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Semafore Pharmaceuticals Reports Positive Interim Results from a Phase I Study of SF1126, a Targeted Pan-PI3K Inhibitor, in Patients with Advanced Solid Tumors
Date:6/4/2008

SF1126 is a small-molecule conjugate containing a pan-PI3K inhibitor that selectively inhibits all PI3K class I isoforms. In addition to inhibiting PI3 kinase, SF1126 inhibits mTOR, DNA-PK, Polo-like 1 kinases, PIM1 and CK2 - all believed to play significant roles in the control of cell survival/proliferation signals and in cancer. SF1126 is the only PI3K inhibitor demonstrated in preclinical studies to cause an oxidative stress mechanism in cancer cells, resulting in decreased proliferation and apoptosis. A major factor in tumor resistance to approved chemotherapy agents is thought to be the activation of the PI3K/PTEN pathway. As a result, it is believed that inhibiting this pathway with SF1126 could resensitize the cancer cells to approved anticancer agents and lead to possible synergistic anticancer activity. Clinical combination studies with SF1126 are being planned.

About Semafore Pharmaceuticals

Semafore Pharmaceuticals is a clinical-stage drug discovery and development company focused on small-molecule modulators of the PI3 kinase and PTEN cell signaling pathway, a promising target pathway for multiple disorders, including the company's focus - cancer. Semafore is one of the first biopharmaceutical companies to focus on both PI3K and PTEN and has successfully discovered and is developing a portfolio of drug candidates addressing these targets.

Semafore is actively seeking partnerships or other strategic alliances to help fulfill the promise of SF1126. For more information visit the company's Web site at http://www.SemaforePharma.com .

Contacts:

Semafore Pharmaceuticals Inc.

Sandi Yurichuk

(650) 576-5769

sandi.yurichuk@semaforepharma.com

Russo Partners LLC

David Schull

(212) 845-4271

david.schull@russopartn
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SOURCE Semafore Pharmaceuticals Inc.
Copyright©2008 PR Newswire.
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