced by the luciferase reaction, which has a half-life generally greater than five hours, depending on cell type and medium used. Viable cells are reflected in relative luminescence units (RLU).
  • the substrate, Beetle Luciferin is oxidatively decarboxylated by recombinant firefly luciferase with concomitant conversion of ATP to AMP and generation of photons.
  • the in vitro potency of antibody-drug conjugates can also be measured by a cytotoxicity assay.
  • Cultured adherent cells are washed with PBS, detached with trypsin, diluted in complete medium, containing 10% FCS, centrifuged, re-suspended in fresh medium and counted with a haemocytometer. Suspension cultures are counted directly. Monodisperse cell suspensions suitable for counting may require agitation of the suspension by repeated aspiration to break up cell clumps. The cell suspension is diluted to the desired seeding density and dispensed (100 ⁇ per well) into black 96 well plates. Plates of adherent cell lines are incubated overnight to allow adherence. Suspension cell cultures can be used on the day of seeding.
  • a stock solution (1 ml) of ADC (20pg/ml) is made in the appropriate cell culture medium.
  • Serial 10-fold dilutions of stock ADC are made in 15ml centrifuge tubes by serially transferring 100 ⁇ to 900 ⁇ of cell culture medium.
  • ADC incubation is for 5 days, otherwise a four day incubation is done.
  • Alamar blue assay is assessed with the Alamar blue assay.
  • AlamarBlue Invitrogen
  • Alamar blue fluorescence is measured at excitation 570nm, emission 585nm on the Varioskan flash plate reader. Percentage cell survival is calculated from the mean fluorescence in the ADC treated wells compared to the mean fluorescence in the control wells.
  • the conjugates of the disclosure may be used to provide a PBD compound at a target location.
  • the target location is preferably a proliferative cell population.
  • the antibody is an antibody for an antigen (here, CD25) present on a proliferative cell population.
  • an antigen here, CD25
  • the antigen is absent, or present on the cell surface at an insignificant level.
  • the target neoplasm only e.g. less than 80, 70, 60, 50, 30, 20%, 10% or 5%of the cells may be positive.
  • the target neoplasm or neoplastic cells may be all or part of a solid tumor.
  • Solid tumor herein will be understood to include solid hematological cancers such as lymphomas (Hodgkin ' s lymphoma or non-Hodgkin ' s lymphoma) which are discussed in more detail below.
  • lymphomas Hodgkin ' s lymphoma or non-Hodgkin ' s lymphoma
  • Other solid tumors may be neoplasms, including non-hematological cancers, infiltrated with CD-25 positive T-cells.
  • the target neoplasm or neoplastic cells may be malignant.
  • the target neoplasm or neoplastic cells may be metastatic.
  • the linker may be cleaved so as to release a compound elA, RelB, ReIC, RelD or RelE.
  • the conjugate may be used to selectively provide a compound RelA, RelB, Rel C, RelD or RelE to the target location.
  • the linker may be cleaved by an enzyme present at the target location.
  • the target location may be in vitro, in vivo or ex vivo.
  • the antibody-drug conjugate (ADC) compounds of the disclosure include those with utility for anticancer activity.
  • the compounds include an antibody conjugated, i.e.
  • ADC antibody-drug conjugates
  • proliferative disease pertains to an unwanted or uncontrolled cellular proliferation of excessive or abnormal cells which is undesired, such as, neoplastic or hyperplastic growth, whether in vitro or in vivo.
  • proliferative conditions include, but are not limited to, benign, pre-malignant, and malignant cellular proliferation, including but not limited to, neoplasms and tumours (e.g. histocytoma, glioma, astrocyoma, osteoma), cancers (e.g.
  • lung cancer small cell lung cancer, gastrointestinal cancer, bowel cancer, colon cancer, breast carinoma, ovarian carcinoma, prostate cancer, testicular cancer, liver cancer, kidney cancer, bladder cancer, pancreas cancer, brain cancer, sarcoma, osteosarcoma, Kaposi's sarcoma, melanoma), lymphomas, leukemias, psoriasis, bone diseases, fibroproliferative disorders (e.g. of connective tissues), and atherosclerosis.
  • Cancers of particular interest include, but are not limited to, leukemias and ovarian cancers.
  • Any type of cell may be treated, including but not limited to, lung, gastrointestinal (including, e.g. bowel, colon), breast (mammary), ovarian, prostate, liver (hepatic), kidney (renal), bladder, pancreas, brain, and skin.
  • gastrointestinal including, e.g. bowel, colon
  • breast mammary
  • ovarian prostate
  • liver hepatic
  • kidney renal
  • bladder pancreas
  • brain and skin.
  • disorders of particular interest include, but are not limited to, Hodgkin ' s and non-Hodgkin's Lymphoma, including diffuse large B-cell lymphoma (DLBCL), follicular lymphoma, (FL), Mantle Cell lymphoma (MCL), chronic lymphatic lymphoma (CLL) and leukemias such as Hairy cell leukemia (HCL), Hairy cell leukemia variant (HCL-v), Acute Myeloid Leukaemia (AML), and Acute Lymphoblastic Leukaemia (ALL) such as Philadelphia chromosome- positive ALL (Ph+ALL) or Philadelphia chromosome-negative ALL (Ph-ALL) [Fielding A., Haematologica. 2010 Jan; 95(1 ): 8-12].
  • DLBCL diffuse large B-cell lymphoma
  • FL follicular lymphoma
  • MCL Mantle Cell lymphoma
  • CLL chronic lymphatic lymphoma
  • leukemias such as
  • Preferred hematological targets include Hodgkin's and non-Hodgkin ' s Lymphomas, the latter being selected from Peripheral T cell lymphoma; Cutaneous T cell lymphoma; Follicular lymphoma (FL), DLBLC, Mantle cell lymphoma (MCL) and CLL,
  • solid tumors may be neoplasms, including non-hematological cancers, infiltrated with CD-25 positive T-cells.
  • the antibody-drug conjugates (ADC) of the present disclosure may be used to treat various diseases or disorders, e.g. characterized by the overexpression of a tumor antigen.
  • exemplary conditions or hyperprol iterative disorders include benign or malignant tumors; leukemia, hematological, and lymphoid malignancies.
  • Others include neuronal, glial, astrocytal, hypothalamic, glandular, macrophagal, epithelial, stromal, blastocoelic, inflammatory, angiogenic and immunologic, including autoimmune disorders and graft-versus-host disease (GVHD).
  • GVHD graft-versus-host disease
  • the disease or disorder to be treated is a hyperproliferative disease such as cancer.
  • cancer to be treated herein include, but are not limited to, carcinoma, lymphoma, blastoma, sarcoma, and leukemia or lymphoid malignancies. More particular examples of such cancers include squamous cell cancer (e.g. epithelial squamous cell cancer), lung cancer including small-cell lung cancer, non-small cell lung cancer,
  • adenocarcinoma of the lung and squamous carcinoma of the lung cancer of the peritoneum, hepatocellular cancer, gastric or stomach cancer including gastrointestinal cancer, pancreatic cancer, glioblastoma, cervical cancer, ovarian cancer, liver cancer, bladder cancer, hepatoma, breast cancer, colon cancer, rectal cancer, colorectal cancer, endometrial or uterine carcinoma, salivary gland carcinoma, kidney or renal cancer, prostate cancer, vulval cancer, thyroid cancer, hepatic carcinoma, anal carcinoma, penile carcinoma, as well as head and neck cancer.
  • Autoimmune diseases for which the ADC compounds may be used in treatment include rheumatologic disorders (such as, for example, rheumatoid arthritis, Sjogren's syndrome, scleroderma, lupus such as SLE and lupus nephritis, polymyositis/dermatomyositis, cryoglobulinemia, anti-phospholipid antibody syndrome, and psoriatic arthritis), osteoarthritis, autoimmune gastrointestinal and liver disorders (such as, for example, inflammatory bowel diseases (e.g.
  • autoimmune gastritis and pernicious anemia autoimmune hepatitis, primary biliary cirrhosis, primary sclerosing cholangitis, and celiac disease
  • vasculitis such as, for example, ANCA-associated vasculitis, including Churg-Strauss vasculitis, Wegener's granulomatosis, and polyarteriitis
  • autoimmune neurological disorders such as, for example, multiple sclerosis, opsoclonus myoclonus syndrome, myasthenia gravis, neuromyelitis optica, Parkinson ' s disease, Alzheimer's disease, and autoimmune polyneuropathies
  • renal disorders such as, for example, glomerulonephritis, Goodpasture's syndrome, and Berger's disease
  • autoimmune dermatologic disorders such as, for example, psoriasis, urticaria, hives, pemphigus vulgaris, bullous pemphigoi
  • GVHD autoimmune endocrine disorders
  • diabetes mellitus IDL
  • Addison's disease autoimmune thyroid disease
  • autoimmune thyroid disease e.g. Graves' disease and thyroiditis
  • More preferred such diseases include, for example, rheumatoid arthritis, ulcerative colitis, ANCA- associated vasculitis, lupus, multiple sclerosis, Sjogren's syndrome, Graves' disease, IDDM, pernicious anemia, thyroiditis, and glomerulonephritis.
  • the conjugates of the present disclosure may be used in a method of therapy. Also provided is a method of treatment, comprising administering to a subject in need of treatment a therapeutically-effective amount of a conjugate compound of the disclosure.
  • a therapeutically-effective amount is an amount sufficient to show benefit to a patient. Such benefit may be at least amelioration of at least one symptom.
  • the actual amount administered, and rate and time-course of administration, will depend on the nature and severity of what is being treated. Prescription of treatment, e.g. decisions on dosage, is within the responsibility of general practitioners and other medical doctors.
  • a compound of the disclosure may be administered alone or in combination with other treatments, either simultaneously or sequentially dependent upon the condition to be treated.
  • treatments and therapies include, but are not limited to, chemotherapy (the administration of active agents, including, e.g. drugs, such as chemotherapeutics); surgery; and radiation therapy.
  • chemotherapeutic agent is a chemical compound useful in the treatment of cancer, regardless of mechanism of action.
  • Classes of chemotherapeutic agents include, but are not limited to: alkylating agents, antimetabolites, spindle poison plant alkaloids,
  • Chemotherapeutic agents include compounds used in "targeted therapy” and conventional chemotherapy.
  • chemotherapeutic agents include: erlotinib (TARCEVA®, Genentech/OSI Pharm.), docetaxel (TAXOTERE®, Sanofi-Aventis), 5-FU (fluorouracil, 5-fiuorouracil, CAS No. 51 -21-8), gemcitabine (GE ZAR®, Lilly), PD-0325901 (CAS No. 391210-10-9, Pfizer), cisplatin (cis-diamine, dichloroplatinum(ll), CAS No. 15663-27-1 ), carboplatin (CAS No.
  • paclitaxel TAXOL®, Bristol-Myers Squibb Oncology, Princeton, N.J.
  • trastuzumab HERCEPTIN®, Genentech
  • temozolomide 4-methyl-5-oxo- 2,3,4.6,8- pentazabicyclo [4.3.0] nona-2,7,9-triene- 9-carboxamide, CAS No. 85622-93-1 ,
  • TEMODAR® TEMODAL®, Schering Plough
  • tamoxifen ((2 2-[4-(1 ,2-diphenylbut-1 - enyl)phenoxy]-A/,A/-dimethylethanamine
  • NOLVADEX® NOLVADEX®
  • ISTUBAL® ISTUBAL®
  • VALODEX® doxorubicin
  • ADRIAMYCIN® doxorubicin
  • chemotherapeutic agents include: oxaliplatin (ELOXATIN®, Sanofi), bortezomib (VELCADE®, Millennium Pharm.), sutent (SUNITINIB®, SU1 1248, Pfizer), letrozole (FEMARA®, Novartis), imatinib mesylate (GLEEVEC®, Novartis), XL-518 (Mek inhibitor, Exelixis, WO 2007/044515), ARRY-886 (Mek inhibitor, AZD6244, Array BioPharma, Astra Zeneca), SF-1 126 (PI3K inhibitor, Semafore Pharmaceuticals), BEZ-235 (PI3K inhibitor, Novartis), XL-147 (PI3K inhibitor, Exelixis), PTK787/ZK 222584 (Novartis), fulvestrant (FASLODEX®, AstraZeneca), leucovorin (folinic acid), rapamycin (si
  • calicheamicin calicheamicin gammal I, calicheamicin omegaH (Angew Chem. Intl. Ed. Engl. (1994) 33:183-186); dynemicin, dynemicin A; bisphosphonates, such as clodronate; an
  • esperamicin as well as neocarzinostatin chromophore and related chromoprotein enediyne antibiotic chromophores), aclacinomysins, actinomycin, authramycin, azaserine, bleomycins, cactinomycin, carabicin, carminomycin, carzinophilin, chromomycinis, dactinomycin, daunorubicin, detorubicin, 6-diazo-5-oxo-L-norleucine, morpholino-doxorubicin,
  • cyanomorpholino-doxorubicin 2-pyrrolino-doxorubicin and deoxydoxorubicin
  • epirubicin esorubicin, idarubicin, nemorubicin, marcellomycin
  • mitomycins such as mitomycin C, mycophenolic acid, nogalamycin, olivomycins, peplomycin, porfiromycin, puromycin, quelamycin, rodorubicin, streptonigrin, streptozocin, tubercidin, ubenimex, zinostatin, zorubicin
  • anti-metabolites such as methotrexate and 5-fluorouracil (5-FU); folic acid analogs such as denopterin, methotrexate, pteropterin, trimetrexate; purine analogs such as fludarabine, 6-mercaptopurine, thiamiprine, thioguanine; pyrimidine analogs such as ancitabine, azacitidine, 6-aza
  • etoglucid gallium nitrate; hydroxyurea; lentinan; lonidainine; maytansinoids such as maytansine and ansamitocins; mitoguazone; mitoxantrone; mopidanmol; nitraerine;
  • pentostatin phenamet
  • pirarubicin losoxantrone
  • podophyllinic acid 2-ethylhydrazide
  • PSK® polysaccharide complex JHS Natural Products, Eugene, OR
  • razoxane rhizoxin; sizofiran; spirogermanium; tenuazonic acid; triaziquone; 2,2 ,2' - trichlorotriethylamine; trichothecenes (especially T-2 toxin, verracurin A, roridin A and anguidine); urethan; vindesine; dacarbazine; mannomustine; mitobronitol; mitolactol;
  • pipobroman gacytosine; arabinoside ("Ara-C”); cyclophosphamide; thiotepa; 6-thioguanine; mercaptopurine; methotrexate; platinum analogs such as cisplatin and carboplatin;
  • vinblastine etoposide (VP-16); ifosfamide; mitoxantrone; vincristine; vinorelbine
  • NAVELBINE® novantrone
  • teniposide edatrexate
  • daunomycin aminopterin
  • capecitabine XELODA®, Roche
  • ibandronate CPT-1 1 ; topoisomerase inhibitor RFS 2000;
  • DMFO difluoromethylornithine
  • retinoids such as retinoic acid
  • pharmaceutically acceptable salts, acids and derivatives of any of the above DMFO
  • DMFO difluoromethylornithine
  • chemotherapeutic agent include: (i) anti-hormonal agents that act to regulate or inhibit hormone action on tumors such as anti-estrogens and selective estrogen receptor modulators (SERMs), including, for example, tamoxifen (including NOLVADEX®; tamoxifen citrate), raloxifene, droloxifene, 4-hydroxytamoxifen, trioxifene, keoxifene, LY1 17018, onapristone, and FARESTON® (toremifine citrate); (ii) aromatase inhibitors that inhibit the enzyme aromatase, which regulates estrogen production in the adrenal glands, such as, for example, 4(5)-imidazoles, aminoglutethimide, MEGASE® (megestrol acetate), AROMASIN® (exemestane; Pfizer), formestanie, fadrozole, RIVISOR® (vorozole), FEMARA® (letrozole
  • chemotherapeutic agent are therapeutic antibodies such as alemtuzumab (Campath), bevacizumab (AVASTIN®, Genentech); cetuximab
  • panitumumab VECTIBIX®, Amgen
  • rituximab RVUXAN®, Genentech/Biogen personalize
  • ARZERRA® GSK
  • pertuzumab PERJETATM, OMNITARGTM, 2C4, Genentech
  • trastuzumab HERCEPTIN®, Genentech
  • tositumomab Bexxar, Corixia
  • antibody drug conjugate gemtuzumab ozogamicin
  • Humanized monoclonal antibodies with therapeutic potential as chemotherapeutic agents in combination with the conjugates of the disclosure include: alemtuzumab, apolizumab, aseiizumab, atiizumab, bapineuzumab, bevacizumab, bivatuzumab mertansine, cantuzumab mertansine, cedelizumab, certolizumab pegol, cidfusituzumab, cidtuzumab, daclizumab, eculizumab, efalizumab, epratuzumab, erlizumab, felvizumab, fontolizumab, gemtuzumab ozogamicin, inotuzumab ozogamicin, ipilimumab, labetuzumab, lintuzumab, matuzumab, mepolizumab, motavizumab, motovizumab
  • tacatuzumab tetraxetan tadocizumab, talizumab, tefibazumab, tocilizumab, toralizumab, trastuzumab, tucotuzumab celmoleukin, tucusituzumab, umavizumab, urtoxazumab, and visilizumab.
  • compositions according to the present disclosure may comprise, in addition to the active ingredient, i.e. a conjugate compound, a pharmaceutically acceptable excipient, carrier, buffer, stabiliser or other materials well known to those skilled in the art. Such materials should be non-toxic and should not interfere with the efficacy of the active ingredient.
  • a pharmaceutically acceptable excipient e.g. a conjugate compound
  • carrier e.g. a pharmaceutically acceptable excipient
  • buffer e.g. cutaneous, subcutaneous, or intravenous.
  • compositions for oral administration may be in tablet, capsule, powder or liquid form.
  • a tablet may comprise a solid carrier or an adjuvant.
  • Liquid pharmaceutical compositions generally comprise a liquid carrier such as water, petroleum, animal or vegetable oils, mineral oil or synthetic oil. Physiological saline solution, dextrose or other saccharide solution or glycols such as ethylene glycol, propylene glycol or polyethylene glycol may be included.
  • a capsule may comprise a solid carrier such a gelatin.
  • the active ingredient will be in the form of a parenterally acceptable aqueous solution which is pyrogen-free and has suitable pH, isotonicity and stability.
  • a parenterally acceptable aqueous solution which is pyrogen-free and has suitable pH, isotonicity and stability.
  • isotonic vehicles such as Sodium Chloride Injection, Ringer's Injection, Lactated Ringer's Injection.
  • Preservatives, stabilisers, buffers, antioxidants and/or other additives may be included, as required.
  • conjugate compound While it is possible for the conjugate compound to be used (e.g., administered) alone, it is often preferable to present it as a composition or formulation.
  • the composition is a pharmaceutical composition (e.g., formulation, preparation, medicament) comprising a conjugate compound, as described herein, and a pharmaceutically acceptable carrier, diluent, or excipient.
  • a pharmaceutical composition e.g., formulation, preparation, medicament
  • a pharmaceutically acceptable carrier e.g., diluent, or excipient.
  • the composition is a pharmaceutical composition comprising at least one conjugate compound, as described herein, together with one or more other
  • compositions further comprises other active agents, for example, other therapeutic or prophylactic agents.
  • Suitable carriers, diluents, excipients, etc. can be found in standard pharmaceutical texts. See, for example, Handbook of Pharmaceutical Additives, 2nd Edition (eds. M. Ash and I. Ash), 2001 (Synapse Information Resources, Inc., Endicott, New York, USA), Remington's Pharmaceutical Sciences, 20th edition, pub. Lippincott, Williams & Wilkins, 2000; and Handbook of Pharmaceutical Excipients, 2nd edition, 1994.
  • compositions as used herein, pertains to compounds, ingredients, materials, compositions, dosage forms, etc., which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of the subject in question (e.g., human) without excessive toxicity, irritation, allergic response, or other problem or complication, commensurate with a reasonable benefit/risk ratio.
  • Each carrier, diluent, excipient, etc. must also be “acceptable” in the sense of being compatible with the other ingredients of the formulation.
  • the formulations may be prepared by any methods well known in the art of pharmacy. Such methods include the step of bringing into association the active compound with a carrier which constitutes one or more accessory ingredients. In general, the formulations are prepared by uniformly and intimately bringing into association the active compound with carriers (e.g., liquid carriers, finely divided solid carrier, etc.), and then shaping the product, if necessary.
  • carriers e.g., liquid carriers, finely divided solid carrier, etc.
  • the formulation may be prepared to provide for rapid or slow release; immediate, delayed, timed, or sustained release; or a combination thereof.
  • Formulations suitable for parenteral administration include aqueous or non-aqueous, isotonic, pyrogen-free, sterile liquids (e.g., solutions, suspensions), in which the active ingredient is dissolved, suspended, or otherwise provided (e.g., in a liposome or other microparticulate).
  • sterile liquids e.g., solutions, suspensions
  • Such liquids may additional contain other pharmaceutically acceptable ingredients, such as anti-oxidants, buffers, preservatives, stabilisers,
  • bacteriostats suspending agents, thickening agents, and solutes which render the formulation isotonic with the blood (or other relevant bodily fluid) of the intended recipient.
  • excipients include, for example, water, alcohols, polyols, glycerol, vegetable oils, and the like.
  • suitable isotonic carriers for use in such formulations include Sodium Chloride Injection, Ringer's Solution, or Lactated Ringer's Injection.
  • concentration of the active ingredient in the liquid is from about 1 ng/ml to about 10 pg/ml, for example from about 10 ng/ml to about 1 pg/ml.
  • the formulations may be presented in unit-dose or multi-dose sealed containers, for example, ampoules and vials, and may be stored in a freeze-dried (lyophilised) condition requiring only the addition of the sterile liquid carrier, for example water for injections, immediately prior to use.
  • sterile liquid carrier for example water for injections, immediately prior to use.
  • Extemporaneous injection solutions and suspensions may be prepared from sterile powders, granules, and tablets.
  • appropriate dosages of the conjugate compound, and compositions comprising the conjugate compound can vary from patient to patient. Determining the optimal dosage will generally involve the balancing of the level of therapeutic benefit against any risk or deleterious side effects.
  • the selected dosage level will depend on a variety of factors including, but not limited to, the activity of the particular compound, the route of administration, the time of administration, the rate of excretion of the compound, the duration of the treatment, other drugs, compounds, and/or materials used in combination, the severity of the condition, and the species, sex, age, weight, condition, general health, and prior medical history of the patient.
  • the amount of compound and route of administration will ultimately be at the discretion of the physician, veterinarian, or clinician, although generally the dosage will be selected to achieve local concentrations at the site of action which achieve the desired effect without causing substantial harmful or deleterious side-effects.
  • Administration can be effected in one dose, continuously or intermittently (e.g., in divided doses at appropriate intervals) throughout the course of treatment. Methods of determining the most effective means and dosage of administration are well known to those of skill in the art and will vary with the formulation used for therapy, the purpose of the therapy, the target cell(s) being treated, and the subject being treated. Single or multiple administrations can be carried out with the dose level and pattern being selected by the treating physician, veterinarian, or clinician.
  • a suitable dose of the active compound is in the range of about 100 ng to about 25 mg (more typically about 1 g to about 10 mg) per kilogram body weight of the subject per day.
  • the active compound is a salt, an ester, an amide, a prodrug, or the like
  • the amount administered is calculated on the basis of the parent compound and so the actual weight to be used is increased proportionately.
  • the active compound is administered to a human patient according to the following dosage regime: about 100 mg, 3 times daily. In one embodiment, the active compound is administered to a human patient according to the following dosage regime: about 150 mg, 2 times daily.
  • the active compound is administered to a human patient according to the following dosage regime: about 200 mg, 2 times daily.
  • the conjugate compound is administered to a human patient according to the following dosage regime: about 50 or about 75 mg, 3 or 4 times daily.
  • the conjugate compound is administered to a human patient according to the following dosage regime: about 100 or about 125 mg, 2 times daily.
  • the dosage amounts described above may apply to the conjugate (including the PBD moiety and the linker to the antibody) or to the effective amount of PBD compound provided, for example the amount of compound that is releasable after cleavage of the linker.
  • the appropriate dosage of an ADC of the disclosure will depend on the type of disease to be treated, as defined above, the severity and course of the disease, whether the molecule is administered for preventive or therapeutic purposes, previous therapy, the patient's clinical history and response to the antibody, and the discretion of the attending physician.
  • the molecule is suitably
  • a typical daily dosage might range from about 1 , ug/kg to 100 mg/kg or more, depending on the factors mentioned above.
  • An exemplary dosage of ADC to be administered to a patient is in the range of about 0.1 to about 10 mg/kg of patient weight. For repeated administrations over several days or longer, depending on the condition, the treatment is sustained until a desired suppression of disease symptoms occurs.
  • An exemplary dosing regimen comprises a course of administering an initial loading dose of about 4 mg/kg, followed by additional doses every week, two weeks, or three weeks of an ADC. Other dosage regimens may be useful. The progress of this therapy is easily monitored by conventional techniques and assays.
  • treatment refers generally to treatment and therapy, whether of a human or an animal (e.g., in veterinary applications), in which some desired therapeutic effect is achieved, for example, the inhibition of the progress of the condition, and includes a reduction in the rate of progress, a halt in the rate of progress, regression of the condition, amelioration of the condition, and cure of the condition.
  • Treatment as a prophylactic measure i.e., prophylaxis, prevention is also included.
  • terapéuticaally-effective amount pertains to that amount of an active compound, or a material, composition or dosage from comprising an active
  • prophylactically-effective amount refers to that amount of an active compound, or a material, composition or dosage from comprising an active compound, which is effective for producing some desired prophylactic effect, commensurate with a reasonable benefit risk ratio, when administered in accordance with a desired treatment regimen.
  • the subject/patient may be an animal, mammal, a placental mammal, a marsupial
  • a monotreme e.g., duckbilled platypus
  • a rodent e.g., a guinea pig, a hamster, a rat, a mouse
  • murine e.g., a mouse
  • a lagomorph e.g., a rabbit
  • avian e.g., a bird
  • canine e.g., a dog
  • feline e.g., a cat
  • equine e.g., a horse
  • porcine e.g., a pig
  • ovine e.g., a sheep
  • bovine e.g., a cow
  • a primate simian (e.g., a monkey or ape), a monkey (e.g., marmoset, baboon), an ape (e.g., gorilla, chimpanzee, orangutang, gibbon), or a
  • the subject/patient may be any of its forms of development, for example, a foetus.
  • the subject/patient is a human.
  • R 6' , R 7 ', R 9' , and Y ' are preferably the same as R 6 , R 7 , R 9 , and Y respectively.
  • Y and Y ' are preferably O.
  • R " is preferably a C3-7 alkylene group with no substituents. More preferably R " is a C3, Cs or C alkylene. Most preferably, R" is a C3 or Cs alkylene.
  • R 9 is preferably H.
  • R 6 is preferably selected from H, OH, OR, SH, NH2, nitro and halo, and is more preferably H or halo, and most preferably is H.
  • R 7 is preferably selected from H, OH, OR, SH, SR, NH 2 , NHR, NRR', and halo, and more preferably independently selected from H, OH and OR, where R is preferably selected from optionally substituted C1-7 alkyl, C3-10 heterocyclyl and C5-10 aryl groups. R may be more preferably a C1-4 alkyl group, which may or may not be substituted.
  • a substituent of interest is a C5-6 aryl group (e.g. phenyl). Particularly preferred substituents at the 7- positions are OMe and OCHzPh. Other substituents of particular interest are dimethylamino (i.e. -NMe?); -(OC2H 4 ) q OMe, where q is from 0 to 2; nitrogen-containing Ce heterocyclyls, including morpholino, piperidinyl and N-methyl-piperazinyl.
  • R 12 When there is a double bond present between C2 ' and C3 ⁇ R 12 is selected from:
  • each of R 21 , R 22 and R 23 are independently selected from H, C1-3 saturated alkyl, C2-3 alkenyl, C2-3 alkynyl and cyclopropyl, where the total number of carbon atoms in the R 12 group is no more than 5; , wherein one of R 25a and R 25b is H and the other is selected from: phenyl, which phenyl is optionally substituted by a group selected from halo methyl, methoxy;
  • R 24 is selected from: H; C1-3 saturated alkyl; C2-3 alkenyl; C2-3 alkynyl; cyclopropyl; phenyl, which phenyl is optionally substituted by a group selected from halo methyl, methoxy; pyridyl; and thiophenyl.
  • R 12 is a C5-10 aryl group, it may be a C5-7 aryl group.
  • a C5-7 aryl group may be a phenyl group or a C5-7 heteroaryl group, for example furanyl, thiophenyl and pyridyl.
  • R 12 is preferably phenyl.
  • R 12 is preferably thiophenyl, for example, thiophen-2-yl and thiophen-3-yl.
  • R 12 When R 12 is a C5-10 aryl group, it may be a Ce-io aryl, for example a quinolinyl or isoquinolinyl group.
  • the quinolinyl or isoquinolinyl group may be bound to the PBD core through any available ring position.
  • the quinolinyl may be quinolin-2-yl, quinolin-3-yl, quinolin-4yl, quinolin-5-yl, quinolin-6-yl, quinolin-7-yl and quinolin-8-yl. Of these quinolin-3-yl and quinolin-6-yl may be preferred.
  • the isoquinolinyl may be isoquinolin-1-yl, isoquinolin-3- yl, isoquinolin-4yl, isoquinolin-5-yl, isoquinolin-6-yl, isoquinolin-7-yl and isoquinolin-8-yl. Of these isoquinolin-3-yl and isoquinolin-6-yl may be preferred.
  • R 12 is a Cs-10 aryl group, it may bear any number of substituent groups. It preferably bears from 1 to 3 substituent groups, with 1 and 2 being more preferred, and singly substituted groups being most preferred. The substituents may be any position.
  • R 12 is C5-7 aryl group
  • a single substituent is preferably on a ring atom that is not adjacent the bond to the remainder of the compound, i.e. it is preferably ⁇ or ⁇ to the bond to the remainder of the compound. Therefore, where the C5-7 aryl group is phenyl, the substituent is preferably in the meta- or para- positions, and more preferably is in the para- position.
  • R 12 is a Ce-io aryl group, for example quinolinyl or isoquinolinyl, it may bear any number of substituents at any position of the quinoline or isoquinoline rings. In some embodiments, it bears one, two or three substituents, and these may be on either the proximal and distal rings or both (if more than one substituent).
  • R 12 when R 12 is a C5-10 aryl group is halo, it is preferably F or CI, more preferably CI.
  • R 12 when R 12 is a C5-10 aryl group is ether, it may in some embodiments be an alkoxy group, for example, a C1-7 alkoxy group (e.g. methoxy, ethoxy) or it may in some embodiments be a C5-7 aryloxy group (e.g phenoxy, pyridyloxy, furanyloxy).
  • the alkoxy group may itself be further substituted, for example by an amino group (e.g.
  • R 12 when R 12 is a C5-10 aryl group is C1-7 alkyl, it may preferably be a C1-4 alkyl group (e.g. methyl, ethyl, propryl, butyl).
  • a substituent on R 12 when R 12 is a C5-10 aryl group is C3-7 heterocyclyl, it may in some embodiments be Ce nitrogen containing heterocyclyl group, e.g. morpholino, thiomorphoiino, piperidinyl, piperazinyl. These groups may be bound to the rest of the PBD moiety via the nitrogen atom. These groups may be further substituted, for example, by C1-4 alkyl groups. If the Ce nitrogen containing heterocyclyl group is piperazinyl, the said further substituent may be on the second nitrogen ring atom.
  • R 12 when R 12 is a C5-10 aryl group is bis-oxy-Ci-3 alkylene, this is preferably bis-oxy-methylene or bis-oxy-ethylene.
  • R 12 when R 12 is a C5-10 aryl group is ester, this is preferably methyl ester or ethyl ester.
  • Particularly preferred substituents when R 12 is a C5-10 aryl group include methoxy, ethoxy, fluoro, chloro, cyano, bis-oxy-methylene, methyl-piperazinyl, morpholino and methyl- thiophenyl.
  • Other particularly preferred substituent for R 12 are dimethylaminopropyloxy and carboxy.
  • R 12 groups when R 12 is a C5-10 aryl group include, but are not limited to, 4-methoxy-phenyl, 3-methoxyphenyl, 4-ethoxy-phenyl, 3-ethoxy-phenyl, 4- fluoro-phenyl, 4-chloro-phenyl, 3.4-bisoxymethylene-phenyl, 4-methylthiophenyl, 4- cyanophenyl, 4-phenoxyphenyl, quinolin-3-yl and quinolin-6-yl, isoquinolin-3-yl and isoquinolin-6-yl, 2-thienyl, 2-furanyl, methoxynaphthyl, and naphthyl.
  • Another possible substituted R 12 group is 4-nitrophenyl.
  • R 12 groups of particular interest include 4-(4- methylpiperazin-1 -yl)phenyl and 3.4-bisoxymethylene-phenyl.
  • R 12 When R 12 is C1-5 saturated aliphatic alkyl, it may be methyl, ethyl, propyl, butyl or pentyl. In some embodiments, it may be methyl, ethyl or propyl (n-pentyl or isopropyl). In some of these embodiments, it may be methyl. In other embodiments, it may be butyl or pentyl, which may be linear or branched. When R 12 is C3-6 saturated cycloalkyl, it may be cyclopropyl, cyclobutyl, cyclopentyl or cyclohexyl. In some embodiments, it may be cyclopropyl.
  • each of R 21 , R 22 and R 23 are independently selected from H, C1-3 saturated alkyl, C2-3 alkenyl, C2-3 alkynyl and cyclopropyl, where the total number of carbon atoms in the R 12 group is no more than 5. In some embodiments, the total number of carbon atoms in the R 12 group is no more than 4 or no more than 3. In some embodiments, one of R 21 , R 22 and R 23 is H, with the other two groups being selected from H, C1-3 saturated alkyl, C2-3 alkenyl, C2-3 alkynyl and cyclopropyl.
  • two of R 21 , R 22 and R 23 are H, with the other group being selected from H, C1-3 saturated alkyl, C2-3 alkenyl, C2-3 alkynyl and cyclopropyl.
  • the groups that are not H are selected from methyl and ethyl. In some of these embodiments, the groups that re not H are methyl.
  • R 21 is H.
  • R 22 is H.
  • R 23 is H.
  • R 21 and R 22 are H
  • R 21 and R 23 are H
  • R 22 and R 23 are H.
  • R 12 group of particular interest is: A R 25b
  • R 25a and R 25b are H and the other is selected from: phenyl, which phenyl is optionally substituted by a group selected from halo, methyl, methoxy;
  • the group which is not H is optionally substituted phenyl. If the phenyl optional substituent is halo, it is preferably fluoro. In some embodiment, the phenyl group is unsubstituted.
  • R 24 is selected from: H; Ci- 3 saturated alkyi; C2-3 alkenyl; C2-3 alkynyl; cyclopropyl; phenyl, which phenyl is optionally substituted by a group selected from halo methyl, methoxy; pyridyl; and thiophenyl. If the phenyl optional substituent is halo, it is preferably fluoro. In some embodiment, the phenyl group is unsubstituted.
  • R 24 is selected from H, methyl, ethyl, ethenyl and ethynyl. In some of these embodiments, R 24 is selected from H and methyl.
  • R 12 is , where R 26a and R 26b are independently selected from H, F, C1-4 saturated alkyi, C2-3 alkenyl, which alkyi and alkenyl groups are optionally substituted by a group selected from C1-4 alkyi amido and C1-4 alkyi ester; or, when one of R 26a and R 26b is H, the other is selected from nitrile and a C1.4 alkyi ester.
  • R 26a and R 26b are both H
  • R 26a and R 26b are both methyl.
  • R 26a and R 26b are H, and the other is selected from C1-4 saturated alkyi, C2-3 alkenyl, which alkyi and alkenyl groups are optionally substituted.
  • the group which is not H is selected from methyl and ethyl.
  • R 22 is of formula lla.
  • a in R 22 when it is of formula lla may be phenyl group or a C5-7 heteroaryl group, for example furanyl, thiophenyl and pyridyl. In some embodiments, A is preferably phenyl.
  • Q 2 -X may be on any of the available ring atoms of the C5-7 aryl group, but is preferably on a ring atom that is not adjacent the bond to the remainder of the compound, i.e. it is preferably ⁇ or Y to the bond to the remainder of the compound. Therefore, where the C5-7 aryl group (A) is phenyl, the substituent (Q 2 -X) is preferably in the meta- or para- positions, and more preferably is in the para- position.
  • Q 1 is a single bond.
  • Q 2 is selected from a single bond and -Z-(CH2)n-, where Z is selected from a single bond, O, S and NH and is from 1 to 3.
  • Q 2 is a single bond.
  • Q 2 is -Z- (CH 2 )n-.
  • Z may be O or S and n may be 1 or n may be 2.
  • Z may be a single bond and n may be 1.
  • R 22 is of formula lib.
  • R C1 , R C2 and R C3 are independently selected from H and unsubstituted C1-2 alkyl. In some preferred
  • R C1 , R C2 and R C3 are all H. In other embodiments, R C1 , R C2 and R C3 are all methyl. In certain embodiments, R C1 , R C2 and R C3 are independently selected from H and methyl.
  • R L2' NHNH-R L2' , CONHNH-R 1 2 , , NR N R 12 , wherein R N is selected from the group comprising H and C1.4 alkyl.
  • Particularly preferred groups include: O-R 1 2 , S-R i 2' and NH-R 12' , with H-R L2' being the most preferred group.
  • R 22 is of formula lie. In these embodiments, it is preferred that Q is NR N -R L2' . In other embodiments, Q is 0-R L2' . In further embodiments, Q is S-R 12' . R N is preferably selected from H and methyl. In some embodiment, R N is H. In other words,
  • R N is methyl
  • R 22 may be -A-Ch -X and -A-X.
  • X may be O- R 12' , S-R 1 2 , CO2-R 12' , CO-R L2' and NH-R 1 2 .
  • X may be NH-R L2 .
  • R 10 and R 11 together form a double bond between the nitrogen and carbon atoms to which they are bound.
  • R 11 is OH
  • R 11 is OMe.
  • R 11 is SO z M, where z is 2 or 3 and M is a monovalent
  • R 11a is OH. In some embodiments, R 11a is OMe.
  • R 11a is SO z M, where z is 2 or 3 and M is a monovalent
  • R 20 and R 21 together form a double bond between the nitrogen and carbon atoms to which they are bound.
  • R 20 is H. In some embodiments, R 20 is R c . In some embodiments, R 21 is OH.
  • R 21 is OMe. In some embodiments, R 21 is SO z M, where z is 2 or 3 and M is a monovalent
  • R 30 and R 31 together form a double bond between the nitrogen and carbon atoms to which they are bound.
  • R 31 is OH
  • R 31 is OMe
  • R 31 is SO z M, where z is 2 or 3 and M is a monovalent
  • M is a monovalent pharmaceutically acceptable cation, and is more preferably Na'.
  • z is preferably 3.
  • Preferred conjugates of the first aspect of the present disclosure may have a D L of formula la:
  • R 1 1' , R 20 and R 21 are as defined above;
  • n 1 or 3;
  • R 1a is methyl or phenyl; and R 2a is selected from:
  • Preferred conjugates of the first aspect of the present disclosure may have a D L of formula lb:
  • R Lr , R 20 and R 2 are as defined above;
  • n 1 or 3;
  • R 1a is methyl or phenyl.
  • Preferred conjugates of the first aspect of the present disclosure may have a D L of formula
  • R L2' , R 10 , R 11 , R 30 and R 31 are as defined above
  • n 1 or 3;
  • R 12a is selected from:
  • Preferred conjugates of the first aspect of the present disclosure may have a D L of formula
  • R L2' , R 10 , R 11 , R 30 and R 31 are as defined above
  • n 1 or 3;
  • R 1a is methyl or phenyl
  • R 12a i selected from:
  • Preferred conjugates of the first aspect of the present disclosure may have a D L of formula le:
  • R L2' , R 10 , R 11 , R 30 and R 31 are as defined above
  • n 1 or 3;
  • R 1a is methyl or phenyl
  • R 12a is selected from:
  • FIG. 1 Affinity of ADCT-301 for human CD25 as determined by flow cytometry on concanavalin-A activated CD25-positive human PBMCs.
  • ADCT-301-FITC binding was assessed in a CD25-PE (phycoerythrin) gate across the dilution series by measuring median fluorescent intensity (MFI) in channel FL1 H. Isotype, non-targeting-ADC-FITC was used as the non-binding ADC control. The EC 5 o was ⁇ 0.03 pg/ml (180 pM).
  • Figure 2 In vitro cytotoxicity of ADCT-301 on six lymphoma cell lines as measured by the MTS cell proliferation assay. Cells were incubated with increasing concentrations of ADCT- 301 for 96 hours.
  • Figure 5 Demonstration of CD25-ve bystander cytotoxicity by in vitro conditioned media transfer.
  • Panel 5A shows the cytotoxicity of ADCT-301 or a non- binding ADC to Ramos or Karpas cells.
  • Panel 5B shows the cytotoxicity of CD25-negative Burkitt lymphoma Ramos cells following transfer of ADCT-301 conditioned media.
  • Panel 5C shows the cytotoxicity of CD25-negative Burkitt lymphoma Ramos cells following transfer of non-binding ADC conditioned media.
  • Figure 6 Comparison of CD25-ve bystander cytotoxicity observed with cleavable vs. non- cleavable linkers by in vitro conditioned media transfer.
  • CD25-positive SuDHL-1 cells were found to be equally sensitive to treatment with ADCT-301 (cleavable linker) and NC-1 (ant- CD25 ADC with a non-cleavable linker).
  • Figure 6 shows cytotoxicity of CD25-negative Burkitt lymphoma Ramos cells following transfer of ADCT-301 conditioned media, but not following the transfer of NC-1 conditioned media. The error bars indicate % cell viability ⁇ SD of 3 independent repeats
  • the lnterleukin-2 receptor-a (IL2R-a, CD25) is one of a heterotrimer that makes up the IL2R. It plays a key role in signal transduction pathways involved in the pathogenesis of autoimmunity and graft rejection (Burchill et al Immunol Lett 2007). CD25 is expressed in many hematological malignancies (Srivastava et al Leuk Lymphoma 1994) including B and T cell lymphomas, ATLL and Hairy cell leukemia.
  • CD25 in malignancies is frequently not homogeneous through the tumor cell populations.
  • a non-limiting example of neoplastic disease where CD25 expression is known to be heterogeneous includes Peripheral T cell lymphoma ; Cutaneous T cell lymphoma ; Hodgkin's lymphoma; Diffuse Large B cell lymphoma and Follicular lymphoma; Acute Myeloid Leukemia (AML); Chronic Lymphocytic leukemia etc. (see Cerny, Jan, et al.
  • CD25-positive malignancies has previously been established using radio-immunoconjugates (Dancey et al Clin Cancer Res 2009) and immunotoxins (Kreitman et al J Clin Oncol 2000) utilising antibodies basiliximab and daclizumab. Furthermore, it is known that in many types of tumour, including those of non-hematological origin, activated T-cells are present, including CD25+ve T-cells (see, by way of non-limiting example, Galon, Jerome, et al. "Type, density, and location of immune cells within human colorectal tumors predict clinical outcome.” Science 313.5795 (2006): 1960-1964.; Zhang, Lin, et al.
  • TILs tumor infiltrating lymphocytes
  • ADCT-301 which is composed of a recombinant human lgG1 , HuMax®-TAC against human CD25 attached to a pyrroiobenzodiazepine PBD warhead.
  • the drug-antibody ratio is 2.3 ⁇ 0.3.
  • ADCT-301 is HuMax-TAC-E of WO2014/571 19
  • Relative binding affinity of ADCT-301 was measured by flow cytometry on Concanavalin A- activated CD25-positive lymphocytes.
  • Surface plasmon resonance (SPR, Biacore) was used to measure binding affinity and binding kinetics of HuMax®-TAC and ADCT-301 on recombinant sCD25 ectodomain attached to a gold surface.
  • Cell surface protein copy number of CD25 and CD30 was determined on various lymphoma cell lines by flow cytometric Qifikit ® assay. Cytotoxicity of ADCT-301 on these cell lines was determined by cell proliferation assay (MTS) to determine whether there is a correlation between CD25 copy number and in vitro cytotoxic potency.
  • MTS cell proliferation assay
  • CD25-positive Karpas 299 cells were co-cultured with PKH26-labelled CD25-negative Ramos cells, for 96 hours in the presence or absence of ADCT-301 or non-targeted, control ADC. Readout was Karpas 299 and Ramos cell numbers and the viability of these cells both of which were determined by flow cytometry.
  • the single cell gel electrophoresis (Comet) assay was carried out with ADCT-301 and free warhead to confirm the mode of action of ADCT-301 and to determine the kinetics of DNA cross-linking. Cells were exposed for 2 hours, washed and then incubated in fresh media over a time course. Alternatively to evaluate a dose-response, cells were treated with either ADCT-301 or free warhead for 2 hours, washed and incubated in fresh media for a further 24 hours.
  • ADCT-301 demonstrated was administered as a single dose in SU-DHL-1 and Karpas 299 xenograft and disseminated models and compared to single and repeated AdcetrisTM dosing regimens.
  • the MTD was determined in non-tumor bearing SCID mice.
  • ADCT-301 showed extremely high (picomolar) affinity for the sCD25 ectodomain
  • ADCT-301 was potently cytotoxic against CD25-expressing anaplastic large cell lymphoma lines and Hodgkin's lymphoma cell lines. Although CD25 expression is required for
  • Hodgkin 's Hodgkin's Burkitt ' s
  • Ramos co-cultures demonstrated specific bystander killing of Ramos cells when compared to the same exposure on Ramos cultured alone (Figure 3; Figure 4).
  • Ramos cells are human B lymphocytes of Burkitt's lymphoma.

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