NEW YORK (Reuters Health) - Sufficient levels of vitamin D might help protect Hispanic and potentially Black women from developing breast cancer, new research suggests.
"Although Black/African American women and Hispanic/Latina women have lower circulating vitamin D levels than non-Hispanic white women, few studies have examined the association between vitamin D and breast cancer within these racial/ethnic groups," the study team notes in the journal Cancer.
Dr. Katie O'Brien and colleagues with the National Institute of Environmental Health Sciences measured 25-hydroxyvitamin D (25(OH)D) and 24,25-dihydroxyvitamin D (24,25(OH)2D) levels in blood samples from 290 Black/African American women and 125 non-Black Hispanic/Latina women who developed breast cancer, and 1,084 Black/African American women and 461 Hispanic/Latina women who did not develop breast cancer.
Over an average follow-up of 9.2 years, women with circulating 25(OH)D levels above the clinical cut point for deficiency (20.0 ng/mL) had a 21% lower breast cancer rate than women with concentrations below this cut point, although the result fell short of statistical significance (hazard ratio, 0.79; 95% CI, 0.61 to 1.02).
"Although Black/African American women and Hispanic/Latina women have lower circulating vitamin D levels than non-Hispanic white women, few studies have examined the association between vitamin D and breast cancer within these racial/ethnic groups," the study team notes in the journal Cancer.
Dr. Katie O'Brien and colleagues with the National Institute of Environmental Health Sciences measured 25-hydroxyvitamin D (25(OH)D) and 24,25-dihydroxyvitamin D (24,25(OH)2D) levels in blood samples from 290 Black/African American women and 125 non-Black Hispanic/Latina women who developed breast cancer, and 1,084 Black/African American women and 461 Hispanic/Latina women who did not develop breast cancer.
Over an average follow-up of 9.2 years, women with circulating 25(OH)D levels above the clinical cut point for deficiency (20.0 ng/mL) had a 21% lower breast cancer rate than women with concentrations below this cut point, although the result fell short of statistical significance (hazard ratio, 0.79; 95% CI, 0.61 to 1.02).
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