Hereditary nonpolyposis colorectal cancer (HNPCC) is the most common form of hereditary colorectal cancer. It is inherited as an autosomal dominant syndrome, as a result of defective mismatch repair (MMR) proteins. HNPCC accounts for 2-5% of all colorectal carcinomas.There are a number of different inherited conditions that have a significant risk of colon cancer.It is estimated that 1550% of colorectal cancers are familial. A single gene, a combination of genes, or a combination of genetic and environmental factors can cause familial colorectal cancer. Typically these families have one or two members with a history of colorectal cancer or precancerous polyps.Inherited colorectal cancers are associated with a genetic mutation in a cancer susceptibility gene. Everyone inherits one susceptibility gene from each of their parents, making a total of two working copies of each gene. If a mutation in one copy of a cancer susceptibility gene is passed from the parent to their child, the child is predisposed (or has the potential) to develop cancer.
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Last date updated on July, 2014