Sleep and Survival Among Women with Breast Cancer: 30 Years of Follow-up Within the Nurses' Health Study

Overview

Journal Br J Cancer

Specialty Oncology

Date 2017 Mar 31

PMID 28359077

Citations 44

Authors

Claudia Trudel-Fitzgerald

Eric S Zhou

Elizabeth M Poole

Xuehong Zhang

Karin B Michels

A Heather Eliassen

Wendy Y Chen

Michelle D Holmes

Shelley S Tworoger

Eva S Schernhammer

Affiliations

Soon will be listed here.

Abstract

Background: Breast cancer is a leading cause of cancer death in women. Sleep has been linked with mortality among cancer-free population; however, its association with survival among women with breast cancer is understudied.

Methods: Breast cancer patients (N=3682) reported their average sleep duration post diagnosis. Subsamples also provided their pre-diagnosis sleep duration (n=1949) and post-diagnosis sleep difficulties (n=1353). Multivariate Cox models estimated hazard ratios (HR) and confidence intervals (CI) of all-cause, breast cancer, and non-breast cancer mortality.

Results: At diagnosis, the mean age was 64.9 years and 91.7% were stage I or II. Women sleeping ⩾9 h per night post diagnosis had a strong higher risk of all-cause (multivariate HRs: MV-HR=1.37, CI=1.10-1.71), breast cancer (MV-HR=1.46, CI=1.02-2.07), and non-breast cancer mortality (MV-HR=1.34, CI=1.01-1.79), compared to women sleeping 8 h per night. Increased sleep duration post diagnosis (vs unchanged) and regular sleep difficulties (vs rare/none) were associated with a strong elevated risk of all-cause mortality (MV-HR=1.35, CI=1.04-1.74; MV-HR=1.49, CI=1.02-2.19) and a moderate greater risk of breast cancer and non-breast cancer mortality.

Conclusions: Various facets of sleep were associated with higher all-cause mortality risk. If replicated, these findings support evaluation of breast cancer patients' sleep duration and difficulties to identify those at risk for poorer outcomes.

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