Patient Derived Organoid-guided Personalized Treatment Versus Treatment of Physician's Choice in Breast Cancer

This multicenter, open-label, randomized phase III trial is designed to study the efficacy and safety of organoid-guided personalized treatment （OGPT）versus treatment of physician's choice (TPC) in previously treated refractory breast cancer. Molecular subtype, presence of visceral metastases, and number of prior chemotherapy treatments for advanced or metastatic disease will stratify randomization. subjects in the OGPT arm will receive the treatment predicted to be the most effective by PDO drug sensitivity screening, and subjects in the TPC arm will receive treatment of physician's choice. The primary population to be included in the study will be patients with refractory breast cancer who have received multiple lines of prior therapy and who have at least one measurable target lesion according to RECIST 1.1 criteria.