187P Development of a patient-centered core outcome set for metastatic breast cancer

Outcomes for breast cancer are monitored through the International Consortium for Health Outcomes Measurement core outcomes set (COS). This COS is deemed less relevant for women with metastatic breast cancer (MBC). We aimed to develop a COS applicable for a heterogeneous group of patients with metachronous or synchronous MBC. The study was part of the Innovative Medicines Initiative - Health Outcomes Observatory (H2O) project, creating a governance model for health data that captures the patient perspective on the impact of cancer.