Sara A. Hurvitz, MD, Assistant Professor of Medicine, Division of Hematology/Oncology, David Geffen School of Medicine at UCLA speaks about the SABCS 2021 Abstract – GS3-01 Trastuzumab deruxtecan (T-DXd; DS-8201a) vs. trastuzumab emtansine (T-DM1) in patients (pts) with HER2+ metastatic breast cancer (mBC): subgroup analyses from the randomized phase 3 study DESTINY-Breast03.