ESR1 and invasive ductal breast carcinoma: At that time she underwent a left radical mastectomy and a right concervative breast cancer treatement (tumerectomy) associated with bilateral axillary lymph node dissection.Pathology was consistent with a multifocal infiltrating ductal carcinoma with 15 metastatic lymphnodes out of 16 at the left breast and an infiltrating ductal carcinoma measuring 1.5cm with no positif lymphnodes out of 15 at the left breast, ER/PR + and Her-2 Neu+.