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This information helps doctors recommend who should be screened for cancer, which screening tests should be used, and how often the tests should be done.

Colonoscopy is a procedure to look inside the rectum and colon for polyps, abnormal areas, or cancer.The digestive system is made up of the mouth, throat, esophagus, stomach, and the small and large intestines.The colon (large bowel) is the first part of the large intestine and is about 5 feet long.For some types of cancer, finding and treating the disease at an early stage may result in a better chance of recovery.Information about ongoing clinical trials is available from the NCI website.

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