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Sleep duration associated with higher colorectal cancer risk
Date:4/30/2013

A new study is the first to report a significant positive association between long sleep duration and the development of colorectal cancer, especially among individuals who are overweight or snore regularly. The results raise the possibility that obstructive sleep apnea may contribute to cancer risk.

"Our current study adds to the very limited literature regarding the relationship between sleep duration and/or sleep quality and colorectal cancer risk," said lead author Xuehong Zhang, MD, ScD, instructor in the Department of Medicine at Harvard Medical School and associate epidemiologist at Brigham and Women's Hospital in Boston. "The novel observation of increased risk among regular snorers who sleep long raises the possibility that sleep apnea and its attendant intermittent hypoxemia may contribute to cancer risk."

The study, which appears in the May issue of the journal Sleep, utilized data from two prospective cohort studies, the Health Professionals Follow-up Study (HPFS) and the Nurses' Health Study (NHS). A biennial questionnaire is sent to participants in each cohort to collect information on demographics, lifestyle factors and disease endpoints. Participants estimated their total hours of sleep in a 24-hour period and were asked if they snore.

A total of 76,368 women and 30,121 men formed the baseline population for this analysis. At baseline the median age was 53 years for women and 56 years for men. The researchers documented a total of 1,973 incident colorectal cancer cases: 1,264 cases in NHS (1986-2008) and 709 cases in HPFS (1988-2008). In subgroup analyses, men or women who were overweight or who were regular snorers and who reported sleeping 9 hours or more per day had approximately a 1.4 to 2-fold increased risk of developing colorectal cancer compared to overweight or regular snorers with 7 hours of sleep per day.

The American Academy of Sleep Medicine reports that individual sleep needs vary. Howev
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Contact: Lynn Celmer
lcelmer@aasmnet.org
630-737-9700
American Academy of Sleep Medicine
Source:Eurekalert

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