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特許 係属中 Colorectal cancer (also known as colon cancer, rectal cancer or bowel cancer) is when cancer develops in the colon or rectum (parts of the large intestine).[1] It is due to the abnormal growth of cells that have the ability to invade or spread to other parts of the body.[2] Symptoms may include blood in the stool, a change in bowel movements, weight loss, and feeling tired all the time.