The prevention of prostate cancer is conceivable. Finasteride, even though it diminishes the risk of cancer in the male adult, cannot be used as a prophylaxis in chemoprevention so far as we do not know if they produce more aggressive cancers. On the other hand, weight control, through a varied and balanced diet, rich in lycopene, soja beans, omega 3 acid, selenium, vit E, physical and sexual activity and no smoking are without risks, efficient and commendable.