ex99_1.htm

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, the undersigned agree to the joint filing of a Statement on Schedule 13G (including any and all amendments thereto) with respect to the Common Stock, $0.001 par value per share, of OncoGenex Pharmaceuticals, Inc. and further agree to the filing of this agreement as an exhibit thereto. In addition, each party to this Agreement expressly authorizes each other party to this Agreement to file on its behalf any and all amendments to such Statement on Schedule 13G.

Date: March 22, 2012	TANG CAPITAL PARTNERS, LP
	By:	Tang Capital Management, LLC
	Its:	General Partner

	By:	/s/ Kevin C. Tang
		Name:	Kevin C. Tang
		Title:	Manager

	TANG CAPITAL MANAGEMENT, LLC
	By:	/s/ Kevin C. Tang
		Name:	Kevin C. Tang
		Title:	Manager

	/s/ Kevin C. Tang
	Name:	Kevin C. Tang