Question: how hereditary is colon cancer?
Answer: Approximately 5 to 10 percent of colon cancer is hereditary. The major hereditary colon cancer syndromes are Lynch syndrome (previously known as Hereditary Non-Polyposis Colorectal Cancer or HNPCC) and Familial Adenomatous Polyposis (FAP). Other genes have also been implicated in hereditary colon cancer risk.