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Comment & Response
June 8, 2017

Vitamin D and Breast Cancer SurvivalThe Good and the Bad

Author Affiliations
  • 1Department of Medicine, University Hospital, Amiens, France
JAMA Oncol. Published online June 8, 2017. doi:10.1001/jamaoncol.2016.6792

To the Editor The report by Yao et al1 of associations of higher vitamin D levels with lower risk of breast cancer morbidity and mortality warrants comment.

First, Kaplan-Meier survival curves by tertiles of serum 25-hydroxyvitamin D (25OHD) levels for the 4 outcomes (1) only begin to be slightly different after day 1500 or 2000 and (2) are not consistent for the 3 tertiles (eg, recurrence-free survival vs breast cancer–specific survival).

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