Postmastectomy radiation therapy for patients with pT1-2N1 breast cancer over 2 decades in Korea: Korean Radiation Oncology Group 14-21

PMRT was performed in approximately 10% of patients with pT1-2N1 breast cancer after mastectomy, with minimal changes in utilization rates over two decades. The use and extent of regional nodal irradiation has declined over time. Further research is needed to reflect the latest patterns of practice.