Sleep duration and breast cancer risk among black and white women.

ABSTRACT:

Background

Sleep has been suggested to influence breast cancer risk; however, the evidence is mixed. Black women have a higher prevalence of both short (<6 h) and long (≥9 h) sleep duration and are more likely to develop more aggressive, hormone receptor-negative breast cancer. No study has examined the relationship between sleep and breast cancer in blacks. We focused on race-specific associations among the blacks.

Methods

In the Southern Community Cohort Study (SCCS), a prospective study of which two-thirds of the population were black, we prospectively investigated self-reported sleep duration in relation to overall breast cancer risk by estrogen (ER) and progesterone receptor (PR) status in all women and in black women alone.

Results

Sleep duration was not associa

SUBMITTER: Xiao Q 

PROVIDER: S-EPMC4913026 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature