People who undergo endoscopic screening are less likely to develop colorectal cancer than those who aren't checked, according to new data. Findings derived from the Nurses' Health Study and Health Professionals Follow-up Study suggest 40% of the colorectal cancers that occurred during the study would have been avoided if everyone had been screened. A second study found fecal occult blood tests can also reduce mortality from colorectal cancer. The results appear in the New England Journal of Medicine.

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