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Schwaz says "Because the majority of Colorectal cancers are thought to arise from Adenomatous polyps, preventive measures focus upon identification and removal of these premalignant lesions. In addition, many cancers are asymptomatic and screening may detect these tumors at an early and curable stage American cancer society Recommendations for early detection of cancer in Average - Risk, Asymptomatic individuals Cancer site - Colorectal Population to be screened - Men and women aged >= 50 years Test or procedure - Fecal occult blood test(FOBT( or fecal immunochemical test (FIT( Flexible sigmoidoscopy FOBT and Flexible sigmoidoscopy Double - Contrast barium enema (DCBE( Colonoscopy Frequency Annual, staing at age 50 EEvery 5 years, staing at age 50 Annual FOBT, (or FIT) and flexible sigmoidoscopy every 5 years, staing at age 50 DCBE every 5 years, staing at age 50 Colonoscopy every 10 years, staing at age 50 Ref: Harrison's 19th edition Pgno : 481 Schwaz 10th edition Pgno : 298