Long-Term Management of Breast Cancer Bone Metastases: Two Case Reports

Patients with advanced HR+/HER2- breast cancer often experience prolonged disease courses, with bone being a dominant site of metastasis. Bone-targeted agents (BTAs) are recommended to reduce the risk of skeletal-related events (SREs), yet most clinical trials report follow-up durations of less than 2 years. Here, we present two cases of patients with breast cancer and bone metastases who received continuous BTA therapy for 8 and 10 years, respectively, in the context of ongoing antitumor treatment. Neither patient developed SREs during follow-up. The two cases demonstrated good tolerabilit during long-term treatment, though broader conclusions regarding safety require further investigation.