The ones whose patients I've worked with is specifically for a rare form of liver cancer, so no, but that's only because the PI for the study works where I do. I wouldn't be surprised if there are studies for prostate cancer vaccines in the works, I just haven't encountered any.

Edit: probably goes without saying but just in case-- prostate cancer is very screenable, meaning it's quite easy to catch it before its a problem with the tools we have available. If you have a known family history you can probably get them done more frequently for extra precaution too.