The American Cancer Society encourages African American men and women 50 and older to make testing for colorectal cancer a priority. Colorectal cancer (commonly referred to as colon cancer) is the third most common cancer among African American men and women. Colon cancer can be prevented through screening, which allows doctors to find and remove polyps in the colon before they turn cancerous. African Americans should begin testing for colon cancer at age 50, but those with a family history are at higher risk and should start testing sooner.