© 2003 by Oxford University Press
Journal of the National Cancer Institute, Vol. 95, No. 2, 154-159,
January 15, 2003
© 2003 Oxford University Press
ARTICLE |
Association Between Hemochromatosis (HFE) Gene Mutation Carrier Status and the Risk of Colon Cancer
Affiliations of authors: N. J. Shaheen, T. Keku, L. B. Lawrence, R. S. Sandler (Center for Gastrointestinal Biology and Disease, and Division of Digestive Diseases and Nutrition), L. M. Silverman, E. M. Rohlfs (Department of Laboratory Medicine and Pathology), C. F. Martin, J. Galanko (Center for Gastrointestinal Biology and Disease), University of North Carolina, Chapel Hill.
Correspondence to: Nicholas J. Shaheen, M.D., M.P.H., University of North Carolina, CB#7080, 724 Burnett-Womack Bldg., Chapel Hill, NC 27599–7080 (e-mail:
nshaheen{at}med.unc.edu).
Background: Iron is a pro-oxidant that may promote carcinogenesis. Mutations in the hemochromatosis (HFE) gene are associated with increased total body iron stores in some individuals. We assessed the risk of colon cancer among individuals with and without HFE gene mutations. Methods: We performed a population-based, case–control study in North Carolina. Case patients with colon cancer and control subjects provided information on multiple environmental exposures, including total iron intake and nonsteroidal anti-inflammatory drug (NSAID) use. They also provided a venous blood sample, from which DNA was extracted, amplified, and subjected to diagnostic restriction enzyme mapping to detect two major HFE gene mutations, C282Y and H63D. Data were analyzed with Fisher’s exact test and logistic regression. All statistical tests were two-sided. Results: Thirteen hundred and eight subjects participated (475 case patients, 833 control subjects). The allele frequencies of the H63D and C282Y mutations were greater among case patients (0.11 and 0.046, respectively) than among control subjects (0.09 and 0.044, respectively; P = .14 and P = .85, respectively). When we controlled for age, race, sex, red meat consumption, NSAID use, and total iron intake, subjects with any HFE gene mutation were more likely to have colon cancer than subjects with no HFE gene mutations (adjusted odds ratio [OR] = 1.40, 95% confidence interval [CI] = 1.07 to 1.87). The magnitude of the effect was similar for both the H63D (adjusted OR = 1.44, 95% CI = 1.04 to 1.98) and C282Y mutations (adjusted OR = 1.39, 95% CI = 0.88 to 2.19). The risk of colon cancer associated with an HFE gene mutation was similar for those who did and did not have a family history of colon cancer. Among those with HFE mutations, cancer risk increased with increasing age and total iron intake. Conclusions: HFE gene mutations are associated with an increased risk of colon cancer. Cancer risk is greatest in mutation carriers who are older or consume high quantities of iron.
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