Arrowhead to Present at Upcoming Scientific Conferences

Arrowhead to Present at Upcoming Scientific Conferences

PASADENA, Calif. — May 13, 2013 — Arrowhead Research Corporation (NASDAQ: ARWR), a targeted therapeutics company, today announced that the company will present data on the Dynamic PolyConjugate™ (DPC) siRNA delivery system and the ARC-520 hepatitis B drug candidate at upcoming scientific conferences.

Scheduled conference presentations in May include the following:

15th Annual North American TIDES Conference – Boston, MA, USA, May 12-15, 2013

May 14, 2013 – An oral presentation titled, “Development of DPC Technology for Therapeutic siRNA Delivery,” will be presented by David Lewis, Ph.D., Vice President, Biology;

May 15, 2013 – An oral presentation titled, “Co-injection of a Targeted, Reversibly Masked Endosomolytic Polymer Dramatically Improves the Efficacy of Small Interfering RNA-Conjugates In Vivo,” will be presented by David B. Rozema, Ph.D., Vice President, Chemistry;

Digestive Disease Week 2013 – Orlando, FL, USA, May 18-21, 2013

May 18, 2013 – A poster presentation titled, “Long duration of effect from an RNAi therapeutic to treat chronic hepatitis B virus infection correlates with persistence of the phosphorylated guide strand,” will be presented by Christine Wooddell, Ph.D., Senior Scientist.

About Arrowhead Research Corporation

Arrowhead Research Corporation is a clinical stage targeted therapeutics company with development programs in oncology, obesity, and chronic hepatitis B virus infection. The company is leveraging its platform technologies to design and develop peptide-drug conjugates (PDCs) that specifically home to cell types of interest while sparing off-target tissues, create targeted drugs based on the gene silencing RNA interference (RNAi) mechanism, and work with partners to create improved versions of traditional small molecule drugs.

For more information please visit http://www.arrowheadresearch.com, or follow us on Twitter @ArrowRes. To be added to the Company’s email list to receive news directly, please send an email to ir@arrowres.com

Safe Harbor Statement under the Private Securities Litigation Reform Act:

This news release contains forward-looking statements within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. These statements are based upon our current expectations and speak only as of the date hereof. Our actual results may differ materially and adversely from those expressed in any forward-looking statements as a result of various factors and uncertainties, including our ability to finance our operations, the future success of our scientific studies, our ability to successfully develop drug candidates, the timing for starting and completing clinical trials, rapid technological change in our markets, and the enforcement of our intellectual property rights. Arrowhead Research Corporation’s most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q discuss some of the important risk factors that may affect our business, results of operations and financial condition. We assume no obligation to update or revise forward-looking statements to reflect new events or circumstances.

Contacts: 
Vince Anzalone

Arrowhead Research

626-304-3400
Lauren Glaser

The Trout Group

646-378-2972