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Sleep duration and cancer risk in women
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    The objective was to conduct an analysis of sleep duration and risk of selected site-specific and groups of cancer among a large prospective cohort of California women.|The study population was comprised of 101,609 adult females participating in the California Teachers Study. All sites of invasive cancer prospectively diagnosed from baseline (1995-1996) through 2011 were identified through linkage to the California Cancer Registry (n = 12,322). Site-specific analyses focused on the following cancers: breast (n = 5,053), colorectal (n = 983), lung (n = 820), melanoma (n = 749), and endometrial (n = 957). Additionally, we evaluated a group of estrogen-mediated cancers consisting of breast, endometrial, and ovarian cancer (n = 6,458). Sleep duration was based on self-report of average time sleeping in the year prior to baseline. Cox proportional hazard models were used to calculate adjusted hazard ratios and 95 % confidence intervals (HRs, 95 % CI).|Point estimates for all sites and site-specific cancers generally were near or below one for short sleepers (<6 h/night) and above one for long sleepers (10+ h/night); confidence intervals, however, were wide and included unity. Compared to average sleepers (7-9 h/night), long sleepers had an increased risk of the group of estrogen-mediated cancers (HR 1.22, 95 % CI 0.97-1.54, p (trend) = 0.04).|These analyses suggest that longer sleep may be associated with increased risks of estrogen-mediated cancers. Further studies with more refined measures of sleep duration and quality are warranted.

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    HHSN261201000035C/CA/NCI NIH HHS/United States
    HHSN261201000036C/CA/NCI NIH HHS/United States
    U58 DP000807/DP/NCCDPHP CDC HHS/United States
    K05 CA136967/CA/NCI NIH HHS/United States
    HHSN261201000035I/CA/NCI NIH HHS/United States
    R01 CA077398/CA/NCI NIH HHS/United States
    R01 CA77398/CA/NCI NIH HHS/United States
    HHSN261201000034C/CA/NCI NIH HHS/United States
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