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Wyeth and Progenics Announce Preliminary Clinical Trial Results for RELISTOR Oral and Intravenous Formulations
Date:5/22/2008

enics Pharmaceuticals, Inc. "We await results within the coming months from a second, ongoing phase 2 study involving the oral formulation of RELISTOR that was announced last July to have positive activity in a phase 1 trial."

RELISTOR Intravenous Formulation

The Progenics-conducted phase 3 study of an intravenous formulation of RELISTOR for patients with post-operative ileus (POI) did not meet the primary or secondary end points, confirming the earlier findings of the Wyeth phase 3 intravenous POI study announced on March 12, 2008. Progenics and Wyeth will now study the results of both phase 3 intravenous POI studies to determine whether and how to continue development of this formulation of RELISTOR and this indication.

RELISTOR Franchise

"We are committed to continuing to develop the RELISTOR franchise to help address the unmet medical needs of patients suffering from the gastrointestinal side effects of opioids. Following the results from a second phase 2 clinical trial of another oral formulation, Wyeth and Progenics will further define the continued development plan for oral RELISTOR," says Gary L. Stiles, M.D., Executive Vice President, Chief Medical Officer, Wyeth Pharmaceuticals.

About RELISTOR and Opioids

RELISTOR is a peripherally acting mu-opioid receptor antagonist that counteracts the constipating effects of opioid pain medications in the gastrointestinal tract without affecting their ability to relieve pain.

Opioids provide pain relief by specifically interacting with mu-opioid receptors within the central nervous system (CNS) -- the brain and spinal cord. However, opioids also interact with mu-opioid receptors found outside the CNS, such as those within the gastrointestinal tract, resulting in constipation that can be debilitating. RELISTOR selectively displaces opioids from the mu-opioid receptors outside the CNS, including those located in the gastrointestinal tract, thereby decreasing their constipa
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SOURCE Wyeth Pharmaceuticals
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