18 This review also examined 13 studies of breast cancer, with 9 showing a favorable association of vitamin D markers or sunlight with decreased cancer risk, 1 showing benefit of borderline significance, and 3 without association. 18 They evaluated 7 studies of ovarian cancer, 5 of which showed higher mortality with lower vitamin D intake or lower sun exposure. 18 In addition to a possible anticarcinogenic effect of vitamin D, autoimmune diseases such as type 1 diabetes mellitus, multiple sclerosi
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