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Dairy products and ovarian cancer: A pooled analysis of 12 cohort studies

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Author: Genkinger, J.M. · Hunter, D.J. · Spiegelman, D. · Anderson, K.E. · Arslan, A. · Beeson, W.L. · Buring, J.E. · Fraser, G.E. · Freudenheim, J.L. · Goldbohm, R.A. · Hankinson, S.E. · Jacobs Jr., D.R. · Koushik, A. · Lacey Jr., J.V. · Larsson, S.C. · Leitzmann, M. · McCullough, M.L. · Miller, A.B. · Rodriguez, C. · Rohan, T.E. · Scheuten, L.J. · Shore, R. · Smit, E. · Wolk, A. · Zhang, S.M. · Smith-Warner, S.A.
Type:article
Date:2006
Institution: TNO Kwaliteit van Leven
Source:Cancer Epidemiology Biomarkers and Prevention, 2, 15, 364-372
Identifier: 239102
doi: doi:10.1158/1055-9965.EPI-05-0484
Keywords: Health · Food and Chemical Risk Analysis · calcium · lactose · yoghurt · article · cancer epidemiology · cancer risk · case control study · cheese · clinical trial · cohort analysis · confidence interval · dairy product · disease association · endometrioid carcinoma · female · food intake · high risk patient · human · ice cream · major clinical study · meta analysis · milk · mucinous carcinoma · ovary cancer · practice guideline · priority journal · prospective study · statistical significance · systematic review · Calcium, Dietary · Cohort Studies · Dairy Products · Diet Surveys · Female · Humans · Lactose · Multivariate Analysis · Outcome Assessment (Health Care) · Ovarian Neoplasms · Proportional Hazards Models · Vitamin D

Abstract

Background: Dairy foods and their constituents (lactose and calcium) have been hypothesized to promote ovarian carcinogenesis. Although case-control studies have reported conflicting results for dairy foods and lactose, several cohort studies have shown positive associations between skim milk, lactose, and ovarian cancer. Methods: A pooled analysis of the primary data from 12 prospective cohort studies was conducted. The study population consisted of 553,217 women among whom 2,132 epithelial ovarian cases were identified. Study-specific relative risks and 95% confidence intervals were calculated by Cox proportional hazards models and then pooled by a random-effects model. Results: No statistically significant associations were observed between intakes of milk, cheese, yogurt, ice cream, and dietary and total calcium intake and risk of ovarian cancer. Higher lactose intakes comparing ≥30 versus <10 g/d were associated with a statistically significant higher risk of ovarian cancer, although the trend was not statistically significant (pooled multivariate relative risk, 1.19; 95% confidence interval, 1.01-1.40; P trend = 0.19). Associations for endometrioid, mucinous, and serous ovarian cancer were similar to the overall findings. Discussion: Overall, no associations were observed for intakes of specific dairy foods or calcium and ovarian cancer risk. A modest elevation in the risk of ovarian cancer was seen for lactose intake at the level that was equivalent to three or more servings of milk per day. Because a new dietary guideline recommends two to three servings of dairy products per day, the relation between dairy product consumption and ovarian cancer risk at these consumption levels deserves further examination. Copyright © 2006 American Association for Cancer Research.