http://shc.is/CCWICC -- Doctors don’t often talk with much certainty about preventing cancer. Colon cancer, the third most common type of cancer, is a different story. In this video, Stanford’s top colon care specialists explain what you can do to prevent colon cancer, describe who is at greatest risk and talk about the new tests (including those that target the genetics of a colon tumor) and chemotherapies that have changed the long-term prognosis even for people with advanced colon cancer.