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:: Volume 1, Number 1 (Caspian J Soc Med 2015) ::
Caspian J Soc Med 2015, 1(1): 17-23 Back to browse issues page
Risk of breast cancer among female shift workers (systematic review)
Maryam Nikpour, Mojgan Firouzbakht, Aram Tirgar
Social Determinants of Health Research Center, Babol University of Medical Sciences, Babol, Iran
Abstract:   (1046 Views)

Background: Shift work may increase the risk of breast cancer by decreasing melatonin production. This phenomenon by affecting pituitary gland and sexual hormonal secretion may increase the risk of breast cancer. The aim of this review study was to evaluate the results of studies for determining the relationship between shift work and breast cancer.

Methods: Data collection was done through worksheets appropriate to research objectives and searching among databases, including Medline, Google scholar and Scopus. Search keywords included shift work, night work and breast cancer. Studies were eligible for inclusion if they were observational, case-control or cohort studies that compared female shift workers with day workers. Animal studies, the studies that only examined mortality and benign breast disease, and works related breast cancer without focusing on shiftwork were excluded. Finally, a total of 16 studies consisted of 5 cohorts and 11 case controls were assessed.

Results: Among the prospective cohort studies, two studies reported an increased risk of breast cancer in association with shift work, but the rest did not find any relationship. Four of 11 case-control studies, indicated relation between shift work and breast cancer, but the remaining 7 studies did not report such finding. However 4 of 7 studies demonstrated that possibility of breast cancer will increase with increased number of night work per month and years of night work.  

Conclusion: We concluded that shift work is a certain threat for females’ health, and there may be the increased risk of breast cancer associated with long term night shift work.
Keywords: Females, Shift work, Night work, Breast cancer
Full-Text [PDF 241 kb]   (455 Downloads)    
Subject: Social
Received: 2014/10/15 | Accepted: 2015/06/13 | Published: 2015/10/20
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Nikpour M, Firouzbakht M, Tirgar A. Risk of breast cancer among female shift workers (systematic review). Caspian J Soc Med. 2015; 1 (1) :17-23
URL: http://cjsm.mubabol.ac.ir/article-1-30-en.html
Volume 1, Number 1 (Caspian J Soc Med 2015) Back to browse issues page
Caspian Journal of Social Medicine
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