ArticleChronobiology international2013
Chronotype and breast cancer risk in a cohort of US nurses.
Article in Chronobiology international, 2013. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 22 papers, 2 of them syntheses 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.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
22 citing papers in PubMed, 2 syntheses or guidelines pooled it, 52 citations in OpenAlex.
- Pooled it
- Chronotype Differences in Energy Intake, Cardiometabolic Risk Parameters, Cancer, and Depression: A Systematic Review with Meta-Analysis of Observational Studies.Advances in nutrition (Bethesda, Md.) · 2022Pooled it
- The multifaceted impact of circadian disruption on cancer risk: a systematic review of insights and economic implications.Journal of the National Cancer Center · 2025Review
- Cancer Patients Circadian Rhythm Assessment Based on Morningness-Eveningness Preference: A Cross-Sectional Study.Health science reports · 2025Article
- A narrative review of sleep and breast cancer: from epidemiology to mechanisms.Cancer causes & control : CCC · 2025Review
- Chronotype and Cancer: Emerging Relation Between Chrononutrition and Oncology from Human Studies.Nutrients · 2025Review
- Prospective analysis of sleep characteristics, chronotype, and risk of breast cancer in the california teachers study.Cancer causes & control : CCC · 2024Article
- Evening chronotype predicts dropout of physical exercise: a prospective analysis.Sport sciences for health · 2023Article
- A multidisciplinary perspective on the complex interactions between sleep, circadian, and metabolic disruption in cancer patients.Cancer metastasis reviews · 2021Review
- Chronotype and risk of post-menopausal endometrial cancer in the California Teachers Study.Chronobiology international · 2021Article
- Association of Insomnia, Depressive Disorders, and Mood Disorders as Risk Factors With Breast Cancer: A Nationwide Population-Based Cohort Study of 232,108 Women in Taiwan.Frontiers in oncology · 2021Article
- Depressive Symptoms, Sleep Profiles and Serum Melatonin Levels in a Sample of Breast Cancer Patients.Nature and science of sleep · 2020Article
- Chronotype and postmenopausal breast cancer risk among women in the California Teachers Study.Chronobiology international · 2019Article
- Investigating causal relations between sleep traits and risk of breast cancer in women: mendelian randomisation study.BMJ (Clinical research ed.) · 2019Article
- The role of chronotype, circadian misalignment, and tiredness in the substance use behaviors of gay and bisexual men.Psychology of sexual orientation and gender diversity · 2019Article
- Identifying shift worker chronotype: implications for health.Industrial health · 2018Review
- Persistence of social jetlag and sleep disruption in healthy young adults.Chronobiology international · 2018Article
- Sleep disruption, chronotype, shift work, and prostate cancer risk and mortality: a 30-year prospective cohort study of Finnish twins.Cancer causes & control : CCC · 2016Article
- Breast cancer risk and night shift work in a case-control study in a Spanish population.European journal of epidemiology · 2016Article
- How sedentary and physically active are breast cancer survivors, and which population subgroups have higher or lower levels of these behaviors?Supportive care in cancer : official journal of the Multinational Association of Supportive Care in Cancer · 2016Article
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 4 institutions in 1 country.
Funding
Abstract
The aim of this study was to examine the relation between chronotype and breast cancer risk. We analyzed the association between chronotype (definite morning type, probable morning type, probable evening type, definite evening type, or neither morning nor evening type) and breast cancer risk among 72 517 women in the Nurses' Health Study II (NHS II). Chronotype was self-reported in 2009, and 1834 breast cancer cases were confirmed among participants between 1989 and 2007; a 2-yr lag period was imposed to account for possible circadian disruptions related to breast cancer diagnosis. Age- and multivariable-adjusted logistic regression was used to estimate odds ratios (ORs) and 95% confidence intervals (CIs). Participants who self-reported as neither morning nor evening type had a 27% increased risk of breast cancer (multivariable-adjusted OR = 1.27, 95% CI = 1.04-1.56), compared with definite morning types. None of the other chronotypes were significantly associated with breast cancer risk (multivariable-adjusted OR = 0.99, 95% CI = 0.87-1.12 for probable morning versus definite morning types; OR = 0.96, 95% CI = 0.84-1.09 for probable evening versus definite morning types; and OR = 1.15, 95% CI = 0.98-1.34 for definite evening versus definite morning types). Overall, chronotype was not associated with breast cancer risk in our study. A modestly increased risk among neither morning nor evening types may indicate circadian disruption as a potentially underlying mechanism; however, more studies are needed to confirm our results.
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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.