Narrower radiation field after brain tumor surgery aims to cut harm without sacrificing control

This study tests whether using a smaller radiation target area after glioblastoma surgery can still control the tumor while causing fewer side effects. About 79 adults aged 18-70 who had surgery for glioblastoma will receive radiation to a 1 cm margin around the original tumor, plus standard chemotherapy. The main goals are to see how many patients are alive without tumor growth at 6 months and how many develop serious brain damage from radiation.