Cancer and Vitamin D supplementation:A systematic review and meta-analysis

Goulão, Beatriz, Stewart, Fiona, Ford, John A., Maclennan, Graeme and Avenell, Alison (2018) Cancer and Vitamin D supplementation:A systematic review and meta-analysis. American Journal of Clinical Nutrition, 107 (4). pp. 652-663. ISSN 0002-9165

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Abstract

Background: Low 25-hydroxyvitamin D status has been associated with a higher risk of cancer in epidemiologic studies. Objective The aim of this study was to undertake a systematic review and meta-analysis of randomized clinical trials (RCTs) investigating the effect of vitamin D supplementation alone on cancer incidence and mortality. Design: A systematic review was undertaken. MEDLINE, Embase, CENTRAL, conference abstracts, and clinical trial registries were searched (last search March 2017) for RCTs investigating vitamin D supplementation alone. RCTs with ≥12 mo of follow-up and in participants with a mean or median age ≥60 y were eligible. During-study events were used as the main analysis, but after-study events were included in a secondary analysis. Subgroup analyses concerning different forms of vitamin D supplementation, 25-hydroxyvitamin D status at baseline, vitamin D dose, and exclusion of open-label trials were undertaken. Results: Thirty studies in 18,808 participants were included in the systematic review, with a median follow-up ranging from 1 to 6.2 y. The results of the meta-analysis for during-study events showed no evidence of an effect of vitamin D supplementation for cancer incidence (RR: 1.03; 95% CI: 0.91, 1.15) and cancer-related deaths (RR: 0.85; 95% CI: 0.70, 1.04). Including after-study events, the RRs were 1.02 (95% CI: 0.92, 1.13) and 0.85 (95% CI: 0.72, 1.00), respectively. These results did not appear to be affected by baseline 25-hydroxyvitamin D status, vitamin D dose, or the exclusion of open-label trials. Conclusion: We did not find evidence to suggest that vitamin D supplementation alone reduces the incidence of cancer or cancer mortality, even after including long-term follow-up results.

Item Type: Article
Uncontrolled Keywords: cancer,meta-analysis,mortality,systematic review,vitamin d,medicine (miscellaneous),nutrition and dietetics ,/dk/atira/pure/subjectarea/asjc/2700/2701
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
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Depositing User: LivePure Connector
Date Deposited: 15 Mar 2019 10:30
Last Modified: 18 Mar 2020 02:46
URI: https://ueaeprints.uea.ac.uk/id/eprint/70238
DOI: 10.1093/ajcn/nqx047

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