Link between omega-3 fatty acids and prostate cancer risk
http://www.sciencedaily.com/releases/2013/07/130710183637.htm

A large study at Fred Hutchinson Cancer Research Center has shown that high blood 
concentrations of omega-3 fatty acids result in an increased risk of prostate cancer.

The levels of omega-3s tested were roughly equivalent to eating salmon twice a week
and resulted in an increased risk of about 40 percent.

This review by Alan Detwiler, bio at http://www.smashwords.com/profile/view/alandetwiler