Antibodies against GPR64 and uses thereof

1. A monoclonal antibody or antigen binding fragment thereof that binds to an epitope of a GPR64 polypeptide comprising the amino acid sequence of SEQ ID NO: 2, wherein said antibody comprises a heavy chain variable region (HCVR) comprising the complementarity determining regions (CDRs) of SEQ ID NO: 17 and a light chain variable region (LCVR) comprising the CDRs of comprising SEQ ID NO: 18.

2. The monoclonal antibody or antigen binding fragment thereof of claim 1 , wherein the monoclonal antibody comprises a heavy chain variable region comprising SEQ ID NO: 17 and a light chain variable region comprising SEQ ID NO: 18.

3. The monoclonal antibody or antigen binding fragment thereof of claim 1 , wherein the monoclonal antibody or antigen binding fragment thereof binds to the GPR64 polypeptide with a binding affinity of less than about 0.01 μM.

4. The monoclonal antibody or antigen binding fragment thereof of claim 1 , wherein the monoclonal antibody or antigen binding fragment thereof is conjugated to an effector moiety selected from the group consisting of a fluorescent label, a radioisotope, and a cytotoxic agent.

5. The monoclonal antibody or antigen binding fragment thereof of claim 4 , wherein the effector moiety is a cytotoxic agent selected from the group consisting of: diphtheria A chain, exotoxin A chain, ricin A chain, abrin A chain, curcin, crotin, phenomycin, enomycin, and auristatin.

6. The monoclonal antibody or antigen binding fragment thereof of claim 4 , wherein the monoclonal antibody or antigen binding fragment thereof is conjugated to auristatin.

7. The monoclonal antibody or antigen binding fragment thereof of claim 1 , wherein the antigen binding fragment is selected from the group consisting of a Fab, a Fab′, a F(ab′) 2 , and a Fv.

8. The monoclonal antibody or antigen binding fragment thereof of claim 1 , wherein the monoclonal antibody is a chimeric antibody or a humanized antibody.

9. The monoclonal antibody or antigen binding fragment thereof of claim 1 , wherein the GPR64 polypeptide is on a cancer cell.

10. A host cell which produces the monoclonal antibody or antigen binding fragment thereof of claim 1 , wherein the host cell is selected from the group consisting of a Chinese Hamster Ovary (CHO) cell, a HeLa cell, an SF9 cell, a 293 cell, a Neurospora cell, a BHK cell, an HUVEC cell, a THP1 cell, an E. coli cell, a Bacillus subtilis cell, a yeast cell, and an insect cell.

11. A pharmaceutical composition comprising a pharmaceutically acceptable excipient and the monoclonal antibody or antigen binding fragment thereof of claim 1 .

12. The pharmaceutical composition of claim 11 , wherein the monoclonal antibody or antigen binding fragment thereof is conjugated to a radioisotope or a cytotoxic agent.

13. The pharmaceutical composition of claim 12 , wherein the cytotoxic agent is auristatin.

14. The pharmaceutical composition of claim 11 , wherein the monoclonal antibody is or a humanized antibody.

15. The monoclonal antibody of claim 1 , wherein the monoclonal antibody is selected from the group consisting of a recombinant IgG (rIgG) antibody, a diabody, a single chain antibody, and a multispecific antibody.

16. The monoclonal antibody or antigen binding fragment thereof of claim 1 , wherein the antibody inhibits proliferation of tumor cells expressing a GPR64 polypeptide comprising the amino acid sequence of SEQ ID NO: 2.

17. The monoclonal antibody or antigen binding fragment thereof of claim 16 , wherein the tumor cells are selected from the group consisting of ovarian cancer cells, Ewing's sarcoma cells, and uterine cancer cells.

18. The monoclonal antibody or antigen binding fragment thereof of claim 1 , wherein the antibody or antigen binding fragment thereof inhibits in vivo proliferation of tumor cells that overexpress the GPR64 polypeptide.

19. The monoclonal antibody or antigen binding fragment thereof of claim 18 , wherein the monoclonal antibody is a chimeric or humanized antibody.

20. The monoclonal antibody or antigen binding fragment thereof of claim 16 , wherein the monoclonal antibody or antigen binding fragment thereof is conjugated to a cytotoxic agent.

21. The monoclonal antibody or antigen binding fragment thereof of claim 20 , wherein the cytotoxic agent is auristatin.

22. The monoclonal antibody of claim 1 , wherein the monoclonal antibody comprises an effector domain that mediates antibody dependent cellular cytotoxicity.

23. A method of inhibiting proliferation of tumor cells expressing a GPR64 polypeptide comprising the amino acid sequence of SEQ ID NO: 2, wherein the tumor cells are of an ovarian carcinoma, a Ewing's sarcoma, or a uterine carcinoma, the method comprising contacting the tumor cells with the monoclonal antibody or antigen binding fragment thereof of claim 1 , wherein the monoclonal antibody or antigen binding fragment thereof is capable of inhibiting the proliferation of said tumor cells.

24. The method of claim 23 , wherein the antibody is conjugated to an effector moiety.

25. The method of claim 23 , wherein the tumor cells are ovarian tissue cells.

26. The method of claim 23 , wherein the monoclonal antibody or antigen binding fragment thereof is conjugated to a cytotoxic agent.

27. The method of claim 26 , wherein the cytotoxic agent is selected from the group consisting of diptheria A chain, exotoxin A chain, ricin A chain, abrin A chain, curcin, crotin, phenomycin, enomycin, and auristatin.

28. The method of claim 23 , wherein the monoclonal antibody or antigen binding fragment thereof is conjugated to auristatin.

29. The method of claim 23 , wherein the monoclonal antibody or antigen binding fragment thereof is conjugated to a radioisotope.

30. The method of claim 23 , wherein the monoclonal antibody or antigen binding fragment thereof comprises a HCVR comprising SEQ ID NO: 17 and a LCVR comprising SEQ ID NO: 18.

31. The method of claim 23 , wherein the monoclonal antibody or antigen binding fragment thereof binds to the GPR64 polypeptide with a binding affinity of less than about 0.01 μM.

32. The method of claim 23 , wherein the antigen binding fragment is selected from the group consisting of a Fab, a Fab′, a F(ab) 2 , and a Fv.

33. The method of claim 23 , wherein the monoclonal antibody is a chimeric antibody or a humanized antibody.

34. The method of claim 23 , wherein the monoclonal antibody is selected from the group consisting of a recombinant IgG (rIgG) antibody, a diabody, a single chain antibody, and a multispecific antibody.

35. The method of claim 23 , wherein the antibody comprises an effector domain that mediates antibody dependent cellular cytotoxicity.

36. The method of claim 23 , wherein the tumor cells are in a patient.

37. The method of claim 36 , wherein the patient is undergoing a therapeutic regimen to treat metastatic ovarian cancer.