Reproductive and menstrual factors and colorectal cancer incidence in the Women’s Health Initiative Observational Study

Background: Reproductive and menstrual factors have been evaluated as surrogates for long-term hormonal exposures in several prospective studies of colorectal cancer, yet findings have been conflicting. Methods: The relation of reproductive and menstrual factors (self-reported via a reproductive history questionnaire) with incident colorectal cancer was investigated among women enrolled in the Women's Health Initiative Observational Study (WHI-OS), a longitudinal cohort of 93 676 postmenopausal women (aged 50-79 years at enrolment) in which 1149 incident cases of colorectal cancer occurred over a median follow-up of 11.9 years. Multivariable Cox proportional hazards models that included established colorectal cancer risk factors were constructed to examine the association of colorectal cancer incidence with reproductive and menstrual factors. Results: Having had two children (vs nulliparous: hazard ratio (HR) = 0.80, 95% confidence interval (CD: 0.64-0.99) was inversely associated with colorectal cancer risk. Compared with never users, ever use of oral contraceptives was associated with lower colorectal cancer risk (HR = 0.74, 95% CI: 0.63-0.86); however, no relationship was observed for duration of oral contraceptives use (4 years vs 1 year: HR = 0.94, 95% CI: 0.67-1.32). None of the remaining reproductive and menstrual factors was associated with colorectal cancer incidence. Conclusions: Parity and prior use of oral contraceptives were associated with lower colorectal cancer risk in this cohort of postmenopausal women.National Institutes of Health, National Heart Lung and Blood Institute [HHSN268200900010C]; National Heart, Lung, and Blood Institute, National Institutes of Health, US Department of Health and Human Services [HHSN268201100046C, HHSN268201600003C, HHSN268201600002C, HHSN268201600004C, HHSN268201600001C, HHSN271201100004C]12 month embargo; Published online 29 November 2016This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu