ESR1 and invasive breast carcinoma: The histological study of the right breast showed invasive breast carcinoma, lobular pleomorphic type, invading seven of the 19 axillary lymph nodes studied and with positive hormone receptors (estrogen receptor (ER), 40%; progesterone receptor (PR), 15%)); Ki67, 12%; and HER 2, negative; stage pT1bN0M0.