Cost-Effectiveness of Trastuzumab Deruxtecan in Patients with Unresectable or Metastatic HER2-Low Breast Cancer Who Have Received Prior Chemotherapy.

Introduction: In 2021, breast cancer affected 75,619 women in Denmark. Approximately 50% of breast cancers are considered human epidermal growth factor receptor 2 (HER2)-low. The DESTINY-Breast04 (DB-04) trial led to European Medicines Agency (EMA) approval of trastuzumab deruxtecan (T-DXd) as a treatment for patients with unresectable or metastatic HER2-low breast cancer who have received prior chemotherapy in the metastatic setting or developed disease recurrence during or within 6 months of completing adjuvant chemotherapy.