Hereditary nonpolyposis colon cancer (HNPCC), also known as Lynch syndrome, is a type of inherited cancer of the large intestine. People who have HNPCC are at increased risk for developing small growths of excess tissue (polyps) in the large intestine early in life, making it more likely the growths will become cancerous.
A person who has HNPCC may develop colon cancer at an early age (before age 50).
These things are common in families with HNPCC:
HNPCC-related cancers include cancers of the colon, endometrium, stomach, ovary, pancreas, upper urinary tract, brain, small intestine, and skin.
A genetic test can tell if a person carries the gene for HNPCC.
Experts recommend that people with HNPCC have a colonoscopy every 1 to 2 years starting at age 20 to 25, or 10 years younger than the age at which the youngest family member who has colorectal cancer was diagnosed, whichever age is younger.