Posted: March 13, 2008

Arrowhead Subsidiary, Calando Pharmaceuticals, Submits IND for Clinical Trial with Targeted, Nano-Delivered RNAi Therapeutic for Cancer

(Nanowerk News) Arrowhead Research Corporation announced today that its majority owned subsidiary, Calando Pharmaceuticals, a leading siRNA therapeutics company, submitted an investigational new drug application (IND) to the U.S. Food and Drug Administration to initiate a Phase I clinical trial using their lead anti-cancer compound, CALAA-01. Dr. Anzalone will discuss the IND filing, Calando's clinical plans, and Arrowhead's other 2008 objectives in a webcast presentation following the Annual Meeting of Shareholders today at 10:30 a.m. PT.
'Calando's technology addresses a primary obstacle to the use of siRNA therapeutics: an effective delivery mechanism,' said Dr. Christopher Anzalone, Arrowhead's Chief Executive Officer. 'RNAi could provide a new way to treat a wide range of human diseases, and we believe this is a major step forward for siRNA therapeutics. To our knowledge, this stands to be the first use of siRNA for treatment of cancer in humans. This submission represents an important milestone for Calando and we look forward to starting our work in the clinic.'
The drug candidate is a targeted nanoparticle, comprised of a proprietary, non-chemically-modified siRNA against the M2 subunit of ribonucleotide reductase, a clinically-validated cancer target, and Calando's proprietary siRNA polymer delivery system. The system can be used to systemically deliver any siRNA.
The Phase I study is an open-label, dose-escalation clinical trial in patients with non-resectable or metastatic solid tumors. The primary objectives of the clinical protocol submitted with the IND are to evaluate the safety and tolerability of CALAA-01 in humans. Additional objectives include characterization of pharmacokinetics, evaluation of tumor response, and recommendation of a CALAA-01 dose for future clinical studies. The trial will be conducted at the UCLA Jonsson Cancer Center (UCLA) in Los Angeles, California, and the South Texas Accelerated Research Therapeutics (START) clinic in San Antonio, Texas.
Dr. Anzalone's presentation, followed by a question and answer period, will be broadcast live via the Internet and by teleconference beginning at 10:30 a.m., and a replay will be available for those who are unable to attend the live broadcast. Information on how to access the webcast can be accessed on Arrowhead's website at
About Arrowhead Research Corporation
Arrowhead Research Corporation ( 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.
About Calando Pharmaceuticals Inc.
Calando Pharmaceuticals Inc. ( is using its proprietary technologies in targeted polymeric delivery systems and siRNA design to design and create new, targeted siRNA therapeutics. Small interfering RNAs (siRNA) induce RNA interference, or RNAi, a naturally occurring mechanism within cells to selectively silence and regulate specific genes. The ability to silence genes through RNAi could provide a new way to treat a wide range of human diseases. The company is pursuing this goal through its internal research and development and also through collaborations and partnerships with pharmaceutical and biotechnology companies.
Source: Arrowhead
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