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No association found between vitamin D concentration in blood and risk of prostate cancer
Date:5/27/2008

High vitamin D concentration in the blood is not associated with a reduced risk of prostate cancer, researchers report in an article published online May 27 in the Journal of the National Cancer Institute.

Laboratory studies suggested that high doses of vitamin D may reduce the risk of prostate cancer, but epidemiological studies that have examined the relationship have reported inconsistent results.

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.

The researchers found that there was no statistically significant difference in the risk of prostate cancer with increasing vitamin D concentration. The researchers did see some evidence of an increased risk of aggressive disease associated with higher concentration of vitamin D, but the trend was not statistically significant and the association did not show a linear dose-dependence.

Results from this large prospective study of men who underwent standardized prostate cancer screening in the context of a screening trial do not support the hypothesis that higher serum vitamin D status is associated with decreased risk of prostate cancer, the authors write. The study showed no association of vitamin D with nonaggressive disease; however, it raises the possibility that higher vitamin D level may be associated with increased risks for aggressive disease, although a clear mo
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Contact: Liz Savage
jncimedia@oxfordjournals.org
301-841-1287
Journal of the National Cancer Institute
Source:Eurekalert

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