ERBB2 and invasive ductal breast carcinoma: At 53 years old, an invasive ductal carcinoma of the left breast was diagnosed (G3, stage IA T1N0M0, Er+, 50%, Pr+, 30%, HER2 3+), and it was treated with neoadjuvant and adjuvant therapy with Trastuzumab and Pertuzumab, quadrantectomy, and radiotherapy.