According to new research, colonoscopies may not be as effective at preventing and reducing the risk of colorectal cancer as once believed.

A landmark study suggests the benefits of colonoscopies for cancer screening may be overestimated.

The study is the first of its kind, comparing head-to-head to no cancer screening in a randomized trial, found that colonoscopies reduced people’s risk of developing cancer, but it was far less than what had previously been observed in other studies.

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