Evidence map›Paper›PMID 33653334›Full record

SynthesisBMC women's health2021

Night-shift work duration and breast cancer risk: an updated systematic review and meta-analysis.

E Manouchehri, A Taghipour, V Ghavami, A Ebadi, F Homaei, R Latifnejad Roudsari

Abstract readMeta-AnalysisSystematic Review
PubMed Full text at PMC Publisher
In one paragraph

Synthesis in BMC women's health, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 54 papers, 11 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
54citing papers in PubMed, 11 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

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.

2 · The registry

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.

3 · Its place in the literature

Who cites it

54 citing papers in PubMed, 11 syntheses or guidelines pooled it.

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  14. Occupation and Female Breast Cancer Mortality in South Africa: A Case-Control Study.International journal of environmental research and public health · 2025
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors.

E ManouchehriDepartment of Midwifery, School of Nursing and Midwifery, Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran.ORCID 0000-0002-1353-8358
A TaghipourDepartment of Epidemiology, School of Health, Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran.ORCID 0000-0001-7594-0097
V GhavamiDepartment of Biostatistics, School of Health, Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran.ORCID 0000-0001-6358-0207
A EbadiBehavioral Sciences Research Center, Lifestyle Institute, Baqiyatallah University of Medical Sciences, Tehran, Islamic Republic of Iran.ORCID 0000-0002-2911-7005
F HomaeiCancer Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran.ORCID 0000-0002-7718-5387
R Latifnejad RoudsariDepartment of Midwifery, School of Nursing and Midwifery, Mashhad University of Medical Sciences, Mashhad, Islamic Republic of Iran. latifnejadr@mums.ac.ir.ORCID 0000-0002-1438-8822

Funding

Mashhad University of Medical Sciences 970008
6 · The paper itself

Abstract

backgroundThe International Agency for Research on Cancer (IARC) has classified shift work as a possible human carcinogen. The results of systematic on this topic is contradictory. This systematic review and meta-analysis, therefore, aimed to update the current evidence regarding the relationship between night-shift work duration and breast cancer risk.

methodsPubMed, Web of Science, and Scopus as well as reference list of included studies were searched until December 19, 2020. Observational case-control or cohort studies investigating the relationship between the duration of night-shift work and breast cancer in women were included, which all quantified night-shift work exposure. All statistical analyses were done by Stata version 11.2.

resultsOur literature search was resulted in retrieval of 4854 publications from which 26 eligible studies with 1,313,348 participants were included in the meta-analyses. The pooled relative risk (RR) and 95% confidence intervals (CIs) of breast cancer for short-term night-shift workers (< 10 years) was 1.13 (95% CI 1.03-1.24, p = 0.008, I

conclusionsThis systematic review found a positive statistical relationship between night work and breast cancer risk in short-term night-shift workers but no increase was observed in the long-term night-shift workers.

Indexed as

Breast NeoplasmsShift Work ScheduleCase-Control StudiesCohort StudiesFemaleHumansRiskRisk FactorsWork Schedule ToleranceBreast cancerMeta-analysisNight-shift workShift-workSystematic review

Identifiers

PMID33653334
PMCPMC7927396

What Socratic holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

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 Socratic graph.