Post-Diagnosis Vitamin D Supplement Use and Survival among Cancer Patients: A Meta-Analysis.

There was a marginally significant inverse association in relation to breast cancer (RR, 0.88; 95% CI, 0.77–1.001; p = 0.05; I 2 = 0%; five cohort studies), but not with other cancer types ( Figure 3 B). 3.3.

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