A Prospective, Multicenter, Observational Cohort Study Assessing the Efficacy and Safety of Radiotherapy-sensitized Immunotherapy in Advanced Breast Cancer

Patients with advanced breast cancer who have already received and continue to use immunotherapy, or are planned to receive immunotherapy, and have been recommended for radiotherapy after evaluation by a multidisciplinary team (MDT) in the early stage and have completed radiotherapy, are registered and followed up in this study.