Hereitary nonpolyposis colorectal cancer (HNPCC), also known as Lynch syndrome, is characterised by a risk of colorectal cancer and other cancers of the endometrium, ovary, stomach, small intestine, hepatobiliary tract, upper urinary tract, brain, and skin. HNPCC is subdivided into Lynch Syndrome I (familial colon cancer) and Lynch Syndrome II (other cancer of the gastrointestinal system or the reproductive system). The increased risk for these cancers is due to inherited mutations that degrade the self-repair capability of DNA.