Background: The introduction of cyclin-dependent kinases 4 and 6 inhibitors (CDK4/6is) has transformed the treatment landscape for patients with hormone receptor positive (HR+) and human epidermal growth factor receptor 2 negative (HER2-) metastatic breast cancer (MBC). To our knowledge, no studies have quantified health care resource utilization (HRU) or economic burden following CDK4/6i initiation in the Medicare population.
Objective: To describe HRU and quantify health care costs among Medicare-enrolled patients with HR+ HER2- MBC treated with CDK4/6is in the first-line setting.