Humanized anti-ErbB2 antibodies and treatment with anti-ErbB2 antibodies

1. A humanized antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor and comprises the variable light (V L ) domain amino acid sequence in SEQ ID NO: 3 and a variable heavy (V H ) domain.

2. The humanized antibody of claim 1 wherein the V H domain comprises nonhuman hypervariable region residues incorporated into a human V H domain and further comprises a framework region (FR) substitution selected from the group consisting of H69Leu, H71Val, and H73Arg, utilizing the numbering system set forth in Kabat (1991).

3. The humanized antibody of claim 2 comprising FR substitutions H69Leu, H71Val, and H73Arg.

4. The humanized antibody of claim 1 comprising variable heavy (V H ) domain complementarity determining region (CDR) residues GFTFTDYTMX, wherein X is D or S (SEQ ID NO:7), DVNPNSGGSIYNQRFKG (SEQ ID NO:8), and NLGPSFYFDY (SEQ ID NO:9).

5. The humanized antibody of claim 4 comprising V H domain CDR residues GFTFTDYTMD (SEQ ID NO: 14), DVNPNSGGSIYNQRFKG (SEQ ID NO: 8, and NLGPSFYFDY (SEQ ID NO: 9).

6. The humanized antibody of claim 1 comprising the variable heavy (V H ) domain amino acid sequence in SEQ ID NO:4.

7. The humanized antibody of claim 1 which is an intact IgG1 antibody.

8. The humanized antibody of claim 1 which is an antibody fragment.

9. The humanized antibody of claim 8 which is a Fab fragment.

10. A composition comprising the humanized antibody of claim 1 and a pharmaceutically acceptable carrier.

11. An immunoconjugate comprising the humanized antibody of claim 1 conjugated with a cytotoxic agent.

12. The humanized antibody of claim 1 which blocks ligand activation of an ErbB receptor more effectively than a humanized 4D5 antibody.

13. The humanized antibody of claim 1 which blocks ligand activation of an ErbB receptor more effectively than humanized monoclonal antibody huMAb4D5-8.

14. A humanized antibody comprising the variable heavy amino acid sequence in SEQ ID NO:4, and the variable light amino acid sequence in SEQ ID NO:3.

15. The humanized antibody of claim 14 which is an intact IgG1 antibody.

16. A composition comprising the humanized antibody of claim 14 and a pharmaceutically acceptable carrier.

17. A humanized antibody which binds ErbB2 and blocks by 50% or greater binding of monoclonal antibody 2C4 (ATCC HB-12697) to ErbB2, wherein the humanized antibody comprises nonhuman hypervariable region residues incorporated into human variable heavy and light domains and further consists of framework region (FR) substitutions H69Leu, H71 Val, and H73Arg, utilizing the numbering system set forth in Kabat (1991).

18. The humanized antibody of claim 17 which is an intact IgG1 antibody.

19. A composition comprising the humanized antibody of claim 17 and a pharmaceutically acceptable carrier.

20. A humanized antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor and comprises the variable heavy (V H ) domain amino acid sequence in SEQ ID NO: 4 and a variable light (V L ) domain.

21. The humanized antibody of claim 20 which is an intact IgG1 antibody.

22. A composition comprising the humanized antibody of claim 20 and a pharmaceutically acceptable carrier.

23. A humanized antibody which binds ErbB2 and blocks ligand activation of an ErbB receptor more effectively than humanized monoclonal antibody huMAb4D5-8, wherein the humanized antibody comprises nonhuman hypervariable region residues incorporated into human variable heavy and light domains and further consists of framework region (FR) substitutions H69Leu, H71Val, and H73Arg, utilizing the numbering system set forth in Kabat (1991), wherein the humanized antibody comprises variable heavy (V H ) domain complementarity determining region (CDR) residues GFTFTDYTMX, wherein X is D or S (SEQ ID NO:7), DVNPNSGGSIYNQRFKG (SEQ ID NO:8), and NLGPSFYFDY (SEQ ID NO:9); and variable light (V L ) domain CDR residues KASQDVSIGVA (SEQ ID NO:10), SASYX 1 X 2 X 3 , wherein X 1 is R or L, X 2 is Y or E, and X 3 is T or S (SEQ ID NO:11), and QQYYIYPYT (SEQ ID NO:12).