Many physicians and researchers have linked high testosterone levels to an increased risk of prostate cancer. Likewise, high testosterone levels result in the production of greater quantities of dehydrotestosterone that is linked to male pattern baldness in genetically susceptible men.
French researchers, in a study of nearly 700 men (388 with prostate cancer), found that men with male pattern baldness were twice as likely to develop prostate cancer as men with a full head of hair. The mechanisms for this relationship are not clear, so we cannot say at this time whether balding men should be more closely evaluated for prostate cancer. (Annals of Oncology, published online February 15, 2011)