EXHIBIT 99.1
 
JOINT FILING AGREEMENT
 
The undersigned hereby agree that the Schedule 13D with respect to the Common Stock of Cactus Ventures, Inc., dated as of January 18, 2013, is, and any amendments thereto signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(f) under the Securities Exchange Act of 1934.
 
 
  Dated:  January 18, 2013
MEMORIAL SLOAN-KETTERING CANCER CENTER
  
       
       
 
By:
/s/ John R. Gunn
  
   
Name:  John R. Gunn
  
   
Title: Executive Vice President
  
       
 
 
 Dated:  January 18, 2013
AHLB HOLDINGS, LLC, by MEMORIAL SLOAN-KETTERING CANCER CENTER, its sole member
       
       
 
By:
/s/ John R. Gunn
  
   
Name:  John R. Gunn
  
   
Title: Executive Vice President