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Testosterone Fuel for Prostate Cancer Stalls Tumors in Surprise

The hormone testosterone, which fuels prostate cancer growth, unexpectedly stymies the disease in certain cases, according to researchers who found it made tumors more vulnerable to treatment in some patients.

Prostate cancer is the most common tumor in men. The American Cancer Society projects 220,800 men will be diagnosed with the disease in 2015. The cancer typically turns deadly after tumors stop responding to drugs that block production of testosterone and its receptors, an approach called androgen deprivation therapy that has been standard for 70 years.