Tommy Chong had the same thing and beat it using hemp oil. It might be worth looking into his story, he talks about it openly.
http://www.wakingtimes.com/2013/05/15/tommy-chong-beats-prostate-cancer-with-diet-and-hemp-oil/
That treatment was studied and published in the National Center for Biotechnology Information database in 2012. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3339795/