ERBB2 and invasive ductal breast carcinoma: Regarding patient preference, a modified radical left mastectomy was performed in May/2012 with an anatomopathological report showing the presence of ductal invasive carcinoma with positive hormonal receptors, HER2-negative status, and proliferative index (Ki67) of 18% – pT2N2M0 according to the 8th edition of American Joint Committee on Cancer.