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Associations between estrogen-alone therapy (ET) at baseline and risk of breast cancer, by estrogen and progesterone receptor status and histology type, among eligible postmenopausal women with hysterectomy (n = 50,476) in the entire National Institutes of Health-AARP Diet and Health Study cohort (1996/1997–2011). BC, breast cancer. ER, estrogen receptor. PR, progesterone receptor
