It is a good thing that prostate cancer can be, though it isn't always, the tortoise among cancers. Virulent metastatic cancers, which some forms of prostate cancer are, on the other hand, race through the body like hares, planting diseased new colonies. Normal cells grow and die in an orderly fashion, to be replaced by new ones. In cancer, cell division has gone berserk. Cancer cells have an abnormal (or pathological) structure, detected through a biopsy. They have escaped the mortality of normal cells, proliferate, and may end up killing the host. Let us do whatever we can to keep our own cells from rising against us.