Arrowhead CEO Invited to Give Keynote Presentation at Rice Alliance Nanotechnology Venture Forum

PASADENA, Calif.–January 22, 2008–Arrowhead Research Corporation (Nasdaq: ARWR), announced today that its President & CEO, Dr. Christopher Anzalone, will present at the 7th Annual Rice Alliance Nanotechnology Forum on January 24, 2008 at 4:00 pm CT in Houston, Texas. Dr. Anzalone will highlight how Arrowhead’s unique business model leverages university nanotechnology into capital efficient nanotech companies making products for electronics, energy and life sciences.

The Rice Alliance for Technology and Entrepreneurship supports entrepreneurs and early-stage technology ventures in Houston and Texas through education, collaboration, and research. Since inception in late 1999, the Rice Alliance has assisted in the launch of over 205 technology companies that have raised more than $300 million in funding. The Annual Nanotechnology Forum is one of the largest venture forums in North America and showcases the 20 most promising companies in nanotechnology.

About Arrowhead Research Corporation

Arrowhead Research Corporation (www.arrowheadresearch.com) is a publicly-traded nanotechnology company commercializing new technologies in the areas of life sciences, electronics, and energy. Arrowhead is building value for shareholders through the progress of majority owned subsidiaries founded on nanotechnologies originally developed at universities. The company works closely with universities to source early stage deals and to generate rights to intellectual property covering promising new nanotechnologies. Currently, Arrowhead has five subsidiaries commercializing nanotech products and applications, including anti-cancer drugs, RNAi therapeutics, fullerene anti-oxidants, carbon-based electronics and compound semiconductor materials.

Safe Harbor Statement under the Private Securities Litigation Reform Act of 1995:

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 the recent economic slowdown affecting technology companies, the future success of our scientific studies, our ability to successfully develop products, rapid technological change in our markets, changes in demand for our future products, legislative, regulatory and competitive developments and general economic conditions. Our Annual Report on Form 10-K and 10-K/A, recent and forthcoming Quarterly Reports on Form 10-Q and 10-Q/A, recent Current Reports on Forms 8-K and 8-K/A, our Registration Statement on Form S-3, and other SEC filings discuss some of the important risk factors that may affect our business, results of operations and financial condition. We undertake no obligation to revise or update publicly any forward-looking statements for any reason.

Contacts

Virginia Dadey; Vice President, Investor Relations
Telephone: 212.541.3707
Email: vdadey@arrowres.com