In this episode, we’ll cover three important presentations from the San Antonio Breast Cancer Symposium. The first reports results from the HER2CLIMB trial on tucatinib, capecitabine, and trastuzumab for patients with HER2-positive metastatic breast cancer; the second discusses phase II findings on the activity of a novel HER2-targeting antibody-drug conjugate in HER2-positive metastatic breast cancer; and the third focuses on a postoperative treatment regimen for hormone receptor–positive, HER2-negative primary breast cancer.