How long to do you wait after resection of GBM to start radiation?

This is a frequently asked question from patients and there are several large retrospective series examining the timing of adjuvant radiotherapy for glioblastoma. We looked at our own retrospective series https://www.ncbi.nlm.nih.gov/pubmed/26440447 and found that in general, starting radiotherapy within five to six weeks after surgery did not impact survival, taking into account significant covariates. Patients who started radiotherapy less than 3 weeks after surgery tended to have worse progno...