Conference Calls

Arrowhead Pharmaceuticals, Inc.

Arrowhead Research Clinical Data Presentations at the 2010 ASCO Annual Meeting

5:00 PM

Arrowhead Research Corp. (ARWR) to present interim data from the phase 1 clinical trial conducted by its majority-owned subsidiary, Calando Pharmaceuticals, at the 2010 American Society of Clinical Oncology (ASCO) Annual Meeting. The event of scheduled is begin at 5:00 PM ET on June 6, 2010. The abstract can be accessed at ASCO''s site at: http://abstract.asco.org/AbstView_74_44614.html