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Fiber, sex, and colorectal adenoma: results of a pooled analysis^1,2,3

¹ From the Arizona Cancer Center (ETJ, DSA, C-HH, RJ, and MEM), the Mel and Enid Zuckerman Arizona College of Public Health (ETJ, DSA, C-HH, and MEM), the College of Medicine (DSA), and the Department of Pathology (PAT), University of Arizona, Tucson, AZ, and the National Cancer Institute, Bethesda, MD (EL and AS)

Background: Evidence for an association between dietary fiber and colorectal neoplasia has been equivocal, and some data suggest that there may be sex differences in response to fiber.

Objective: We sought to determine whether fiber affects colorectal adenoma recurrence differently in men and women by combining the study populations of 2 large clinical intervention trials: the Wheat Bran Fiber Trial and the Polyp Prevention Trial.

Design: Data from 3209 participants combined from 2 trials were analyzed with logistic regression models to examine the effect of a dietary intervention on colorectal adenoma recurrence in the pooled population as a whole and by sex.

Results: The adjusted odds ratio for adenoma recurrence for those in the intervention group of either the Wheat Bran Fiber Trial or the Polyp Prevention Trial was 0.91 (95% CI: 0.78, 1.06). For men, the intervention was associated with statistically significantly reduced odds of recurrence with an odds ratio of 0.81 (95% CI: 0.67, 0.98); for women, no significant association was observed. Using a likelihood-ratio test, we found a statistically significant interaction between intervention group and sex (P = 0.03).

Conclusion: The results of the current analyses indicate that men may experience more benefit from dietary fiber than do women and may help to explain some of the discrepant results reported in the literature.

Key Words: Dietary fiber • sex • colorectal adenoma • fiber intervention • colorectal neoplasia • Wheat Bran Fiber Trial • Polyp Prevention Trial

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