"Colorectal Cancer Screening for Persons at Average Risk" byAnderson et al. [J Natl Cancer Inst 2002;94:112633 (Issue15)]. On page 1127, the word "not" should be deleted from thelast sentence of the first paragraph in the section entitled"Flexible sigmoidoscopy (FS)." The sentence should read "Comparedwith the control group, the subjects who were offered initialFS endoscopic screening followed by colonoscopy for positiveresults demonstrated an 80% reduction in CRC incidence (relativerisk = 0.2, 95% confidence interval = 0.03 to 0.95; P = .02)(39)." The authors regret the error.