The impact of night shift work on breast cancer: Results from the Burden of Occupational Cancer in Canada Study

Source avec lien : American Journal of Industrial Medicine, Prépublication, 2019. 10.1002/ajim.22999

Cette étude estime la proportion et le nombre de cas de cancer du sein chez les femmes au Canada attribuables au travail de nuit. En calculant et en enlevant les fractions attribuables à la population (FAP) chez les Canadiennes qui ont déjà travaillé de nuit ou en rotation de 1961 à 2000, les auteurs ont obtenu le nombre de cas attribuables. Entre 470 et 1200 cas de cancer du sein en 2011 étaient probablement attribuables au travail par quarts, dont 38 % auraient été diagnostiqués chez des femmes occupant des emplois liés à la santé.

Background : We estimated the proportion and number of female breast cancer cases in Canada attributable to night shift work, a probable cause of breast cancer. Methods : Levin’s equation was used to calculate population attributable fractions (PAFs) among Canadian women who ever worked night/rotating shifts from 1961 to 2000, accounting for labor turnover and survival to the year 2011. The calculated PAFs were applied to 2011 Canadian breast cancer incidence statistics to obtain the number of attributable cases. Results : Approximately 1.5 million women ever worked night/rotating shifts during 1961-2000 and survived to 2011. The PAFs ranged from 2.0% (95% confidence interval [CI]: 1.4-6.2) to 5.2% (95% CI: 3.7-13.6), and 470 to 1200 incident breast cancer cases in 2011 were likely due to shift work, of which 38% would have been diagnosed among women in health-related occupations. Conclusions : More research is needed to increase the certainty of this association, but current evidence supports workplace-based prevention.

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