Type of Postneoadjuvant Systemic Therapy by Type of Surgery
Abbreviations: ALND, axillary lymph node dissection; CDK4/6, cyclin-dependent kinase 4/6; GnRH, gonadotropin-releasing hormone; PARP, poly ADP ribose polymerase; T-DM1, trastuzumab emtansine–DM1.Difference in proportions.