Here are two LEGIT sources debunking the fish oil prostate cancer link. These came up after a quick google search.
http://www.foxnews.com/health/2014/...lements-really-increase-prostate-cancer-risk/
http://www.drweil.com/drw/u/QAA401331/Does-Fish-Oil-Cause-Prostate-Cancer.html
Fox New is a legit source? I take it you're being sarcastic?
The prostate cancer risk is not the only study showing possible downsides and the fox article doesn't "debunk the link", it just points out that they've not proven the direction of causation. The link remains. How the link works isn't proven.