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Rotating night shifts and risk of breast cancer in women participating in the nurses׳ health study
Open accessAbstract
BACKGROUND: Melatonin shows potential oncostatic action, and light exposure during night suppresses melatonin production. There is little information, however, about the direct effect of night work on the risk of cancer. We investigated the effect of night work in breast cancer. METHODS: We examined the relationship between breast cancer and working on rotating night shifts during 10 years of follow-up in 78 562 women from the Nurses' Health Study. Information was ascertained in 1988 about the total number of years during which the nurses had worked rotating night shifts with at least three nights per month. From June 1988 through May 1998, we documented 2441 incident breast cancer cases. Logistic regression models were used to calculate relative risks (RRs) and 95% confidence intervals (CIs), adjusted for confounding variables and breast cancer risk factors. All statistical tests were two-sided. RESULTS: We observed a moderate increase in breast cancer risk among the women who worked 1-14 years or 15-29 years on rotating night shifts (multivariate adjusted RR = 1.08 [95% CI = 0.99 to 1.18] and RR = 1.08 [95% CI = 0.90 to 1.30], respectively). The risk was further increased among women who worked 30 or more years on the night shift (RR = 1.36; 95% CI = 1.04 to 1.78). The test for trend was statistically significant (P =.02). CONCLUSIONS: Women who work on rotating night shifts with at least three nights per month, in addition to days and evenings in that month, appear to have a moderately increased risk of breast cancer after extended periods of working rotating night shifts.
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“Among women with ≥30 years of rotating night shift work, breast cancer mortality was non-significantly increased by 47% in the current study, which is somewhat consistent with a previous report in the same cohort14 describing a significant 36% increase in breast cancer incidence.”
From Total and Cause-Specific Mortality of U.S. Nurses Working Rotating Night Shifts (2015) · cites this paper as [14]
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Metadata
- Authors
- Schernhammer, E. S., Laden, F., Speizer, F. E., Willett, W. C., Hunter, D. J., Kawachi, I., & Colditz, G. A.
- Affiliations
- Brigham and Women's Hospital (US)
- Corresponding author
- Schernhammer, E. S.
- Venue
- JNCI Journal of the National Cancer Institute
- Publisher
- Oxford University Press (OUP)
- Published
- 2001-10-17
- Volume
- 93
- Issue
- 20
- Pages
- 1563-1568
- ISSN
- 0027-8874 (ISSN-L)
- 1460-2105
- OpenAlex
- W2142622103
- Cited by
- 1,142
- References
- 57
- Citations by year
- 2026: 18 · 2025: 22 · 2024: 34 · 2023: 27 · 2022: 38 · 2021: 42 · 2020: 54 · 2019: 50 · 2018: 40 · 2017: 60 · 2016: 51 · 2015: 60 · 2014: 55 · 2013: 79 · 2012: 77
- FWCI
- 40.32
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- JNCI Journal of the National Cancer Institute (publishedVersion)
- PubMed (publishedVersion)
- Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
- Funders
- National Cancer Institute (CA-87969, P01CA087969)
- National Institute of Environmental Health Sciences (ES62984)
- Topics
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Health Sciences › Medicine › Oncology › Cancer Risks and Factors
- Keywords
- rotating night shifts, breast cancer risk, night work, melatonin, light exposure, nurses, occupational cancer risk
- MeSH terms
- Adult, Breast Neoplasms, Circadian Rhythm, Female, Follow-Up Studies, Humans, Light, Lighting, Melatonin, Middle Aged, Nurses, Pineal Gland, Surveys and Questionnaires, Risk, Risk Factors, Secretory Rate, Work Schedule Tolerance, Cohort Studies, Multicenter Studies as Topic, Incidence, Premenopause, Postmenopause
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