Cited by 1,142Sleep and Work-Related FatigueCircadian rhythm and melatoninCancer Risks and Factors

Rotating night shifts and risk of breast cancer in women participating in the nurses׳ health study

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Schernhammer, E. S., Laden, F., Speizer, F. E., Willett, W. C., Hunter, D. J., Kawachi, I., Colditz, G. A.·2001·JNCI Journal of the National Cancer Institute

Abstract

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, somewhat consistent with a previous report in the same cohort describing a significant 36% increase in breast cancer incidence.

    “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.”

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  1. Baldwin WS, Barrett JC. Melatonin: receptor- mediated events that may affect breast and other steroid hormone-dependent cancers. Mol Carcinog 1998;21:149-55.
  2. Blask DE, Sauer LA, Dauchy RT, Holowachuk EW, Ruhoff MS, Kopff HS. Melatonin inhibi- tion of cancer growth in vivo involves suppres- sion of tumor fatty acid metabolism via mela- tonin receptor-mediated signal. Cancer Res 1999;59:4693-701.
  3. D'Agostino RB, Lee ML, Belanger AJ, Cupples LA, Anderson K, Kannel WB. Rela- tion of pooled logistic regression to time de- pendent Cox regression analysis: the Framing- ham Heart Study. Stat Med 1990;9:1501-15.

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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
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
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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