Exhibit 99.1
 
JOINT FILING AGREEMENT
 
     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