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A randomized controlled trial of calcium plus vitamin D supplementation and risk of benign proliferative breast disease.

Abstract：

:Experimental evidence provides strong support for anti-carcinogenic effects of calcium and vitamin D with respect to breast cancer. Observational epidemiologic data also provide some support for inverse associations with risk. We tested the effect of calcium plus vitamin D supplementation on risk of benign proliferative breast disease, a condition which is associated with increased risk of breast cancer. We used the Women's Health Initiative randomized controlled trial. The 36,282 participants were randomized either to 500 mg of elemental calcium as calcium carbonate plus 200 IU of vitamin D(3) (GlaxoSmithKline) twice daily (n = 18,176) or to placebo (n = 18,106). Regular mammograms and clinical breast exams were performed. We identified women who had had a biopsy for benign breast disease and subjected histologic sections from the biopsies to standardized review. After an average follow-up period of 6.8 years, 915 incident cases of benign proliferative breast disease had been ascertained, with 450 in the intervention group and 465 in the placebo group. Calcium plus vitamin D supplementation was not associated with altered risk of benign proliferative breast disease overall (hazard ratio = 0.99, 95% confidence interval = 0.86-1.13), or by histologic subtype. Risk varied significantly by levels of age at baseline, but not by levels of other variables. Daily use of 1,000 mg of elemental calcium as calcium carbonate plus 400 IU of vitamin D(3) for almost 7 years by postmenopausal women did not alter the overall risk of benign proliferative breast disease.

journal_name

Breast Cancer Res Treat

journal_title

Breast cancer research and treatment

authors

Rohan TE,Negassa A,Chlebowski RT,Ceria-Ulep CD,Cochrane BB,Lane DS,Ginsberg M,Wassertheil-Smoller S,Page DL

doi

10.1007/s10549-008-0213-0

subject

Has Abstract

pub_date

2009-07-01 00:00:00

pages

339-50

issue

2

eissn

0167-6806

issn

1573-7217

journal_volume

116

pub_type

杂志文章,多中心研究,随机对照试验

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