Just "D" Facts about Vitamin D

Benefits of Moderate UV Sunshine Exposure

Ultraviolet and/or Sunlight Exposure During Teen / Adulthood and Breast Cancer Risk:

Posted by D3forU on June 14, 2011

Am J Epidemiol. 2011 Jun 9. [Epub ahead of print]

Ultraviolet Sunlight Exposure During Adolescence and Adulthood and Breast Cancer Risk: A Population-based Case-Control Study Among Ontario Women.

Abstract

Recent studies suggest that vitamin D may be associated with reduced breast cancer risk, but most studies have evaluated only dietary vitamin D intake. The associations among ultraviolet radiation from sunlight, factors related to cutaneous vitamin D production, and breast cancer risk were evaluated in a population-based case-control study conducted in Ontario, Canada, between 2003 and 2004 (n = 3,101 cases and n = 3,471 controls).

Time spent outdoors was associated with reduced breast cancer risk during 4 periods of life

>21 vs. ≤6 hours/week age-adjusted odds ratio (OR) = 0.71, 95% confidence interval (CI): 0.60, 0.85 in the teenage years;

OR = 0.64, 95% CI: 0.53, 0.76 in the 20s-30s;

OR = 0.74, 95% CI: 0.61, 0.88 in the 40s-50s; and

OR = 0.50, 95% CI: 0.37, 0.66 in the 60s-74 years.

Sun protection practices and ultraviolet radiation were not associated with breast cancer risk. A combined solar vitamin D score, including all the variables related to vitamin D production, was significantly associated with reduced breast cancer risk. These associations were not confounded or modified by menopausal status, dietary vitamin D intake, or physical activity.

This study suggests that factors suggestive of increased cutaneous production of vitamin D are associated with reduced breast cancer risk.

PubMed Link

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