Sleep duration and the risk of breast cancer: the Ohsaki Cohort Study

Kakizaki, Masako; Kuriyama, Shinichi; Sone, Toshimasa; Ohmori-Matsuda, Kaori; Hozawa, Atsushi; Nakaya, Naoki; Fukudo, Shin; Tsuji, Ichiro

doi:10.1038/sj.bjc.6604684

Cited by 166 publications

(165 citation statements)

References 23 publications

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“…Finally, 12 articles fulfilling the inclusion criteria were included in the meta-analysis. Among these 12 articles, five studies reported breast cancer (Verkasalo et al, 2005;Pinheiro et al, 2006;Kakizaki et al, 2008b;Vogtmann et al, 2013;Wu et al, 2013), two studies on colorectal cancer (Jiao et al, 2013;Zhang et al, 2013), one each study on prostate cancer (Kakizaki et al, 2008a), endometrial cancer (Sturgeon et al, 2012), epithelial ovarian cancer (Weiderpass et al, 2012), thyroid cancer (Luo et al, 2013), and all type cancers (von Ruesten et al, 2012).…”

Section: Search Resultsmentioning

confidence: 99%

“…Overall, the total number of participants included was 723,337, with 15,156 reported cancer outcomes. Six studies were performed in USA, three in Japan (Kakizaki et al, 2008b;Weiderpass et al, 2012), and one each from German (von Ruesten et al, 2012), Finland (Verkasalo et al, 2005), and Singapore (Wu et al, 2008). The study samples ranged from 12, 222 to 142, 933, and the median of the follow-up durations is 11.3 years.…”

Section: Study Characteristicsmentioning

confidence: 99%

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Sleep Duration and Cancer Risk: a Systematic Review and Meta-analysis of Prospective Studies

Zhao¹,

Yin²,

Yang³

et al. 2013

Asian Pacific Journal of Cancer Prevention

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To assess the risk of cancers associated with sleep duration using meta-analysis of published cohort studies, we performed a comprehensive search using PubMed, Embase and Web of Science through October 2013. We combined hazard ratios (HRs) from individual studies using meta-analysis approaches. A random effect dose-response analysis was used to evaluate the relationship between sleep duration and cancer risk. Subgroup analyses and sensitivity analyses were also performed. Publication bias was evaluated using Funnel plots and Begg's test. A total of 13 cohorts from 12 studies were included in this meta-analysis, which included 723, 337 participants with 15, 156 reported cancer outcomes during a follow-up period ranging from 7.5 to 22 years. The pooled adjusted HRs were 1.06 (95% CI: 0.92, 1.23; P for heterogeneity =0.003) for short sleep duration, 0.91 (95% CI: 0.78, 1.07; P for heterogeneity <0.0001) for long sleep duration. In subgroup analyses stratified by cancer type, long duration of sleep showed an inverse relation with hormone-related cancer (HR=0.79; 95% CI: 0.65, 0.97; P for heterogeneity =0.009) and a greater risk of colorectal cancer (HR=1.29; 95% CI: 1.09, 1.52; P for heterogeneity =0.346). Further meta-analysis on dose-response relationships showed that the relative risks of cancer were 1.00 (95% CI: 0.99, 1.01; P for linear trend=0.9151) for one hour of sleep increment per day, and 1.00 (95% CI: 0.98, 1.01; P for linear trend=0.7749) for one hour of sleep increment per night. No significant dose-response relationship between sleep duration and cancer was found on non-linearity testing (P=0.5053). Our meta-analysis suggests a positive association between long sleep duration and colorectal cancer, and an inverse association with incidence of hormone related cancers like those in the breast. Studies with larger sample size, longer follow-up times, more cancer types and detailed measure of sleep duration are warranted to confirm these results.

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Section: Search Resultsmentioning

confidence: 99%

Section: Study Characteristicsmentioning

confidence: 99%

Sleep Duration and Cancer Risk: a Systematic Review and Meta-analysis of Prospective Studies

Zhao¹,

Yin²,

Yang³

et al. 2013

Asian Pacific Journal of Cancer Prevention

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show abstract

“…It is well established that shift work at night is related to poor sleep quality and shorter sleep duration (49), and the latter has been associated with increased risk for breast cancer (50). Periods of rest and "power naps" during night shifts can increase alertness but there is no evidence that power naps reduce circadian disruption or prevent breast cancer.…”

Section: Rest and Short Sleep Periods During Night Shiftsmentioning

confidence: 99%

Work at night and breast cancer – report on evidence-based options for preventive actions

Bonde¹,

Hansen²,

Kolstad³

et al. 2012

Scand J Work Environ Health

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“…Melatonin may have an inhibitory effect on gonadal function, including the synthesis and secretion of sex hormones, by promoting the release of gonadotropin-releasing hormone; it also exerts an antiproliferative effect on breast cancer cell lines (32).…”

Section: Lack Of Sleep Linked With Breast Cancermentioning

confidence: 99%