Results of Repeat Sigmoidoscopy 3 Years After a Negative Examination | Cancer Screening, Prevention, Control | JAMA | JAMA Network
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Original Contribution
July 2, 2003

Results of Repeat Sigmoidoscopy 3 Years After a Negative Examination

Author Affiliations

Author Affiliations: Departments of Medicine and Epidemiology and the University of Pittsburgh Cancer Institute, University of Pittsburgh, Pittsburgh, Pa (Drs Schoen and Weissfeld); Division of Cancer Prevention, National Cancer Institute, Bethesda, Md (Drs Pinsky, Prorok, and Gohagan); Division of Gastrointestinal Medicine and Nutrition, M. D. Anderson Cancer Center, Houston, Tex (Dr Bresalier); and Division of Environmental and Occupational Health, University of Minnesota, Minneapolis (Dr Church).

JAMA. 2003;290(1):41-48. doi:10.1001/jama.290.1.41a
Abstract

Context  The necessary frequency of endoscopic colorectal cancer screening after a negative examination is uncertain.

Objective  To examine the yield of adenomas and cancer in the distal colon found by repeat flexible sigmoidoscopy (FSG) 3 years after a negative examination.

Design, Setting, and Participants  Participants were drawn from the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial (PLCO), a randomized, controlled community-based study of cancer screening. The mean (SD) age was 65.7 (4.0) years at study entry (1993-1995) and 61.6% were men. Individuals underwent screening FSG at baseline and at 3 years as part of the protocol and were referred to their personal physicians for further evaluation of screen-detected abnormalities. Results from subsequent diagnostic evaluations were tracked in a standardized fashion. Of 11 583 eligible for repeat screening FSG 3 years after an initial negative examination, 9317 (80.4%) returned.

Main Outcome Measures  Polyp or mass detection in distal colon at year 3 repeat FSG; incidence of adenoma or cancer in distal colon at year 3 examination; determination of reason for detection (increased depth of insertion or improved preparation at the year 3 examination or detection in a previously examined area).

Results  A total of 1292 returning participants (13.9%) had a polyp or mass detected by FSG 3 years after the initial examination. In the distal colon, 3.1% (292/9317) were found to have an adenoma or cancer. The incidence of advanced adenoma (n = 72) or cancer (n = 6) in the distal colon was 78 (0.8%) of 9317. Of individuals with advanced distal adenomas detected at the year 3 examination, 80.6% (58/72) had lesions found in a portion of the colon that had been adequately examined at the initial sigmoidoscopy.

Conclusions  Repeat FSG 3 years after a negative examination will detect advanced adenomas and distal colon cancer. Although the overall percentage with detected abnormalities is modest, these data raise concern about the impact of a prolonged screening interval after a negative examination.

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