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

An experimental drug is showing promise for the treatment of men with an aggressive form of advanced prostate cancer. A new multicenter study has concluded that the targeted therapy MDV3100 is safe and effective for patients with castration-resistant prostate cancer (CRPC), known for its poor prognosis and limited treatment options. The research, led by investigators at Memorial Sloan-Kettering Cancer Center, appears early online and in an upcoming edition of The Lancet.

According to the findings of the Phase 1-2 study, MDV3100 not only shrank patients' tumors, but also reduced serum levels of the tumor marker prostate-specific antigen (PSA), stabilized disease that had spread to soft tissues and the bone, and reduced the number of circulating tumor cells in the blood.

"We were encouraged to see antitumor activity in men whose disease had spread to other parts of the body after either becoming resistant to previous hormone treatments or progressing following chemotherapy," said the study's lead author Howard Scher, MD, Chief of the Genitourinary Oncology Service at Memorial Sloan-Kettering. "These findings strengthen the drug's potential to change the outlook for a group of patients who currently have limited effective treatment options from which to choose."

According to the research, MDV3100 slows tumor growth and induces tumor cells to die in men with CRPC, or hormone-refractory disease, which depends on male hormones to grow, but is unresponsive or becomes resistant to standard therapies used to lower or block those hormones. MDV3100 works by blocking testosterone from binding to the androgen (male hormone) receptor, stopping the movement of the androgen receptor to the nucleus of prostate cancer cells, preventing the receptor from binding to DNA, and inducing cancer cell death, even when the expression of the androgen receptor is elevated.

"This study validates what our preclinical studies have suggested: that sustained androgen
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Contact: Jeanne DAgostino
dagostij@mskcc.org
212-639-3573
Memorial Sloan-Kettering Cancer Center
Source:Eurekalert

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