( TARRYTOWN N.Y.--(BUSINESS WIRE)--May 1...)Progenics Announces Positive Results in Clinical Trial of Novel HIV,Therapy,Health

TARRYTOWN, N.Y.--(BUSINESS WIRE)--May 1, 2007 - Progenics Pharmaceuticals, Inc. (NASDAQ: PGNX) today announced positive results from the first clinical trial of its investigational drug, PRO 140, in individuals infected with the human immunodeficiency virus (HIV), the causative agent of AIDS. Patients receiving a single 5.0 mg/kg dose of PRO 140 achieved an average maximum decrease of viral concentrations in the blood of 98.5% (1.83 log10), with individual reductions ranging up to 99.7% (2.5 log10). In these patients, reductions in viral load of greater than 90% (1.0 log10) on average persisted for two to three weeks after dosing. In addition, PRO 140 was generally well tolerated in this phase 1b proof-of-concept study. PRO 140 was granted Fast Track status from the U.S. Food and Drug Administration (FDA), and Progenics plans to initiate additional clinical testing in the second half of 2007.

"This study establishes clear proof of concept for PRO 140 as a potent antiretroviral agent with extended activity following a single dose," said Scott M. Hammer, M.D., Chief, Division of Infectious Diseases and Harold C. Neu Professor of Medicine, Columbia University College of Physicians and Surgeons, New York City. "The primary goal of HIV therapy is to provide maximal and durable suppression of viral replication. Based on this study, PRO 140 has the potential to add to the armamentarium of drugs that can help achieve this goal in patients living with HIV, including those whose treatment options are limited by drug resistance."

PRO 140 is a humanized monoclonal antibody that binds CCR5, the principal portal used by HIV to enter cells. Viral-entry inhibition using a long-lived antibody represents a promising novel approach to treating HIV infection. Unlike currently available antiretroviral drugs, PRO 140 does not target the virus, but rather binds to the CCR5 receptor on healthy immune system cells and thereby pr
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