The Evidence as it Now Stands
For over sixty-five years, there has been a fear that testosterone therapy will cause new prostate cancers to arise or hidden ones to grow. Although no large-scale studies have yet been performed to provide a definitive verdict on the safety of testosterone therapy, it is quite remarkable to discover that the long-standing fear about testosterone and prostate cancer has little scientific support. The old concepts, taken as gospel, do not stand up to critical examination. I believe the best summary about the risk of prostate cancer from testosterone therapy, based on published evidence at the time this book is written, is as follows:
Low blood levels of testosterone do not protect against prostate cancer and, indeed, may increase the risk.
High blood levels of testosterone do not increase the risk of prostate cancer.
Treatment with testosterone does not increase the risk of prostate cancer, even among men who are already at high risk for it.
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