Prostate cancer is extremely sensitive to the presence of testosterone. So hormone therapy is actually hormonal suppressive therapy. Where we put you on medications that essentially tricks the body into not producing testosterone. In the absence of testosterone, the progression of prostate cancer is halted, usually for a long period of time. The duration of that period varies from individual to individual. We usually use reserve hormone therapy for men who have evidence of extensive disease, including documented spread to other areas of the body, such as the bone.