Journal
INTERNATIONAL JOURNAL OF CANCER
Volume 134, Issue 5, Pages 1166-1173Publisher
WILEY
DOI: 10.1002/ijc.28452
Keywords
breast cancer; sleep duration; meta-analysis
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Funding
- Eleven Five Significant New Drugs Creation Special Science and Technology [2008ZX09312-007, 2009ZX09312-025]
- National Science and Technology Projects [2008ZX10002-018]
- Leading Talents of Science in Shanghai [022]
- Key Discipline Construction of Evidence-Based Public Health in Shanghai [12GWZX0602]
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Studies on the association of short or long sleep duration with breast cancer risk have reported inconsistent results. We quantitatively assessed this association by conducting a meta-analysis based on the evidence from observational studies. In April 2013, we performed electronic searches in PubMed, EmBase and the Cochrane Library to identify studies examining the effect of sleep duration on breast cancer incidence. The odds ratio (OR) was used to measure any such association in a random-effects model. The analysis was further stratified by confounding factors that could bias the results. A total of six studies (two case-control and four cohort studies) involving 159,837 individuals were included in our meta-analysis. Our study did not show an association between either short or long sleep duration and breast cancer risk (short sleep duration data: pooled OR = 1.01, 95% confidence interval (CI) = 0.90-1.14, p = 0.853; long sleep duration data: pooled OR = 0.95, 95% CI = 0.86-1.04, p = 0.251). Moreover, we did not identify any statistically significant association between sleep duration and breast cancer risk in all the subgroup analyses. In conclusion, our findings indicate that sleep duration has no effect on breast cancer risk.
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