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 | |
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| | By: | /s/ John R. Gunn | |
| | | Name: John R. Gunn | |
| | | Title: Executive Vice President | |
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| Dated: January 18, 2013 | AHLB HOLDINGS, LLC, by MEMORIAL SLOAN-KETTERING CANCER CENTER, its sole member |
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| | By: | /s/ John R. Gunn | |
| | | Name: John R. Gunn | |
| | | Title: Executive Vice President | |
