NDLI: Shift work and breast cancer among women textile workers in Shanghai, China

Content Provider	Springer Nature Link
Author	Li, Wenjin Ray, Roberta M. Thomas, David B. Davis, Scott Yost, Michael Breslow, rman Gao, Dao Li Fitzgibbons, E. Dawn Camp, Janice E. Wong, Eva Wernli, Karen J. Checkoway, Harvey
Copyright Year	2014
Abstract	Although night-shift work has been associated with elevated risk of breast cancer in numerous epidemiologic studies, evidence is not consistent. We conducted a nested case–cohort study to investigate a possible association between shift work including a night shift and risk of breast cancer within a large cohort of women textile workers in Shanghai, China.The study included 1,709 incident breast cancer cases and 4,780 non-cases. Data on historical shift work schedules were collected by categorized jobs from the factories, where the study subjects had worked, and then were linked to the complete work histories of each subject. No jobs in the factories involved exclusively night-shift work. Therefore, night shift was evaluated as part of a rotating shift work pattern. Hazard ratios and 95 % confidence intervals were calculated using Cox proportional hazards modeling adapted for the case–cohort design for years of night-shift work and the total number of nights worked. Additionally, analyses were repeated with exposures lagged by 10 and 20 years.We observed no associations with either years of night-shift work or number of nights worked during the entire employment period, irrespective of lag intervals. Findings from the age-stratified analyses were very similar to those observed for the entire study population.The findings from this study provide no evidence to support the hypothesis that shift work increases breast cancer risk. The positive association between shift work and breast cancer observed in Western populations, but not observed in this and other studies of the Chinese population, suggests that the effect of shift work on breast cancer risk may be different in Asian and Caucasian women.
Starting Page	143
Ending Page	150
Page Count	8
File Format	PDF
ISSN	09575243
Journal	Cancer Causes & Control
Volume Number	26
Issue Number	1
e-ISSN	15737225
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-11-25
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Breast cancer Night-shift work Shift work Dose–response Cancer Research Biomedicine general Oncology Public Health Epidemiology Hematology
Content Type	Text
Resource Type	Article
Subject	Cancer Research Oncology

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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