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Open AccessArticle

Night Shift Work—A Risk Factor for Breast Cancer

Department of Hygiene and Epidemiology, Department of Hygiene and Health Promotion; Faculty of Health Sciences, Medical University of Lodz, 90-647 Łódź, Poland
Department of Spatial Econometrics, Faculty of Economics and Sociology, University of Lodz, 90-255 Łódź, Poland
Department of Work Physiology and Ergonomics, Nofer Institute of Occupational Medicine in Łódź, 91-348 Łódź, Poland
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(2), 659;
Received: 12 December 2019 / Revised: 15 January 2020 / Accepted: 18 January 2020 / Published: 20 January 2020
(This article belongs to the Special Issue Social, Economic, and Environmental Determinants of Chronic Diseases)
Shift work is considered a risk factor for some health problems. This study aimed to determine whether night shift work is a significant factor for breast cancer risk. The case–control study was conducted from 2015–2019 in the Łódź region. The case group included 494 women diagnosed with malignant breast cancer; the control group included 515 healthy women. The research tool was an anonymous questionnaire. In the case group, the percentage of women working shift work was 51.9%, whereas in the control group, it was 34.1% (OR = 2.08 (95% CI: 1.61; 2.69)). A more insightful examination of shift work showed that only night work has a significant impact on breast cancer (OR = 2.61 (95% CI: 1.94; 3.53)). Even after considering the effect of other possible cancer factors (like high BMI, smoking, early menstruation, late menopause, pregnancy history, age, place of living, education), the odds of developing cancer were twice as high in the group of shift workers (OR = 2.20 (95% CI: 1.57; 3.08)). Considering a significantly higher risk of cancer among people working at night and a high percentage of such employees in Poland, the government should consider special action in the prophylactic treatment of cancers. View Full-Text
Keywords: shift work; breast cancer; occupational choice; public health; value of life shift work; breast cancer; occupational choice; public health; value of life
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Szkiela, M.; Kusideł, E.; Makowiec-Dąbrowska, T.; Kaleta, D. Night Shift Work—A Risk Factor for Breast Cancer. Int. J. Environ. Res. Public Health 2020, 17, 659.

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