Antibody drug conjugates
The present invention relates to anti-FGFR2 and FGFR4 antibodies, antibody fragments, antibody drug conjugates, and their uses for the treatment of cancer.
1. An antibody drug conjugate of the formula
Ab-(L-(D) m ) n
or a pharmaceutically acceptable salt thereof; wherein
Ab is an antibody or antigen binding fragment thereof that specifically binds to both human FGFR2 and FGFR4; wherein said antibody or antigen binding fragment thereof comprises a heavy chain variable region that comprises: (a) a VH CDR1 of SEQ ID NO: 1, (b) a VH CDR2 of SEQ ID NO: 2, (c) a VH CDR3 of SEQ ID NO: 3, (d) a VL CDR1 of SEQ ID NO: 11, (e) a VL CDR2 of SEQ ID NO: 12, and (f) a VL CDR3 of SEQ ID NO: 13, wherein the CDR is defined in accordance with the Kabat definition;
L is a linker;
D is a drug moiety;
m is an integer from 1 to 8; and
n is an integer from 1 to 10.
2. The antibody drug conjugate of claim 1 , wherein said m is 1.
3. The antibody drug conjugate of claim 1 , wherein said n is 3 or 4.
4. The antibody drug conjugate of claim 1 , wherein said antibody or antigen binding fragment specifically binds to all isoforms of human FGFR2.
5. The antibody drug conjugate of claim 1 , wherein said antibody or antigen binding fragment specifically binds to an epitope on human FGFR2 comprising amino acid residues 176 (Lys) and 210 (Arg) of SEQ ID NO:137.
6. The antibody drug conjugate of claim 1 , wherein said antibody or antigen binding fragment recognizes amino acid residues 173 (Asn), 174 (Thr), 175 (Val), 176 (Lys), 178 (Arg), 208 (Lys), 209 (Val), 210 (Arg), 212 (Gin), 213 (His), 217 (Ile), and 219 (Glu) of SEQ ID NO:137.
7. The antibody drug conjugate of claim 1 , wherein said antibody or antigen binding fragment specifically binds to an epitope of human FGFR2 comprising SEQ ID NO:136 or SEQ ID NO:141.
8. The antibody drug conjugate of claim 1 , wherein said antibody or antigen binding fragment specifically binds to D1 and D2 domains of human FGFR4.
9. The antibody drug conjugate of claim 1 , wherein said antibody or antigen binding fragment thereof comprises a VH region of SEQ ID NO: 7 and a VL region of SEQ ID NO: 17.
10. The antibody drug conjugate of claim 9 , wherein said antibody consists of a heavy chain of SEQ ID NO: 9 and a light chain of SEQ ID NO: 19.
11. The antibody drug conjugate of claim 1 , wherein said antibody or antigen binding fragment has enhanced ADCC activity as compared to an antibody consisting of a heavy chain of SEQ ID NO: 9 and a light chain of SEQ ID NO: 19.
12. The antibody drug conjugate of claim 1 , wherein said antibody is a human antibody.
13. The antibody drug conjugate of claim 1 , wherein said antibody is a monoclonal antibody.
14. The antibody drug conjugate of claim 1 , wherein said linker is selected from the group consisting of a cleavable linker, a non-cleavable linker, a hydrophilic linker, a procharged linker and a dicarboxylic acid based linker.
15. The antibody drug conjugate of claim 14 , wherein the linker is derived from a cross-linking reagent selected from the group consisting of N-succinimidyl-3-(2-pyridyldithio)propionate (SPDP), N-succinimidyl 4-(2-pyridyldithio)pentanoate (SPP), N-succinimidyl 4-(2-pyridyldithio)butanoate (SPDB), N-succinimidyl-4-(2-pyridyldithio)-2-sulfo-butanoate (sulfo-SPDB), N-succinimidyl iodoacetate (SIA), N-succinimidyl(4-iodoacetyl) aminobenzoate (SIAB), maleimide PEG NHS, N-succinimidyl 4-(maleimidomethyl) cyclohexanecarboxylate (SMCC), N-sulfosuccinimidyl 4-(maleimidomethyl) cyclohexanecarboxylate (sulfo-SMCC) or 2,5-dioxopyrrolidin-1-yl 17-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)-5,8,11,14-tetraoxo-4,7,10,13-tetraazaheptadecan-1-oate (CX1-1).
16. The antibody drug conjugate of claim 15 , wherein said linker is derived from the cross-linking reagent N-succinimidyl 4-(maleimidomethyl) cyclohexanecarboxylate (SMCC).
17. The antibody drug conjugate of claim 1 , wherein said drug moiety is selected from a group consisting of a V-ATPase inhibitor, a pro-apoptotic agent, a Bcl2 inhibitor, an MCL1 inhibitor, a HSP90 inhibitor, an IAP inhibitor, an mTor inhibitor, a microtubule stabilizer, a microtubule destabilizer, an auristatin, a dolastatin, a maytansinoid, a MetAP (methionine aminopeptidase), an inhibitor of nuclear export of proteins CRM1, a DPPIV inhibitor, proteasome inhibitors, inhibitors of phosphoryl transfer reactions in mitochondria, a protein synthesis inhibitor, a kinase inhibitor, a CDK2 inhibitor, a CDK9 inhibitor, a kinesin inhibitor, an HDAC inhibitor, a DNA damaging agent, a DNA alkylating agent, a DNA intercalator, a DNA minor groove binder and a DHFR inhibitor.
18. The antibody drug conjugate of claim 17 , wherein the cytotoxic agent is a maytansinoid.
19. The antibody drug conjugate of claim 18 , wherein the maytansinoid is N(2′)- deacetyl-N(2′)-(3-mercapto-1-oxopropyl)-maytansine (DM1) or N(2′)-deacetyl-N2-(4-mercapto-4-methyl-1-oxopentyl)-maytansine (DM4).
20. The antibody drug conjugate of claim 1 having the following formula:
wherein n is 1 to 10; or a pharmaceutically acceptable salt thereof.
21. A pharmaceutical composition comprising the antibody drug conjugate of claim 1 and a pharmaceutically acceptable carrier.
22. The pharmaceutical composition of claim 21 wherein said composition is prepared as a lyophilisate.
23. The pharmaceutical composition of claim 22 , wherein said lyophilisate comprises said antibody drug conjugate, sodium succinate, and polysorbate 20.
24. An antibody or antigen binding fragment thereof comprising a heavy chain variable region that comprises: (a) a VH CDR1 of SEQ ID NO: 1, (b) a VH CDR2 of SEQ ID NO: 2, and (c) a VH CDR3 of SEQ ID NO: 3, and a light chain variable region that comprises: (d) a VL CDR1 of SEQ ID NO: 11, (e) a VL CDR2 of SEQ ID NO: 12, and (f) a VL CDR3 of SEQ ID NO: 13, wherein the CDR is defined in accordance with the Kabat definition.
25. The antibody or antigen binding fragment thereof of claim 24 that specifically binds to FGFR2 and FGFR4.
26. The antibody or antigen binding fragment of claim 25 , wherein said antibody or antigen binding fragment specifically binds to an epitope on human FGFR2 comprising amino acid residues 176 (Lys) and 210 (Arg) of SEQ ID NO:137.
27. The antibody or antigen binding fragment of claim 26 , wherein said antibody or antigen binding fragment specifically binds to D1 and D2 domains of human FGFR4.
28. The antibody or antigen binding fragment of claim 24 , wherein said antibody is a human antibody.
29. The antibody or antigen binding fragment of- claim 24 , wherein said antibody is a monoclonal antibody.
30. The antibody or antigen binding fragment of claim 24 , wherein said antibody or antigen binding fragment is a single chain antibody (scFv).
31. A diagnostic reagent comprising the antibody or antigen binding fragment thereof of claim 24 , which is labeled.
32. The diagnostic reagent of claim 31 , wherein the label is selected from the group consisting of a radiolabel, a fluorophore, a chromophore, an imaging agent, and a metal ion.