Both diseases are scarily below-the-belt, but what is the link between them?

A large, retrospective population study has suggested that it may actually be specific prostate cancer treatments (made to lower male sex hormones) that increase a man’s risk of developing colorectal cancer.

From our December 2010 Clinical Research Update:

Men treated with gonadotropin-releasing hormone (GnRH) agonists or surgical removal of their testicles (orchiectomy) to lower their testosterone and PSA levels experienced an increased risk of colorectal cancer of about 20 to 40%… Compared with prostate cancer patients who received no hormone treatments, those who had GnRH agonist therapy for 13 to 25 months had a 19% increase in colorectal cancer risk, those who had GnRH agonist therapy for longer than 25 months had a 31% increase in risk, and those who had orchiectomy had a 37% increase in risk (Shahinian, VB, et al., risk of colorectal cancer in men on long term androgen deprivation therapy for prostate cancer. J Natl Cancer Inst. 2010 Dec.1; 102(23): 1760-70)