ArticleCancer causes & control : CCC2020
Sleep deficiency and breast cancer risk among postmenopausal women in the California teachers study (CTS).
Article in Cancer causes & control : CCC, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
12 citing papers in PubMed, 1 synthesis or guideline pooled it, 13 citations in OpenAlex.
- Sleep Traits to the Risk of Breast Cancer Disease Incidence, Adverse Progression and Mortality: Evidence From a Global Systematic Review and Meta-Analysis.International journal of public health · 2025Pooled it
- Association between noise pollution exposure and incident breast cancer in the Sister Study.Environmental research · 2026Article
- Association of diabetes mellitus and breast cancer in adult men and women: a cross-sectional survey.BMC cancer · 2025Article
- A narrative review of sleep and breast cancer: from epidemiology to mechanisms.Cancer causes & control : CCC · 2025Review
- Night shift work and breast cancer risk - 2023 update of epidemiologic evidence.Journal of the National Cancer Center · 2025Review
- Telomere length and chronotype among women in the California Teachers Study (CTS).Chronobiology international · 2024Article
- Eyes Wide Open: Sleep as a Potential Contributor to Racial and Ethnic Disparities in Cancer.Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology · 2024Review
- Prospective analysis of sleep characteristics, chronotype, and risk of breast cancer in the california teachers study.Cancer causes & control : CCC · 2024Article
- Sleep duration and mortality among breast cancer survivors in the Western New York Exposures and Breast Cancer (WEB) Study.Cancer causes & control : CCC · 2024Article
- Time Spent Outdoors and Associations with Sleep, Optimism, Happiness and Health before and during the COVID-19 Pandemic in Austria.Clocks & sleep · 2023Article
- Sleep and breast and prostate cancer risk in the MCC-Spain study.Scientific reports · 2022Article
- Environmental Influences on Sleep in the California Teachers Study Cohort.American journal of epidemiology · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors at 3 institutions in 1 country.
Funding
Abstract
purposeThere is provocative, yet inconsistent, evidence that sleep deficiency may influence the development of breast cancer. The purpose of this study was to evaluate the risk of breast cancer associated with sleep deficiency among postmenopausal women in the California Teachers Study (CTS).
methodsWe conducted a case-control study of 2,856 invasive breast cancer cases and 38,649 cancer-free controls, nested within the CTS. Self-administered questionnaires were used to ascertain several components of sleep deficiency, including quality, latency, duration, disturbance and use of sleep medications. Additionally, a Global Sleep Index (GSI) was created by summing the individual sleep components and categorizing into quartiles. Multivariable logistic regression analyses were used to estimate odds ratios and 95% confidence intervals (OR, 95% CI).
resultsIncreased breast cancer risks were associated with sleep deficiency. With the exception of duration, linear increases in risk were associated with all the other individual components of sleep deficiency (p-trend ≤ 0.002). The OR for the highest GSI quartile vs. lowest was 1.24, 95% CI 1.12-1.38; p-trend < 0.001).
conclusionsSleep deficiency may be a risk factor for breast cancer. Additional prospective studies and those aimed at elucidating underlying mechanism are warranted.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.