Abstract:
:Sunlight is essential for the production of vitamin D in the body. Evidence exists to suggest that vitamin D metabolites may have a role in tumor growth suppression. In this large study, involving over a million cancer patients from the United Kingdom, we have analyzed the role of season of diagnosis and sunlight exposure in cancer survival for cancers of the breast, colorectum, lung, prostate and at all sites combined. We used population-based data from the Thames Cancer Registry to analyze cancer survival in periods 0-1 and 0-5 years after diagnosis. The analysis was performed using Cox proportional regression analysis adjusting for age and period at diagnosis and including season of diagnosis and sunlight exposure in the preceding months as factors in the analysis. We found evidence of substantial seasonality in cancer survival, with diagnosis in summer and autumn associated with improved survival compared with that in winter, especially in female breast cancer patients and both male and female lung cancer patients (hazard ratios 0.86 [95% CI 0.83-0.89], 0.95 [95% CI 0.92-0.97] and 0.95 [95% CI 0.93-0.98] respectively). Cumulative sunlight exposure in the months preceding diagnosis was also a predictor of subsequent survival, although season of diagnosis was a stronger predictor than cumulative sunlight exposure. We found seasonality in cancer survival to be stronger in women than in men. Our results add to a growing body of evidence that vitamin D metabolites play an important role in cancer survival.
journal_name
Int J Cancerjournal_title
International journal of cancerauthors
Lim HS,Roychoudhuri R,Peto J,Schwartz G,Baade P,Møller Hdoi
10.1002/ijc.22052subject
Has Abstractpub_date
2006-10-01 00:00:00pages
1530-6issue
7eissn
0020-7136issn
1097-0215journal_volume
119pub_type
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