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Semafore's SF1126 Exhibits Antitumor and Antiangiogenic Activity
Date:1/9/2008

INDIANAPOLIS, Jan. 9 /PRNewswire/ -- Semafore Pharmaceuticals Inc. today announced that a paper published in Cancer Research (2008; Vol. 68, Issue 1: 206-215) reports that SF1126, the company's lead product candidate, exhibits antitumor and antiangiogenic activity.

The paper, entitled "A Vascular Targeted Pan Phosphoinositide 3-Kinase Inhibitor Prodrug, SF1126, with Antitumor and Antiangiogenic Activity," is based on preclinical studies conducted by Semafore and collaborators at Children's Healthcare of Atlanta, Emory University School of Medicine, and M.D. Anderson Cancer Center. Phosphoinositide 3-kinase (PI3K) is a powerful pathway and an emerging cancer target for inhibition. In the studies reported, SF1126 showed favorable pharmacokinetics and pharmacodynamic effects as indicated by inhibition of downstream signaling elements both in vitro and in vivo. In addition, SF1126 displayed potent antitumor and antiangiogenic activity in vivo, in mouse models, against a variety of human cancer cell types, including prostate, breast, neuroblastoma, and glioblastoma.

SF1126 differs from other known PI3K inhibitors in that it has a homing feature designed to localize more drug in the tumor compartment. Based on the studies reported in the paper, SF1126 also significantly enhanced the activity of docetaxel in a combination regiment in a prostate cancer model.

"The data further support our belief that SF1126 is a viable pan PI3K inhibitor as we continue Phase I clinical trials," said Ed Jacobs, Semafore's president and chief executive officer. "SF1126 continues to support the paradigm shift in cancer treatment that will see the application of highly targeted therapeutic drugs that inhibit the powerful PI3K pathway."

About SF1126

SF1126 is a small molecule conjugate containing a pan-PI3K inhibitor that selectively inhibits all PI3K class IA isoforms and other key members of the PI3K superfamily, including DNA-PK and mTOR. A major fact
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SOURCE Semafore Pharmaceuticals Inc.
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