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Selenium, Apoptosis, and Colorectal Adenomas

Departments of ¹ Epidemiology, ² Nutrition, and ³ Biostatistics and ⁴ Department of Medicine and Center for Gastrointestinal Biology and Disease, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina and ⁵ Department of Global Epidemiology, Amgen, Inc., Thousand Oaks, California

Requests for reprints: Alexandra Connelly-Frost, R. Stuart Dickson Institute for Health Studies, 720 East Morehead Street, Charlotte, NC 28232. Phone: 704-355-4159; Fax: 704-355-1880. E-mail: aconnell{at}email.unc.edu

Background: Selenium is an essential trace element found in cereals, wheat, dairy products, meat, and fish. This micronutrient may prevent carcinogenesis through several biochemical pathways; one suggested pathway is enhanced apoptosis.

Objectives: The relation between selenium and colorectal adenomas was evaluated because the colorectal adenoma is the established precursor lesion of most colorectal cancers. Apoptosis was a pathway of interest because decreased apoptosis has been associated with an increased prevalence of adenomas. Our objectives were as follows: to investigate the association between (a) selenium and colorectal adenomas and (b) selenium and apoptosis.

Methods: The study population was assembled for the Diet and Health Study III (n = 803), a cross-sectional study conducted at the University of North Carolina Hospital (Chapel Hill, NC). There were 451 participants in the analysis of selenium and adenoma prevalence and 351 participants in the analysis of selenium and apoptosis. Selenium was measured from serum collected at the time of colonoscopy. Apoptosis was measured in biopsies from normal rectal epithelium obtained during the colonoscopy procedure.

Results: Participants in the highest fifth of serum selenium were less likely to have adenomas in comparison with those in the lowest fifth (prevalence ratio, 0.6; 95% confidence interval, 0.4-1.1). Selenium and apoptosis (>2.76 cells per crypt) were not strongly related, but results collectively suggested a roughly inverse association.

Conclusions: High selenium was associated with a reduced prevalence of colorectal adenomas. Apoptosis, however, did not seem to be the mechanism by which selenium was related to adenoma prevalence in our data. (Cancer Epidemiol Biomarkers Prev 2006;15(3):486–93)

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