Treatment of hematologic malignancies with an anti-cxcr4 antibody

Abstract

The present disclosure provides human monoclonal antibodies that bind specifically to CXCR4 with high affinity. This disclosure also provides a method for treating a subject afflicted with a CXCR4-expressing cancer, in particular a hematological malignancy such as multiple myeloma, acute myeloid leukemia, or non-Hodgkin's lymphoma, comprising administering to the subject a therapeutically effective amount of a pharmaceutical composition comprising an anti-CXCR4 antibody of the disclosure. The disclosure further provides a kit for treating a cancer in a subject comprising a dose of an anti-CXCR4 antibody and instructions for using the anti-CXCR4 antibody in the therapeutic methods of the disclosure.

What is claimed is: 
     
         1 . A method for inhibiting growth and/or inducing apoptosis of multiple myeloma cells in a subject afflicted with multiple myeloma, said method comprising administering to the subject a therapeutically effective amount of an antibody or an antigen-binding fragment thereof which specifically binds to a human CXCR4 receptor. 
     
     
         2 . The method of  claim 1 , wherein the multiple myeloma is relapsed or refractory multiple myeloma. 
     
     
         3 . The method of  claim 1 , wherein the antibody or fragment thereof is administered to the subject as monotherapy. 
     
     
         4 . The method of  claim 1 , wherein the antibody or fragment thereof is administered to the subject in combination with surgery, radiation and/or one or more therapeutic agents. 
     
     
         5 . The method of  claim 1 , wherein the antibody or fragment thereof inhibits the activity of the CXCR4 receptor and increases sensitivity of the multiple myeloma cell to a chemotherapeutic agent. 
     
     
         6 . The method of  claim 1 , further comprising administering at least one chemotherapeutic agent in combination with the antibody or fragment thereof. 
     
     
         7 . The method of  claim 6 , wherein the at least one chemotherapeutic agent is:
 (a) lenalidomide and dexamethasone; or   (b) bortezomib and dexamethasone.   
     
     
         8 . The method of  claim 1 , wherein the antibody or fragment thereof is a chimeric, humanized, or human antibody or a fragment thereof. 
     
     
         9 . The method of  claim 1 , wherein the antibody or fragment thereof is an IgG1 or IgG4 antibody or a fragment thereof. 
     
     
         10 . The method of  claim 3 , wherein the antibody or fragment thereof is administered to the subject at a dose ranging from about 0.1 to 10 mg/kg body weight. 
     
     
         11 . The method of  claim 10 , wherein the dose is 0.3, 1, 3 or 10 mg/kg body weight. 
     
     
         12 . The method of  claim 7 , wherein the CXCR4 antibody or fragment thereof is administered to the subject in combination with lenalidomide and dexamethasone in a dosage regimen comprising:
 (a) the CXCR4 antibody or fragment (1, 3, or 10 mg/kg) administered as an intravenous infusion on Days 1, 8, 15, 22, 29 and 36 (Cycle 1) and on Days 1, 8, 15, and 22 (Cycle 2 and subsequent cycles);   (b) lenalidomide (25 mg) orally administered for 21 days (Days 15-35; Cycle 1) and Days 1-21 (Cycle 2 and subsequent cycles); and   (c) dexamethasone (40 mg) administered on Days 15, 22, 29, and 36 (Cycle 1) and on Days 1, 8, 15, and 22 (Cycle 2 and subsequent cycles).   
     
     
         13 . The method of  claim 7 , wherein the CXCR4 antibody or fragment thereof is administered to the subject in combination with bortezomib and dexamethasone in a dosage regimen comprising:
 (a) the CXCR4 antibody or fragment (1, 3, or 10 mg/kg) administered as an intravenous infusion on Days 1, 8, 15, 22 and 29 (Cycle 1) and on Days 1, 8 and 15 (Cycle 2 and subsequent cycles);   (b) bortezomib (1.3 mg/m 2 ) administered as an intravenous push on Days 15, 18, 22, and 25 (Cycle 1) and on Days 1, 4, 8, 11 (Cycle 2 and subsequent cycles); and   (c) dexamethasone (20 mg) administered on Days 15, 16, 18, 19, 22, 23, 25 and 26 (Cycle 1) and on Days 1, 2, 4, 5, 8, 9, 11 and 12 (Cycle 2 and subsequent cycles).   
     
     
         14 . The method of  claim 1 , wherein the antibody or fragment thereof is a monoclonal antibody or a fragment thereof. 
     
     
         15 . The method of  claim 1 , wherein the subject is a human. 
     
     
         16 . A kit comprising a dose of an anti-CXCR4 antibody or fragment thereof that specifically binds to a CXCR4 receptor for use in a method of inhibiting growth and/or inducing apoptosis of multiple myeloma cells in a subject afflicted with multiple myeloma and thereby treating the subject, wherein the CXCR4 receptor is expressed on the surface of the multiple myeloma cells in the subject and wherein the method comprises administering to the subject the antibody or fragment thereof for directly inhibiting growth and/or inducing apoptosis of the multiple myeloma cells in the subject, and wherein the kit further comprises instructions for using the anti-CXCR4 antibody according to  claim 1 . 
     
     
         17 . The kit for use according to  claim 16 , wherein the anti-CXCR4 antibody or fragment thereof comprises comprises a heavy chain variable region comprising CDR1, CDR2 and CDR3 domains comprising consecutively linked amino acids having the sequences set forth in SEQ ID NO: 1, SEQ ID NO: 5 and SEQ ID NO: 9, respectively, and a light chain variable region comprising CDR1, CDR2 and CDR3 domains comprising consecutively linked amino acids having the sequences set forth in SEQ ID NO: 13, SEQ ID NO: 17 and SEQ ID NO: 21, respectively. 
     
     
         18 . The kit for use according to  claim 16 , wherein the anti-CXCR4 antibody or fragment thereof comprises a heavy chain variable region comprising consecutively linked amino acids having the sequence set forth in SEQ ID NO: 25, and a light chain variable region comprising consecutively linked amino acids having the sequence set forth in SEQ ID NO: 29. 
     
     
         19 . The kit for use according to  claim 16 , wherein the anti-CXCR4 antibody is BMS-936564. 
     
     
         20 . The kit of  claim 15 , which further comprises at least one chemotherapeutic agent for use in combination with the anti-CXCR4 antibody or fragment thereof.