Methods of treatment using anti-erbb antibody-maytansinoid conjugates

Abstract

The application concerns methods of treatment using anti-ErbB receptor antibody-maytansinoid conjugates, and articles of manufacture suitable for use in such methods. In particular, the invention concerns ErbB receptor-directed cancer therapies, using anti-ErbB receptor antibody-maytansinoid conjugates.

1 . A method for treatment of cancer that expresses ErbB2 in a mammal, the method comprising administering an anti-ErbB2 antibody-maytansinoid conjugate, wherein the anti-ErbB2 antibody is a growth inhibitory antibody that binds to ErbB2 and inhibits the growth of cancer cells overexpressing ErbB2. 
     
     
         2 . The method of  claim 1 , wherein the anti-ErbB2 antibody binds epitope 4D5 to which the antibody 4D5 (ATCC CRL 10463) binds or binds essentially the same epitope as the antibody 4D5. 
     
     
         3 . The method of  claim 1 , wherein the anti-ErbB2 antibody inhibits the growth of SK-BR-3 breast tumor cells in cell culture by greater than 20% at an antibody concentration of 0.5 to 30 g/ml, where the growth inhibition is determined six days after exposure of the SK-BR-3 cells to the antibody. 
     
     
         4 . The method of  claim 1 , wherein the anti-ErbB2 antibody has antigen binding residues of murine antibody 4D5 (ATCC CRL 10463). 
     
     
         5 . The method of  claim 1 , wherein the anti-ErbB2 antibody is a humanized form of the murine monoclonal antibody 4D5 (ATCC CRL 10463). 
     
     
         6 . The method of  claim 5 , wherein the anti-ErbB2 antibody is huMAb4D5-8. 
     
     
         7 . The method of  claim 1 , wherein the anti-ErbB2 antibody is an antibody fragment. 
     
     
         8 . The method of  claim 1 , wherein the anti-ErbB2 antibody is a human antibody. 
     
     
         9 . The method as in any one of  claims 1  to  8 , wherein the maytansinoid is maytansine, maytansinol or a maytansinol ester. 
     
     
         10 . The method as in any one of  claims 1  to  8 , wherein the maytansinoid is DM1. 
     
     
         11 . The method as in any one of  claims 1  to  8 , wherein the anti-ErbB2 antibody and the maytansinoid are linked by a linking group selected from a disulfide group and a thioether group. 
     
     
         12 . The method as in any one of  claims 1  to  8 , wherein the anti-ErbB2 antibody and maytansinoid are conjugated by a chemical linker selected from N-succinimidyl-3-(2-pyridyldithio)propionate, N-succinimidyl-4-(2-pyridylthio)pentanoate and succinimidyl-4-(N-maleimidomethyl)cyclohexane-1-carboxylate. 
     
     
         13 . The method as in any one of  claims 1  to  8 , wherein the method further comprises treatment with a second anti-ErbB2 antibody. 
     
     
         14 . The method of  claim 13 , wherein the second anti-ErbB2 antibody is an antibody that blocks ligand activation of ErbB2. 
     
     
         15 . The method of  claim 14 , wherein the second anti-ErbB2 antibody is humanized 2C4 (ATCC HB-12697). 
     
     
         16 . The method of  claim 1 , wherein the cancer is selected from benign and malignant tumors. 
     
     
         17 . The method of  claim 1 , wherein the cancer comprises cells which are characterized by overexpression of ErbB2. 
     
     
         18 . The method of  claim 17 , wherein the cancer is characterized as overexpressing ErbB2 with a 2+ score. 
     
     
         19 . The method of  claim 17 , wherein the cancer is characterized as overexpressing ErbB2 with a 3+ score. 
     
     
         20 . The method of  claim 17 , wherein the cancer is breast cancer. 
     
     
         21 - 36 . (canceled)