KOSAN Biosciences, Inc. Completes $45.5 Million Registered Direct Offering Of Common Stock

HAYWARD, Calif., Feb. 14 /PRNewswire-FirstCall/ -- Kosan Biosciences Incorporated today announced that it has completed its previously announced registered direct offering of 7.0 million shares of common stock at a price of $6.50 per share to institutional investors, for gross proceeds of approximately $45.5 million, excluding placement agent fees and other offering expenses. The shares were offered under the Company’s effective shelf registration statement previously filed with the Securities and Exchange Commission.

Cowen and Company, LLC served as the lead placement agent for this offering. The co-placement agents on the offering were Leerink Swann & Company and Rodman & Renshaw, LLC.

This press release does not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state or jurisdiction. The shares of common stock may only be offered by means of a prospectus. Copies of the final prospectus supplement and accompanying base prospectus can be obtained at the SEC’s website at http://www.sec.gov or from Cowen and Company, LLC or from the offices of Cowen and Company, LLC c/o ADP, 1155 Long Island Avenue, Edgewood, NY 11717, Attn: Prospectus Department (631) 254-7106.

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-862 is currently being studied in a Phase 2 single-agent clinical trial in patients with HER2-positive metastatic breast cancer, as well as a Phase 2 combination trial with Herceptin. KOS-1584, a second candidate designed to improve pharmacokinetics, is in Phase 1 clinical trials in patients with solid tumors. Kosan’s epothilone program is partnered with Roche through a global development and commercialization agreement.

For additional information on Kosan Biosciences, please visit the company’s website at www.kosan.com.

NOTE: Velcade(R) (bortezomib) is a registered trademark of Millennium Pharmaceuticals, Inc.

Herceptin(R) (trastuzumab) is a registered trademark of Genentech, Inc.

Kosan Biosciences Incorporated

CONTACT: Gary S. Titus, Chief Financial Officer, +1-510-731-5335, ormobile, +1-510-731-5373, or titus@kosan.com; or Jane M. Green, VP,Corporate Communications, mobile, +1-415-652-4819, or green@kosan.com, bothof Kosan

MORE ON THIS TOPIC