Memorial Sloan-Kettering Cancer Center SC 13D/A Actinium Pharmaceuticals, Inc.

EXHIBIT 99.2

JOINT FILING AGREEMENT

The undersigned hereby agree that the Schedule 13D with respect to the Common Stock of Cactus Ventures, Inc., dated as of August 22, 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:  August 23, 2013	MEMORIAL SLOAN-KETTERING CANCER CENTER
	By:	/s/ John R. Gunn
		Name:  John R. Gunn
		Title: Executive Vice President

Dated:  August 22, 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

Dated:  August 22, 2013	ACTINIUM HOLDINGS LTD.
	By:	/s/s Michael Sheffery
		Name:  Michael Sheffery
		Title: President and Director