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Kosan's Hsp90 Inhibitor, Tanespimycin, Shows 55% Clinical Benefit in Patients With Trastuzumab-Refractory Metastatic Breast Cancer
Date:12/17/2007

losuppression, cardiotoxicity and peripheral neuropathy.

Accrual is continuing in this Phase 2 trial. Up to 20 additional patients are anticipated to be treated with the Injectable Suspension formulation of tanespimycin.

About Kosan

Kosan Biosciences is a biotechnology company advancing two new classes of anticancer agents through clinical development -- Hsp90 (heat shock protein 90) inhibitors and epothilones. Kosan is leveraging its proprietary discovery platform to generate a pipeline of potentially significant product candidates, primarily in the area of oncology.

Hsp90 inhibitors have a novel mechanism of action targeting multiple pathways involved in cancer cell growth and survival. Tanespimycin (KOS-953) is being tested in combination with bortezomib (Velcade(R)) in patients with multiple myeloma in a registration program called TIME. Tanespimycin is also being studied in HER2-positive metastatic breast cancer in combination with trastuzumab (Herceptin(R)), and as monotherapy in metastatic melanoma. Intravenous and oral formulations of Kosan's second-generation Hsp90 inhibitor, alvespimycin (KOS-1022), are being evaluated in Phase 1 clinical trials in hematologic and solid tumors and in HER2-positive metastatic breast cancer.

Epothilones inhibit cell division through a mechanism of action similar to taxanes, one of the most successful classes of anti-tumor agents. KOS-1584 is in Phase 1 clinical trials in patients with solid tumors.

Kosan's motilin agonist, KOS-2187, licensed to Pfizer, is in a Phase 1 safety trial, with plans to pursue development in gastroesophageal reflux disease (GERD).

This press release contains forward-looking statements within the meaning of the "safe harbor" provisions of the Private Securities Litigation Reform Act of 1995 (the "Act"). Such forward-looking statements include but are not limited to statements regarding the further development and potential
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SOURCE Kosan Biosciences Incorporated
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