Are you taking it? It's approved so far for metastatic castrate-resistant PC. In clinical trials, it added 4 months to men's lives. That figure is a little deceptive, because many men in the study were too far gone already and it had no effect, while for many it had a much longer effect. It seems to me that the earlier one takes it, the better, and I know it's in clinical trials now for use earlier in the process, such as before there are known metastases, before hormone therapy fails, or even before hormone therapy begins. It's an immune stimulant and can have some very nasty side-effects (an immune cascade) in some individuals.