Adjuvant Trastuzumab: Do we finally know how long is not too long?

Anti–human epidermal growth factor receptor 2 (anti-HER2)-targeted treatment is the standard of care for treating HER2-positive breast cancer in the adjuvant, neoadjuvant, and metastatic setting. Trastuzumab was the first anti-HER2 therapy introduced and is the most widely used anti-HER2 drug.