( PASADENA Calif.--(BUSINESS WIRE)--Mar ...)Arrowhead Subsidiary, Calando Pharmaceuticals Publishes Study on,Targeted, Systemic Delivery of siRNA,Health

PASADENA, Calif.--(BUSINESS WIRE)--Mar 20, 2007 - Arrowhead Research Corporation (NASDAQ:ARWR) announced today that majority-owned subsidiary Calando Pharmaceuticals has published results in the Proceedings of the National Academy of Sciences (PNAS) of the first non-human primate study to use multiple, systemic dosing with Calando's lead siRNA therapeutic candidate.

Calando is using its proprietary technologies in targeted polymeric delivery systems and siRNA design to create new, targeted siRNA therapeutics. Its lead anti-cancer therapeutic candidate contains a linear cyclodextrin polymer, the siRNA, and a targeting agent. The formulation self assembles into nanoparticles that protect the siRNA from nuclease degradation in serum. One important result of the study was the lack of a significant immune response to the siRNA, demonstrating that the formulation is well tolerated at doses much higher than those previously shown to have anti-cancer effects. Calando is expecting to enter clinical trials with this formulation later this year.

Further information about Calando and the study can be found at www.calandopharma.com.

About Arrowhead Research Corporation

Arrowhead Research Corporation (www.arrowheadresearch.com) (NASDAQ:ARWR) 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 four subsidiaries commercializing nanotech products and applications, including anti-cancer drugs, RNAi therapeutics, carbon-based electronics and compound semiconductor materials.

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