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Abraxis BioScience Presents Results from Pre-Clinical Study That,Demonstrates nab-Rapamycin's Robust Antitumor Properties and,Ability to Target Intracellular Sites Such as the mTOR Pathway

LOS ANGELES--(BUSINESS WIRE)--Apr 19, 2007 - Abraxis BioScience, Inc. (NASDAQ:ABBI), an integrated, global biopharmaceutical company, presented first-time data from a pre-clinical study evaluating the toxicity and antitumor effect of nab-rapamycin (ABI-009), an albumin-bound mTOR kinase inhibitor, at the 98th American Association for Cancer Research (AACR) Annual Meeting held April 14-18, 2007 in Los Angeles. Results from the pre-clinical study demonstrated that nab-rapamycin was well-tolerated, showed linear pharmacokinetics, and was highly effective against a number of tumor models in vivo. (Abstract #4719; Nanoparticle Albumin-bound (nab) Rapamycin as an Anticancer Agent).

Leveraging Nab Technology with Rapamycin to Target mTOR Pathway

The mammalian target of rapamycin (mTOR) is a cell-signaling protein that regulates the response of tumor cells to nutrients and growth factors, as well as controls tumor blood supply through effects on vascular endothelial growth factor (VEGF). Rapamycin is an mTOR inhibitor. The mTOR pathway is thought to be overactivated in numerous tumors and plays a critical role in cell survival and resistance to chemotherapy. Inhibition of mTOR activity prevents the signaling to important pathways that control cell growth and lead to a lowering of VEGF levels, thus decreasing the ability of tumors to gain their own blood supply (angiogenesis).

The role of mTOR inhibition has led investigators at Abraxis to explore the use of the nanoparticle albumin-bound (nab(TM)) tumor-targeting technology to enhance the deregulation of mTOR signaling. Nab-rapamycin is also intended to address limitations posed by the poor water solubility of rapamycin and may enable higher concentrations of the drug to reach the tumor tissue. Abraxis plans to commence Phase I clinical trials with nab-rapamycin in 2007.

Abraxis continues to explore the role of nab technology for targeting SPARC an
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