>Yes, it probably will become redundant eventually, but as cancer's a genetic thing, it'll be on a patient by patient basis, that means even if a patient's cancer start to develop an immunity to the drug, it'll take a very long time for that immunity to be spread by reproduction...

Eh? I guess "never" is a very long time. Prostate cancer isn't communicable, and while you may pass a propensity to get cancer to your offspring that's irrelevant to the treatment.