08 November 2015 : Meta-Analysis
Association of Vitamin E Intake with Reduced Risk of Kidney Cancer: A Meta-Analysis of Observational StudiesChongxing ShenABCDEF, Ying HuangCE, Shanhong YiBE, Zhenqiang FangBEF, Longkun LiACDFG
Med Sci Monit 2015; 21:3420-3426
BACKGROUND: Several observational studies suggested that vitamin E intake is related to the risk of kidney cancer; however, the results of published studies are inconsistent.
MATERIAL AND METHODS: A meta-analysis was performed to assess the relationship between vitamin E intake and the risk of kidney cancer by searching PubMed and Medline through August 2015. We computed pooled relative risks (RR) and 95%CI of kidney cancer for the highest versus lowest level of vitamin E intake.
RESULTS: A total of 13 observational studies (7 case-control and 6 cohort) were included. The pooled RR (95%CI) of kidney cancer for the highest vs. the lowest level of vitamin E intake was 0.81 (0.69–0.94). In subgroup-analysis, this study found an inverse relationship between vitamin E intake and kidney cancer risk, which was not significantly modified by study design, study population, or sex distribution except in the cohort studies.
CONCLUSIONS: Results of the present study suggest an inverse relationship between vitamin E intake and kidney cancer risk. However, additional well designed cohort studies and randomized controlled trials that focus on the relationship between vitamin E intake and kidney cancer risk are needed.
Keywords: Diet, Kidney Neoplasms - prevention & control, Observational Studies as Topic, Randomized Controlled Trials as Topic, Risk Factors, Sex Factors, Vitamin E - metabolism
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