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In Vitro Bioluminescence Assay to Characterize Circadian Rhythm in Mammary Epithelial Cells
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[Night work, shift work: Breast cancer risk factor?].

J-C Benabu1, F Stoll1, M Gonzalez2

  • 1Pôle de gynécologie-obstétrique, CHRU de Strasbourg, avenue Molière, 67200 Strasbourg cedex, France.

Gynecologie, Obstetrique & Fertilite
|November 25, 2015
PubMed
Summary

Night or shift work is linked to a moderate increase in breast cancer risk, particularly for women with over 20 years of exposure. Further research is needed on monitoring and melatonin supplementation for these workers.

Keywords:
Breast cancer riskMelatoninMélatonineNight workRisque de cancer du seinShift workTravail de nuitTravail posté

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Area of Science:

  • Occupational Health
  • Oncology
  • Chronobiology

Background:

  • The potential link between night/shift work and breast cancer has been a growing concern.
  • Understanding this association is crucial for public health and occupational safety.

Purpose of the Study:

  • To systematically review and determine the association between night/shift work and breast cancer risk.
  • To explore potential mechanisms and influencing factors for this increased risk.

Main Methods:

  • A comprehensive literature search was conducted on the PUBMED database from 1996 to 2015.
  • Keywords included "breast cancer risk", "night work", and "shift work".
  • A total of 25 relevant articles were selected for analysis.

Main Results:

  • Meta-analyses indicated a relative risk (RR) for breast cancer ranging from 1.09 (95% CI: 1.02-1.20) to 1.48 (95% CI: 1.36-1.61) for night/shift workers.
  • Some studies did not find a significant association, highlighting the complexity of the relationship.
  • Potential mechanisms include circadian rhythm disruption, altered melatonin secretion, hormonal status, geographic origin, lifestyle, and vitamin D deficiency.
  • A dose-effect relationship may exist, with risk increasing with years of night/shift work.

Conclusions:

  • Night/shift work is associated with a moderate increase in breast cancer risk, especially for women with over 20 years of employment in such roles.
  • Recommendations for enhanced breast cancer monitoring in this population are suggested.
  • The efficacy of melatonin supplementation as a preventive measure requires further investigation.