Colon cancer is a leading cause of cancer death in the US, second only to lung cancer.  Fortunately, there are effective tests that can diagnose colon cancer early, or even prevent colon cancer while it is still a pre-cancerous polyp.  Given that this is one of the few cancers for which effective screening exists, I have been very enthusiastic about recommending colon cancer screening to all my patients over 50. The options for screening thus far have been colonoscopy, sigmoidoscopy, fecal occu...