Abstract
Background
Efficacy of vitamin D supplementation may vary by dosing strategies and adiposity. To address such heterogeneity, we performed a meta-analysis of randomised controlled trials of vitamin D supplementation and total cancer outcomes.
Methods
PubMed and Embase were searched through January 2022. Summary relative risk (SRR) and 95% confidence interval (CI) were estimated using the DerSimonian–Laird random-effects model.
Results
For total cancer incidence (12 trials), the SRR for vitamin D supplementation vs. control group was 0.99 (95% CI, 0.94–1.03; P = 0.54; I2 = 0%). No significant association was observed regardless of whether the supplement was given daily or infrequently in a large-bolus. Yet, among trials testing daily supplementation, a significant inverse association was observed among normal-weight individuals (SRR, 0.76; 95% CI, 0.64–0.90; P = 0.001, I2 = 0%), but not among overweight or obese individuals (Pheterogeneity = 0.02). For total cancer mortality (six trials), the SRR was 0.92 (95% CI, 0.82–1.03; P = 0.17; I2 = 33%). A significant inverse association emerged (SRR, 0.87; 95% CI, 0.78–0.96; P = 0.007; I2 = 0%) among studies testing daily supplementations but not among studies that testing infrequent large-bolus supplementations (Pheterogeneity = 0.09).
Conclusions
For vitamin D supplementation, daily dosing, but not infrequent large-bolus dosing, reduced total cancer mortality. For total cancer incidence, bolus dosing did not reduce the risk and the benefits of daily dosing were limited to normal-weight individuals.
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Data availability
The data used for this meta-analysis were extracted from the articles, which were retrieved from the online databases PubMed and Embase.
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NK and QYC were supported by the BK21-plus education programme funding from the National Research Foundation of Korea. JEM is supported by R01 AT 011729 and R01 HL34594.
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NK collected, analysed and interpreted the data, and drafted the manuscript. QYC collected and analysed the data, and drafted the manuscript. DL, JEM and EG interpreted the date and drafted the manuscript.
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Keum, N., Chen, QY., Lee, D.H. et al. Vitamin D supplementation and total cancer incidence and mortality by daily vs. infrequent large-bolus dosing strategies: a meta-analysis of randomised controlled trials. Br J Cancer 127, 872–878 (2022). https://doi.org/10.1038/s41416-022-01850-2
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DOI: https://doi.org/10.1038/s41416-022-01850-2
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