I think every urologist should read this study before they put their patients on anti-androgenic drugs to treat BPH and early stage prostate cancer.
Low free testosterone levels predict disease reclassification in men with prostate cancer undergoing active surveillance - San Francisco - 2014 - BJU International - Wiley Online Library
https://www.sciencedaily.com/releases/2014/05/140505094213.htm
"...These results suggest low levels of testosterone are associated with more aggressive prostate cancer. This contradicts long-held beliefs that high testosterone is risky for prostate cancer, and low testosterone is protective," said Dr. San Francisco. The results of this study provide valuable information to clinicians and their patients concerning risk factors for prostate cancer progression in men undergoing active surveillance. "In borderline cases, the presence of low values of free testosterone may help determine whether it is more prudent to initiate treatment rather than continue observation," said Dr. San Francisco."
Low free testosterone levels predict disease reclassification in men with prostate cancer undergoing active surveillance - San Francisco - 2014 - BJU International - Wiley Online Library
https://www.sciencedaily.com/releases/2014/05/140505094213.htm
"...These results suggest low levels of testosterone are associated with more aggressive prostate cancer. This contradicts long-held beliefs that high testosterone is risky for prostate cancer, and low testosterone is protective," said Dr. San Francisco. The results of this study provide valuable information to clinicians and their patients concerning risk factors for prostate cancer progression in men undergoing active surveillance. "In borderline cases, the presence of low values of free testosterone may help determine whether it is more prudent to initiate treatment rather than continue observation," said Dr. San Francisco."