Method for treating breast cancer

Abstract

Breast cancer cells lacking ER protein expression, PgR protein expression and/or showing absence of HER2 protein over-expression (i.e., triple-negative breast cancer cells, basal-like) can be efficiently targeted with an anti-KAAG1 antibody and killed upon delivery of a therapeutic moiety. Antibodies and antigen binding fragments that specifically binds to KAAG1 may thus be used for the, detection and therapeutic treatment of breast cancer cells that are negative for at least one of these markers. The use of antibody conjugates in the treatment of triple-negative breast cancer and/or basal-like breast cancer is disclosed herein.

1 . A method of treating breast cancer, the method comprising administering an antibody or an antigen binding fragment thereof, capable of specific binding to Kidney associated antigen 1 (KAAG1) to an individual having a breast cancer that has low expression of the estrogen receptor (ER), of the progesterone receptor (PgR) and/or of human epidermal growth factor receptor 2 (Her2). 
     
     
         2 . (canceled) 
     
     
         3 . The method of  claim 1 , wherein the individual has a breast cancer that is characterized as being negative for estrogen receptor (ER) expression, progesterone receptor (PgR) expression and/or for Her2 overexpression. 
     
     
         4 . A method of treating triple negative breast cancer, the method comprising administering an antibody or an antigen binding fragment thereof capable of specific binding to Kidney associated antigen 1 (KAAG1) to an individual in need. 
     
     
         5 . (canceled) 
     
     
         6 . The method of  claim 4 , wherein the antibody or antigen binding fragment thereof is conjugated with a therapeutic moiety. 
     
     
         7 . (canceled) 
     
     
         8 . The method of  claim 4 , wherein the antibody or antigen binding fragment thereof binds an epitope comprised between amino acids 30 to 84 of KAAG1. 
     
     
         9 . The method of  claim 4 , wherein the antibody or antigen binding fragment thereof is a monoclonal antibody, a chimeric antibody, a human antibody or a humanized antibody or an antigen binding fragment thereof. 
     
     
         10 . The method of  claim 4 , wherein the antibody or antigen binding fragment thereof is administered in combination with an anti-cancer agent. 
     
     
         11 . The method of  claim 4 , wherein the antibody or antigen binding fragment thereof comprises:
 a. a CDRH1 as set forth in SEQ ID NO.:49, a CDRH2 as set forth in SEQ ID NO.:50 or in SEQ ID NO.:212, a CDRH3 as set forth in SEQ ID NO.:51, a CDRL1 as set forth in SEQ ID NO.: 52, a CDRL2 as set forth in SEQ ID NO.:53 and a CDRL3 as set forth in SEQ ID NO.: 54;   b. a light chain variable region as set forth in SEQ ID NO.:48 and a heavy chain variable region as set forth in SEQ ID NO.:46;   c. a light chain variable region as set forth in SEQ ID NO.:186 wherein at least one of the amino acid identified by X is an amino acid substitution in comparison with a corresponding amino acid in the polypeptide set forth in SEQ ID NO.:48 and a heavy chain variable region as set forth in SEQ ID NO.:191 wherein at least one of the amino acid identified by X is an amino acid substitution in comparison with a corresponding amino acid in the polypeptide set forth in SEQ ID NO.:46;   d. a light chain variable region as set forth in SEQ ID NO.:187 and a heavy chain variable region as set forth in SEQ ID NO.:192;   e. a light chain variable region as set forth in SEQ ID NO.:188 and a heavy chain variable region as set forth in SEQ ID NO.:193;   f. a light chain variable region as set forth in SEQ ID NO.: 189 or SEQ ID NO.:190 and a heavy chain variable region as set forth in SEQ ID NO.:194, SEQ ID NO.:195, SEQ ID NO.:196 or SEQ ID NO.:197;   g. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:194;   h. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:195;   i. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:196;   j. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:197;   k. a light chain variable region as set forth in SEQ ID NO.:190 and a heavy chain variable region as set forth in SEQ ID NO.:194;   l. a light chain variable region as set forth in SEQ ID NO.:190 and a heavy chain variable region as set forth in SEQ ID NO.:195;   m. a light chain as set forth in SEQ ID NO.: 199 or SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:202, SEQ ID NO.:203, SEQ ID NO.:204 or SEQ ID NO.:205;   n. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:202;   o. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:203;   p. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:204;   q. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:205;   r. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:202;   s. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:203;   t. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:204 or;   u. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:205.   
     
     
         12 - 31 . (canceled) 
     
     
         32 . The method of  claim 11 , wherein the antibody or antigen binding fragment thereof is conjugated with a therapeutic moiety. 
     
     
         33 . The method of  claim 32 , wherein the therapeutic moiety is a cytotoxic agent. 
     
     
         34 . The method of  claim 6 , wherein the antibody or antigen binding fragment thereof has a high affinity for KAAG1. 
     
     
         35 - 39 . (canceled) 
     
     
         40 . The method of  claim 1 , wherein the antibody or antigen binding fragment thereof is conjugated with a therapeutic moiety. 
     
     
         41 . The method of  claim 40 , wherein the antibody or antigen binding fragment thereof has a high affinity for KAAG1. 
     
     
         42 . The method of  claim 1 , wherein the antibody or antigen binding fragment thereof comprises:
 a. a CDRH1 as set forth in SEQ ID NO.:49, a CDRH2 as set forth in SEQ ID NO.:50 or in SEQ ID NO.:212, a CDRH3 as set forth in SEQ ID NO.:51, a CDRL1 as set forth in SEQ ID NO.: 52, a CDRL2 as set forth in SEQ ID NO.:53 and a CDRL3 as set forth in SEQ ID NO.: 54;   b. a light chain variable region as set forth in SEQ ID NO.:48 and a heavy chain variable region as set forth in SEQ ID NO.:46;   c. a light chain variable region as set forth in SEQ ID NO.:186 wherein at least one of the amino acid identified by X is an amino acid substitution in comparison with a corresponding amino acid in the polypeptide set forth in SEQ ID NO.:48 and a heavy chain variable region as set forth in SEQ ID NO.:191 wherein at least one of the amino acid identified by X is an amino acid substitution in comparison with a corresponding amino acid in the polypeptide set forth in SEQ ID NO.:46;   d. a light chain variable region as set forth in SEQ ID NO.:187 and a heavy chain variable region as set forth in SEQ ID NO.:192;   e. a light chain variable region as set forth in SEQ ID NO.:188 and a heavy chain variable region as set forth in SEQ ID NO.:193;   f. a light chain variable region as set forth in SEQ ID NO.: 189 or SEQ ID NO.:190 and a heavy chain variable region as set forth in SEQ ID NO.:194, SEQ ID NO.:195, SEQ ID NO.:196 or SEQ ID NO.:197;   g. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:194;   h. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:195;   i. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:196;   j. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:197;   k. a light chain variable region as set forth in SEQ ID NO.:190 and a heavy chain variable region as set forth in SEQ ID NO.:194;   l. a light chain variable region as set forth in SEQ ID NO.:190 and a heavy chain variable region as set forth in SEQ ID NO.:195;   m. a light chain as set forth in SEQ ID NO.: 199 or SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:202, SEQ ID NO.:203, SEQ ID NO.:204 or SEQ ID NO.:205;   n. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:202;   o. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:203;   p. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:204;   q. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:205;   r. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:202;   s. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:203;   t. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:204 or;   u. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:205.   
     
     
         43 . The method of  claim 42 , wherein the antibody or antigen binding fragment thereof is conjugated with a therapeutic moiety. 
     
     
         44 . A method of treating basal-like breast cancer, the method comprising administering an antibody or an antigen binding fragment thereof capable of specific binding to Kidney associated antigen 1 (KAAG1) to an individual in need. 
     
     
         45 . The method of  claim 44 , wherein the antibody or antigen binding fragment thereof is conjugated with a therapeutic moiety. 
     
     
         46 . The method of  claim 45 , wherein the antibody or antigen binding fragment thereof has a high affinity for KAAG1. 
     
     
         47 . The method of  claim 44 , wherein the antibody or antigen binding fragment thereof comprises:
 a. a CDRH1 as set forth in SEQ ID NO.:49, a CDRH2 as set forth in SEQ ID NO.:50 or in SEQ ID NO.:212, a CDRH3 as set forth in SEQ ID NO.:51, a CDRL1 as set forth in SEQ ID NO.: 52, a CDRL2 as set forth in SEQ ID NO.:53 and a CDRL3 as set forth in SEQ ID NO.: 54;   b. a light chain variable region as set forth in SEQ ID NO.:48 and a heavy chain variable region as set forth in SEQ ID NO.:46;   c. a light chain variable region as set forth in SEQ ID NO.:186 wherein at least one of the amino acid identified by X is an amino acid substitution in comparison with a corresponding amino acid in the polypeptide set forth in SEQ ID NO.:48 and a heavy chain variable region as set forth in SEQ ID NO.:191 wherein at least one of the amino acid identified by X is an amino acid substitution in comparison with a corresponding amino acid in the polypeptide set forth in SEQ ID NO.:46;   d. a light chain variable region as set forth in SEQ ID NO.:187 and a heavy chain variable region as set forth in SEQ ID NO.:192;   e. a light chain variable region as set forth in SEQ ID NO.:188 and a heavy chain variable region as set forth in SEQ ID NO.:193;   f. a light chain variable region as set forth in SEQ ID NO.: 189 or SEQ ID NO.:190 and a heavy chain variable region as set forth in SEQ ID NO.:194, SEQ ID NO.:195, SEQ ID NO.:196 or SEQ ID NO.:197;   g. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:194;   h. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:195;   i. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:196;   j. a light chain variable region as set forth in SEQ ID NO.:189 and a heavy chain variable region as set forth in SEQ ID NO.:197;   k. a light chain variable region as set forth in SEQ ID NO.:190 and a heavy chain variable region as set forth in SEQ ID NO.:194;   l. a light chain variable region as set forth in SEQ ID NO.:190 and a heavy chain variable region as set forth in SEQ ID NO.:195;   m. a light chain as set forth in SEQ ID NO.: 199 or SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:202, SEQ ID NO.:203, SEQ ID NO.:204 or SEQ ID NO.:205;   n. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:202;   o. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:203;   p. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:204;   q. a light chain as set forth in SEQ ID NO.:199 and a heavy chain as set forth in SEQ ID NO.:205;   r. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:202;   s. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:203;   t. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:204 or;   u. a light chain as set forth in SEQ ID NO.:200 and a heavy chain as set forth in SEQ ID NO.:205.   
     
     
         48 . The method of  claim 47 , wherein the antibody or antigen binding fragment thereof is conjugated with a therapeutic moiety.