Short Communication
British Journal of Cancer (2008) 99, 1502–1505. doi:10.1038/sj.bjc.6604684 www.bjcancer.com
Published online 23 September 2008
Sleep duration and the risk of breast cancer: the Ohsaki Cohort Study
M Kakizaki1,2, S Kuriyama1, T Sone1, K Ohmori-Matsuda1, A Hozawa1, N Nakaya1, S Fukudo2 and I Tsuji1
- 1Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
- 2Division of Behavioral Medicine, Department of Functional Medical Science, Tohoku University Graduate School of Medicine, Sendai, Japan
Correspondence: M Kakizaki, Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Graduate School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan. E-mail: m-kaki@umin.ac.jp
Received 7 July 2008; Revised 29 August 2008; Accepted 1 September 2008; Published online 23 September 2008.
Abstract
In a prospective study of 23 995 Japanese women, short sleep duration was associated with higher risk of breast cancer (143 cases), compared with women who slept 7 h per day, the multivariate hazard ratio of those who slept 
6 h per day was 1.62 (95% confidence interval: 1.05–2.50; P for trend=0.03).
Keywords:
sleep duration, breast cancer, incidence, Japanese, prospective cohort study
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