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New targeted therapy effective in treating advanced prostate cancer
Date:4/14/2010

receptor signaling drives CRPC and that a substantial number of CRPC tumors that progress despite multiple hormone and chemotherapy treatments remain dependent on androgen receptor signaling for growth," said study co-author, Charles Sawyers, MD, Chair of Memorial Sloan-Kettering's Human Oncology and Pathogenesis Program and a Howard Hughes Medical Institute investigator.

The drug was co-invented by Dr. Sawyers and Michael Jung, PhD, Professor of Chemistry at the University of California, Los Angeles. Their research originally demonstrated that CRPC cells have increased expression of the androgen receptor and that elevated expression of this receptor may contribute to disease progression due to a developed resistance to hormone treatment. Their collaboration led to the discovery of a number of nonsteroidal, small molecule antiandrogen compounds, including MDV3100.

In the current study, 140 patients were treated with doses of MDV3100 ranging from 30 to 600 mg daily. PET imaging, bones scans, and blood tests were used to assess the antitumor effects of the drug, which were observed at all dosages. Investigators reported declines in PSA of at least 50 percent in more than half of the patients and tumor regressions in 22 percent of the patients. Overall, two-thirds of patients had partial remissions or stable disease in tumors that had spread to soft tissue or bone.

The findings also showed that the number of circulating tumor cells fell in 49 percent of patients, and 91 percent of patients who initiated therapy with favorable counts retained favorable counts during treatment. This is important because previous research shows that changes in circulating tumor cell counts after treatment were more predictive of survival than were changes in PSA, with favorable post-treatment counts associated with a 21-month median survival.

The drug was generally well tolerated, with nausea, constipation, diarrhea, and anorexia being the most common mild side effe
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Contact: Jeanne DAgostino
dagostij@mskcc.org
212-639-3573
Memorial Sloan-Kettering Cancer Center
Source:Eurekalert

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