Had prostate Cancer a few years ago. Long talk with the surgeon and he assured me that prostate and cycling are not related. If it were- he would be treating every member of the local cycling club over 50. Prostate problems hit all levels of fitness and all types of sportsmen. He had come across cyclists that had prostate problems but I was the only "Serious" rider he had on his books at the time and he had quite a few that he was dealing with at the time.

However- if you have a prostate problem- then cycling may aggravate it. It never did with me till after the op but anatomical saddles and gritting the teeth through the pain and 10 years later I am still riding.