A 10-year clinical research indicated that colonoscopies cut the incidence of colon cancer by just 20% and had no effect on mortality rates. The findings raise doubts about the widespread implementation of the technique as a screening tool.

A 10-year clinical research indicated that colonoscopies cut the incidence of colon cancer by just 20% and had no effect on mortality rates. The findings raise doubts about the widespread implementation of the technique as a screening tool.