Anti-TAT226 antibodies and immunoconjugates

1. A method of diagnosing a cell proliferative disorder, the method comprising:

contacting a biological sample comprising at least one test cell with an effective amount of a composition comprising an antibody that binds to TAT226, or an antigen-binding fragment thereof, wherein the antibody or antigen-binding fragment comprises: a heavy chain variable domain comprising a CDR-H1 comprising the amino acid sequence of SEQ ID NO:4, a CDR-H2 comprising the amino acid sequence of SEQ ID NO:5, and a CDR-H3 comprising an amino acid sequence selected from SEQ ID NO:6-10; a light chain variable domain comprising a CDR-L1 comprising the amino acid sequence of SEQ ID NO:12, a CDR-L2 comprising the amino acid sequence of SEQ ID NO:13, and a CDR-L3 comprising an amino acid sequence selected from SEQ ID NO:14-18; and

determining a level of expression of a TAT226 protein by the at least one test cell by detecting binding of the antibody or antigen-binding fragment to a TAT226 protein on the at least one test cell; and

comparing the level of expression of the TAT226 protein by the at least one test cell to a level of expression of a TAT226 protein by a control cell,

wherein a higher level of expression of the TAT226 protein by the at least one test cell as compared to the control cell indicates the presence of the cell proliferative disorder.

2. The method of claim 1 , wherein the CDR-H3 comprises the amino acid sequence of SEQ ID NO:9, and the CDR-L3 comprises the amino acid sequence of SEQ ID NO:17.

3. The method of claim 1 , wherein CDR-H3 comprises the amino acid sequence of SEQ ID NO:10, and the CDR-L3 comprises the amino acid sequence of SEQ ID NO:18.

4. The method of claim 1 , wherein said antibody or antigen-binding fragment thereof further comprises at least one framework selected from a VH subgroup III consensus framework and a VL subgroup I consensus framework.

5. The method of claim 1 , wherein the antibody comprises a heavy chain variable domain comprising an amino acid sequence selected from SEQ ID NO:21-25 and a light chain variable domain comprising an amino acid sequence selected from SEQ ID NO:26-31.

6. The method of claim 5 , wherein the heavy chain variable domain comprises the amino acid sequence of SEQ ID NO:24, and the light chain variable domain comprises the amino acid sequence of SEQ ID NO:29.

7. The method of claim 5 , wherein the heavy chain variable domain comprises the amino acid sequence of SEQ ID NO:25, and the light chain variable domain comprises the amino acid sequence of SEQ ID NO:30.

8. The method according to claim 1 , wherein said antibody or antigen-binding fragment thereof is a monoclonal antibody or antigen-binding fragment thereof.

9. The method according to claim 1 , wherein said antigen-binding fragment is selected from the group consisting of: Fab, Fab′-SH, Fv, scFv, and (Fab′) 2 fragments.

10. The method of claim 8 , wherein said antibody or antigen-binding fragment thereof is a humanized antibody or antigen-binding fragment thereof.

11. The method of claim 1 , wherein the antibody or antigen-binding fragment comprises a detectable label.

12. The method of claim 11 , wherein the detectable label is selected from the group consisting of: a fluorescent label, a chromophoric label, an electron-dense label, a chemiluminescent label, a radioisotope, an enzyme, and a ligand.

13. The method of claim 1 , wherein the cell proliferative disorder is selected from the group consisting of: ovarian cancer, uterine cancer, brain tumor, and Wilms' tumor.

14. The method of claim 13 , wherein the cell proliferative disorder is associated with increased expression of TAT226 on a surface of the cell.

15. A method of detecting the presence of a TAT226 protein on a surface of a cell, the method comprising:

contacting the cell with an effective amount of a composition comprising an antibody that binds to TAT226, or antigen-binding fragment thereof, wherein the antibody or antigen-binding fragment comprises: a heavy chain variable domain comprising a CDR-H1 comprising the amino acid sequence of SEQ ID NO:4, a CDR-H2 comprising the amino acid sequence of SEQ ID NO:5, and a CDR-H3 comprising an amino acid sequence selected from SEQ ID NO:6-10; a light chain variable domain comprising a CDR-L1 comprising the amino acid sequence of SEQ ID NO:12, a CDR-L2 comprising the amino acid sequence of SEQ ID NO:13, and a CDR-L3 comprising an amino acid sequence selected from SEQ ID NO:14-18; and

detecting binding of the antibody or antigen-binding fragment to the TAT226 protein on the surface of the cell.

16. The method of claim 15 , wherein said antibody or antigen-binding fragment thereof is a monoclonal antibody or antigen-binding fragment thereof.

17. The method of claim 16 , wherein said antigen-binding fragment is selected from the group consisting of: Fab, Fab′-SH, Fv, scFv, and (Fab′) 2 fragments.

18. The method of claim 16 , wherein said antibody or antigen-binding fragment thereof is a humanized antibody or antigen-binding fragment thereof.

19. The method of claim 15 , wherein the cell is a tumor cell.

20. The method of claim 19 , wherein the tumor cell is an ovarian tumor cell, a uterine tumor cell, a brain tumor cell, or a Wilms' tumor cell.

21. The method of claim 18 , wherein the cell is a tumor cell.

22. The method of claim 21 , wherein the tumor cell is an ovarian tumor cell, a uterine tumor cell, a brain tumor cell, or a Wilms' tumor cell.

23. The method of claim 15 , wherein the cell is a xenograft.

24. The method of claim 15 , wherein said contacting takes place in vitro.

25. The method of claim 15 , wherein said contacting takes place in vivo.

26. The method of claim 15 , wherein the antibody or antigen-binding fragment comprises a detectable label.

27. The method of claim 26 , wherein the detectable label is selected from the group consisting of: a fluorescent label, a chromophoric label, an electron-dense label, a chemiluminescent label, a radioisotope, an enzyme, and a ligand.