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I've been checking the literature for the past few hours. There have been a number of studies following finasteride as a potential prostate cancer preventative agent. It reduced PSA levels, reduced low-grade prostate cancers, but INCREASED high-risk prostate cancer. There is some controversy about whether or not it just increased the rate of finding the high risk cancers by shrinking the prostate. The biopsies may have had a higher chance of finding the high risk cancers. Or, the finasteride may have actually increased tumor progression.
There is not much data on using finasteride for treatment of recurring disease. It frequently reduces PSA levels in cases of "biochemical failure". It may have a role in management of metastatic disease but there is no good data to that effect yet. It is cheap, which is an advantage.
