Ninety percent of all colon cancers start as polyps. Therefore, the best way to prevent colon cancer is to look for precancerous polyps inside the colon and remove them before they progress to cancer. Colorectal cancer screening tests are designed to find precancerous polyps. Screening also detects cancers at an earlier stage when complete cure may be possible. Screening has been shown to prevent up to 70% of colon cancers.
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