ERBB2 and breast cancer: Among the 88 patients with HER2-negative breast cancer at high risk of relapse after NACT, grade 1-4 adverse events (AEs) occurred in all 45 (100%) patients receiving sacituzumab govitecan and in 37 of 43 (86%) of patients with treatment of physician’s choice: capecitabine (n = 32) or observation (n = 11).