Background and Methods The clinical significance of a distalcolorectal polyp is uncertain. We determined the risk of advancedproximal neoplasia, defined as a polyp with villous features,a polyp with high-grade dysplasia, or cancer, among personswith distal hyperplastic or neoplastic polyps as compared withthe risk among persons with no distal polyps. We analyzed datafrom 1994 consecutive asymptomatic adults (age, 50 years orolder) who underwent colonoscopic screening for the first timebetween September 1995 and December 1998 as part of a programsponsored by an employer. The location and histologic featuresof all polyps were recorded. Colonoscopy to the level of thececum was completed in 97.0 percent of the patients.
Results Sixty-one patients (3.1 percent) had advanced lesionsin the distal colon, including 5 with cancer, and 50 (2.5 percent)had advanced proximal lesions, including 7 with cancer. Twenty-threepatients with advanced proximal neoplasms (46 percent) had nodistal polyps. The prevalence of advanced proximal neoplasiaamong patients with no distal polyps was 1.5 percent (23 casesamong 1564 persons; 95 percent confidence interval, 0.9 to 2.1percent). Among patients with distal hyperplastic polyps, thosewith distal tubular adenomas, and those with advanced distalpolyps, the prevalence of advanced proximal neoplasia was 4.0percent (8 cases among 201 patients), 7.1 percent (12 casesamong 168 patients), and 11.5 percent (7 cases among 61 patients),respectively. The relative risk of advanced proximal neoplasia,adjusted for age and sex, was 2.6 for patients with distal hyperplasticpolyps, 4.0 for those with distal tubular adenomas, and 6.7for those with advanced distal polyps, as compared with patientswho had no distal polyps. Older age and male sex were associatedwith an increased risk of advanced proximal neoplasia (relativerisk, 1.3 for every five years of age and 3.3 for male sex).
Conclusions Asymptomatic persons 50 years of age or older whohave polyps in the distal colon are more likely to have advancedproximal neoplasia than are persons without distal polyps. However,if colonoscopic screening is performed only in persons withdistal polyps, about half the cases of advanced proximal neoplasiawill not be detected.
Source Information
From the Departments of Medicine, Indiana University Medical Center and Roudebush Veterans Affairs Medical Center (T.F.I., C.Y.L.); the Indianapolis Gastroenterology Research Foundation (D.R.W., J.D.R.); and Eli Lilly (G.N.L.) all in Indianapolis; and the Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill (D.F.R.).
Address reprint requests to Dr. Imperiale at Indiana University Medical Center, Division of Gastroenterology, 975 W. Walnut St., IB-424, Indianapolis, IN 46202-5121.
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