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In a nested case-control study, Jiyoung Ahn, Ph.D., and Richard Hayes D.D.S., Ph.D., of the National Cancer Institute in Bethesda, Md., and colleagues compared the vitamin D concentrations in the blood of 749 men diagnosed with prostate cancer with that of 781 men without prostate cancer. All of the men were participants in the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial and were included in the regular screening arm. Vitamin D concentration was measured in a blood sample taken when the men enrolled in the study, and all prostate cancer cases included in the current analysis were diagnosed 1 to 8 years after the blood samples were taken.

No Association Found Between Vitamin D Concentration in Blood and Risk of Prostate Cancer