Annals of internal medicine
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Multicenter Study
Screening colonoscopy and risk for incident late-stage colorectal cancer diagnosis in average-risk adults: a nested case-control study.
The effectiveness of screening colonoscopy in average-risk adults is uncertain, particularly for right colon cancer. ⋯ Screening with colonoscopy in average-risk persons was associated with reduced risk for diagnosis of incident late-stage CRC, including right-sided colon cancer. For sigmoidoscopy, this association was seen for left CRC, but the association for right colon late-stage cancer was not statistically significant.