Cancer
Cancer is caused by continuous uncontrolled abnormal division of cells which may invade and destroy other tissues. Many have a genetic component. Some, like familial polyposis coli (described in disorders of the large intestine in the digestive tract section) are inherited as an autosomal dominant disorder. In these conditions a single gene defect makes it highly likely that a sufferer will develop the cancer. In others there is a strong family history of associated cancers, often developing at an early age, particularly cancer affecting the colon and the breast. In such families where there is a cluster of cancers investigation, possibly involving DNA testing, may indicate those at increased risk of developing cancer, which may allow early detection and a better chance of cure.
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