Distinct Reproductive Risk Profiles for Intrinsic-Like Breast Cancer Subtypes : Pooled Analysis of Population-Based Studies
BACKGROUND: Reproductive factors have been shown to be differentially associated with risk of estrogen receptor (ER)-positive and ER-negative breast cancer. However, their associations with intrinsic-like subtypes are less clear.METHODS: Analyses included up to 23 353 cases and 71 072 controls pooled from 31 population-based case-control or cohort studies in the Breast Cancer Association Consortiu