Fiber, sex, and colorectal adenoma: results of a pooled analysis.
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.


METHODS
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).


CONCLUSIONS
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.
Arizona Cancer Center, University of Arizona, Tucson, AZ 85724-5024, USA. jacobse@u.arizona.edu
Elizabeth T
ET
Jacobs
Elaine
E
Lanza
David S
DS
Alberts
Chiu-Hsieh
CH
Hsu
Ruiyun
R
Jiang
Arthur
A
Schatzkin
Patricia A
PA
Thompson
María Elena
ME
Martínez
D000236:Adenoma / Q000178:diet therapy / Q000517:prevention & control*; D000368:Aged; D003111:Colonic Polyps / Q000517:prevention & control*; D015179:Colorectal Neoplasms / Q000178:diet therapy / Q000517:prevention & control*; D016001:Confidence Intervals; D004043:Dietary Fiber / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D016013:Likelihood Functions; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009364:Neoplasm Recurrence, Local / Q000517:prevention & control; D016017:Odds Ratio; D016032:Randomized Controlled Trials as Topic; D012737:Sex Factors