Colorectal cancer is cancer that is found in the colon (large intestine) or the rectum. Sometimes it is called colon cancer. It is the second leading cancer killer in the United States, but it doesn’t have to be. If everyone aged 45 years or older had regular screening tests, at least 60% of deaths from this cancer could be avoided. So if you are 45 or older, talk to your doctor about being screened.