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Kosan Presents Promising Phase 1 Data on Second-Generation Hsp90,Inhibitor, Alvespimycin, Showing Antitumor Activity in Refractory,Breast and Ovarian Cancers at ASCO

es that regulatory filings to support initiation of this clinical trial will be completed by mid-year 2007. Kosan plans to initiate a larger, international Phase 2/3 trial of alvespimycin in combination with trastuzumab in patients with HER2-positive metastatic breast cancer later in 2007.

Kosan also plans to pursue development of alvespimycin as a treatment for patients with acute myeloid leukemia (AML).

Kosan is also testing alvespimycin delivered orally in a Phase 1 dose escalation trial on both daily and every other day schedules. While dose escalation continues in this trial, early results have shown prolonged stable disease in patients with fibrosarcoma, hemangioendothelioma, melanoma and renal cell carcinoma with a favorable side effect profile.

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. Kosan's proprietary formulation of tanespimycin (KOS-953) is currently in Phase 1 and 2 clinical trials, primarily for multiple myeloma in combination with Velcade(R) (bortezomib) and HER2-positive metastatic breast cancer in combination with Herceptin(R) (trastuzumab). In addition, intravenous and oral formulations of Kosan's second-generation Hsp90 inhibitor, alvespimycin (KOS-1022), are being evaluated in Phase 1 clinical trials.

Epothilones inhibit cell division with 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 epothilone program is partnered with Roche through a global devel
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1. Kosan Presents Phase 1 Data Showing Promising Antitumor Activity and Safety Profile of Epothilone KOS-1584 at ASCO
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