Ah, I hadn't thought about it that way although it makes sense now. Even so, there aren't that many variations of treatment for advanced PCa .... HT or no HT, chemo or no chemo, early chemo or late chemo, abi or enza up front or held back until hormone independent, immunotherapy when everything else fails.
I have to say, if I was a cancer charity with a lot of money in the bank, I would be investing it in research labs like Oncologica; the brain tumour charity that I am involved with has been funding some immunotherapy research at Leeds.