Vitamin D supplementation and breast cancer prevention: a systematic review and meta-analysis of randomized clinical trials.
PLoS One. 2013 Jul 22;8(7):e69269. doi: 10.1371/journal.pone.0069269. Print 2013.
Sperati F1, Vici P, Maugeri-Saccà M, Stranges S, Santesso N, Mariani L, Giordano A, Sergi D, Pizzuti L, Di Lauro L, Montella M, Crispo A, Mottolese M, Barba M.
In recent years, the scientific evidence linking vitamin D status or supplementation to breast cancer has grown notably. To investigate the role of vitamin D supplementation on breast cancer incidence, we conducted a systematic review and meta-analysis of randomized controlled trials comparing vitamin D with placebo or no treatment. We used OVID to search MEDLINE (R), EMBASE and CENTRAL until April 2012. We screened the reference lists of included studies and used the "Related Article" feature in PubMed to identify additional articles. No language restrictions were applied. Two reviewers independently extracted data on methodological quality, participants, intervention, comparison and outcomes. Risk Ratios and 95% Confident Intervals for breast cancer were pooled using a random-effects model. Heterogeneity was assessed using the I(2) test. In sensitivity analysis, we assessed the impact of vitamin D dosage and mode of administration on treatment effects. Only two randomized controlled trials fulfilled the pre-set inclusion criteria. The pooled analysis included 5372 postmenopausal women.
Overall, Risk Ratios and 95% Confident Intervals were 1.11 and 0.74-1.68. We found no evidence of heterogeneity. Neither vitamin D dosage nor mode of administration significantly affected breast cancer risk.
However, treatment efficacy was somewhat greater when vitamin D was administered at the highest dosage and in combination with calcium (Risk Ratio 0.58, 95% Confident Interval 0.23-1.47 and Risk Ratio 0.93, 95% Confident Interval 0.54-1.60, respectively).
In conclusions, vitamin D use seems not to be associated with a reduced risk of breast cancer development in postmenopausal women. However, the available evidence is still limited and inadequate to draw firm conclusions.
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- Overview Breast Cancer and Vitamin D
- Breast Cancer survival 2X more likely if vitamin D sufficient – meta-analysis May 2013
- If have breast cancer, should increase vitamin D to more than 30 ng – Jan 2012
- 3.2 percent less Breast Cancer for 2.4 ng more vitamin D – meta-analysis June 2013
- Breast Cancer post menopause down 12 percent for every 5 ng of vitamin D – meta-analysis May 2013