UNITy-BasED MR-Linac Adaptive Simultaneous Integrated Hypofractionated Boost Trial for High Grade Glioma in the Elderly

Concurrent chemoradiation with temozolomide (TMZ) over 3 weeks (40 Gy in 15 fractions). The gross tumor volume (GTV) plus margin will be boosted simultaneously (SIB) to 52.5 Gy in 15 fractions. Radiation will be delivered on the MR-Linac with a reduced clinical target volume (CTV) margin of minimum 5 mm and a weekly online adaptive approach.