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Diagnosis and Treatment |

Screening for Colorectal Cancer

David M. Eddy, MD, PhD
[+] Article, Author, and Disclosure Information

This paper concludes the series on common screening tests. The series will be published as a book, "Common Screening Tests" by the American College of Physicians. The exact publication date will be announced in a forthcoming issue.

Grant Support: Partial support by the Blue Cross and Blue Shield Association and the Charles A. Dana Foundation.

Requests for Reprints: David M. Eddy, MD, PhD, Skyline Route, Box 32, Jackson, WY 83001.

Current Author Address: Dr. Eddy: Skyline Route, Box 32, Jackson, WY 83001.

©1990 American College of PhysiciansAmerican College of Physicians

Ann Intern Med. 1990;113(5):373-384. doi:10.7326/0003-4819-113-5-373
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Considerable indirect evidence, based on the natural history of colorectal cancer and the ability of tests to detect adenomas and invasive cancers, suggests that screening for colorectal cancer reduces mortality. Without screening, a 50-year-old person at average risk has approximately a 530-in-10 000 chance of developing invasive colorectal cancer in the rest of his or her life and approximately a 250-in-10 000 chance of dying from it. Analysis of indirect evidence with a mathematic model indicates that screening persons for 25 years, from the age of 50 to the age of 75 years should reduce the chance of developing or dying from colorectal cancer by 10% to 75%, depending on which screening tests are used and how often screening is done. Screening for colorectal cancer is optional. A possible recommendation is that annual fecal occult blood tests and 65-cm flexible sigmoidoscopy every 3 to 5 years be done for average-risk men and women who are between 50 and 75 years of age. In addition to having annual fecal occult blood tests, persons with first-degree relatives with colorectal cancer can be offered barium enemas instead of sigmoidoscopies every 3 to 5 years.





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