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.2015 Sep;26(9):1315-27.
doi: 10.1007/s10552-015-0626-0. Epub 2015 Jul 14.

Intake of vitamins A, C, and E and folate and the risk of ovarian cancer in a pooled analysis of 10 cohort studies

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Intake of vitamins A, C, and E and folate and the risk of ovarian cancer in a pooled analysis of 10 cohort studies

Anita Koushik et al. Cancer Causes Control.2015 Sep.

Abstract

Purpose: Vitamins A, C, and E and folate have anticarcinogenic properties and thus might protect against cancer. Few known modifiable risk factors for ovarian cancer exist. We examined the associations between dietary and total (food and supplemental) vitamin intake and the risk of invasive epithelial ovarian cancer.

Methods: The primary data from 10 prospective cohort studies in North America and Europe were analyzed. Vitamin intakes were estimated from validated food frequency questionnaires in each study. Study-specific relative risks (RRs) were estimated using the Cox proportional hazards model and then combined using a random-effects model.

Results: Among 501,857 women, 1,973 cases of ovarian cancer occurred over a median follow-up period of 7-16 years across studies. Dietary and total intakes of each vitamin were not significantly associated with ovarian cancer risk. The pooled multivariate RRs [95% confidence intervals (CIs)] for incremental increases in total intake of each vitamin were 1.02 (0.97-1.07) for vitamin A (increment: 1,300 mcg/day), 1.01 (0.99-1.04) for vitamin C (400 mg/day), 1.02 (0.97-1.06) for vitamin E (130 mg/day), and 1.01 (0.96-1.07) for folate (250 mcg/day). Multivitamin use (vs. nonuse) was not associated with ovarian cancer risk (pooled multivariate RR = 1.00, 95% CI 0.89-1.12). Associations did not vary substantially by study, or by subgroups of the population. Greater vitamin intakes were associated with modestly higher risks of endometrioid tumors (n = 156 cases), but not with other histological types.

Conclusion: These results suggest that consumption of vitamins A, C, and E and folate during adulthood does not play a major role in ovarian cancer risk.

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Figure 1
Figure 1
Study-specific and pooled multivariate RRs and 95% CI of ovarian cancer comparing multivitamin users to nonusers1,2 1 BCDDP=Breast Cancer Detection Demonstration Project Follow-up Cohort, CPS II=Cancer Prevention Study II Nutrition Cohort, IWHS=Iowa Women's Health Study, NLCS =Netherland Cohort Study, NYSC = New York State Cohort, NYUWHS=New York University Women's Health Study, NHSa=Nurses’ Health Study (a), NHSb=Nurses’ Health Study (b), NHS II=Nurses’ Health Study II 2 The black squares and horizontal lines correspond to the study-specific multivariate RR and 95% CI, respectively. The area of the black square reflects the study-specific weight (inverse of the variance). The diamond represents the pooled multivariate RR and 95% CI. The solid vertical line indicates a RR of 1.0. The Canadian National Breast Screening Study and Swedish Mammography Cohort were not included in this analysis because data on multivitamin use was not available in these studies at baseline.
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