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Author Ritonja, J.; McIsaac, M.A.; Sanders, E.; Kyba, C.C.M.; Grundy, A.; Cordina-Duverger, E.; Spinelli, J.J.; Aronson, K.J. url  doi
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  Title Outdoor light at night at residences and breast cancer risk in Canada Type Journal Article
  Year 2020 Publication European Journal of Epidemiology Abbreviated Journal Eur J Epidemiol  
  Volume in press Issue Pages  
  Keywords Human Health; Breast cancer; Case-control study; Circadian disruption; Light at night; Night work; Women's health  
  Abstract Experimental and epidemiologic studies suggest that light at night (LAN) exposure disrupts circadian rhythm, and this disruption may increase breast cancer risk. We investigated the potential association between residential outdoor LAN and breast cancer risk. A population-based case-control study was conducted in Vancouver, British Columbia and Kingston, Ontario, Canada with incident breast cancer cases, and controls frequency matched by age in the same region. This analysis was restricted to 844 cases and 905 controls who provided lifetime residential histories. Using time-weighted average duration at each home 5-20 years prior to study entry, two measures of cumulative average outdoor LAN were calculated using two satellite data sources. Logistic regression was used to estimate the relationship between outdoor LAN and breast cancer risk, considering interactions for menopausal status and night shift work. We found no association between residential outdoor LAN and breast cancer for either measure of LAN [OR comparing highest vs. lowest tertile (DNB) = 0.95, 95% CI 0.70-1.27]. We also found no association when considering interactions for menopausal status and past/current night work status. These findings were robust to changes to years of residential data considered, residential mobility, and longer exposure windows. Our findings are consistent with studies reporting that outdoor LAN has a small effect or no effect on breast cancer risk.  
  Address Division of Cancer Care and Epidemiology, Cancer Research Institute, Queen's University, Kingston, ON, Canada. aronson@queensu.ca  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0393-2990 ISBN Medium  
  Area Expedition Conference (up)  
  Notes PMID:32026169 Approved no  
  Call Number GFZ @ kyba @ Serial 2826  
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