ER as a predictor of early breast cancer (EBC) outcomes in patients.

590 Background: Some ER-negative (ER-) breast cancers express low levels of estrogen receptors and approximately 12% express androgen receptors (Traina, T, et al. ASCO, 2012). Whether young premenopausal women (age 40yrs and by ER status. Results: In the two studies combined, ER- patients ≤40 ha...