Volume 125, Issue 6 pp. 1414-1423
Epidemiology

Life course sun exposure and risk of prostate cancer: Population-based nested case-control study and meta-analysis

Rebecca Gilbert

Corresponding Author

Rebecca Gilbert

Department of Social Medicine, University of Bristol, Bristol, United Kingdom

Fax: +44-117-3313914.

University of Bristol, Department of Social Medicine, Canynge Hall, 39 Whatley Road, Bristol BS8 2PS, United KingdomSearch for more papers by this author
Chris Metcalfe

Chris Metcalfe

Department of Social Medicine, University of Bristol, Bristol, United Kingdom

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Steven E. Oliver

Steven E. Oliver

Department of Health Sciences, University of York and the Hull York Medical School, York, United Kingdom

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David C. Whiteman

David C. Whiteman

Division of Population Studies and Human Genetics, Queensland Institute of Medical Research, Queensland, Australia

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Chris Bain

Chris Bain

School of Population Health, The University of Queensland, Queensland, Australia

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Andy Ness

Andy Ness

Department of Oral and Dental Science, University of Bristol, Bristol, United Kingdom

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Jenny Donovan

Jenny Donovan

Department of Social Medicine, University of Bristol, Bristol, United Kingdom

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Freddie Hamdy

Freddie Hamdy

Nuffield Department of Surgery, University of Oxford, Oxford, United Kingdom

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David E. Neal

David E. Neal

Department of Oncology, University of Cambridge, Cambridge, United Kingdom

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J. Athene Lane

J. Athene Lane

Department of Social Medicine, University of Bristol, Bristol, United Kingdom

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Richard M. Martin

Richard M. Martin

Department of Social Medicine, University of Bristol, Bristol, United Kingdom

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First published: 14 July 2009
Citations: 47

Abstract

There is currently no means of primary prevention for prostate cancer. Increased exposure to ultraviolet-radiation may be protective, but the literature is inconclusive. We investigated associations of life course exposure to sunlight with prostate cancer. The study design was a UK-wide nested case-control study, based on 1,020 prostate specific antigen-detected cases and 5,044 matched population controls and a systematic review with meta-analysis. Men with olive/brown skin (OR = 1.47; 95% CI: 1.00 to 2.17), men who burnt rarely/never (OR = 1.11; 0.95 to 1.29) and men with the lowest levels of intense sun exposure in the 2 years prior to diagnosis (OR = 1.24; 1.03 to 1.50) had an increased prostate cancer risk. However, amongst men with prostate cancer, spending less time outside was associated with a reduced risk of advanced cancer (OR = 0.49; 0.27 to 0.89) and high Gleason grade (OR = 0.62; 0.43 to 0.91), and men who burnt rarely/never had a reduced risk of advanced cancer (OR = 0.71; 0.47 to 1.08). The meta-analysis provided weak evidence that men with the lowest (versus highest) sunlight exposure had an increased prostate cancer risk (4 studies, random-effects pooled relative risk = 1.13; 0.98 to 1.29) and higher advanced or fatal prostate cancer risk (6 studies, random-effects pooled relative risk = 1.14; 0.98 to 1.33). Our data and meta-analyses provide limited support for the hypothesis that increased exposure to sunlight may reduce prostate cancer risk. The findings warrant further investigation because of their implications for vitamin D chemoprevention trials. © 2009 UICC

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