RT Journal Article SR Electronic T1 Re-Evaluation of Prognostic Factors for Survival After Radiotherapy of Cerebral Gliomas: A Supplementary Analysis to a Previous Study JF Anticancer Research JO Anticancer Res FD International Institute of Anticancer Research SP 6513 OP 6515 DO 10.21873/anticanres.14674 VO 40 IS 11 A1 JASPAR WITTELER A1 TROELS W. KJAER A1 SOEREN TVILSTED A1 STEVEN E. SCHILD A1 DIRK RADES YR 2020 UL http://ar.iiarjournals.org/content/40/11/6513.abstract AB Background/Aim: Previously, we identified predictors of survival after irradiation of grade II-IV cerebral gliomas. In this supplementary analysis, survival was calculated in a more appropriate way than the original study. Patients and Methods: Ten factors were re-evaluated for survival in patients of the original study including pre-radiotherapy seizures. In the original study, survival was calculated from the end of the last radiotherapy course (primary or re-irradiation). After re-review, this approach was considered inappropriate. Survival should have always been calculated from the first radiotherapy course, as done in this supplementary analysis. Results: On multivariate analysis, WHO-grade II (p=0.006) and upfront resection (p=0.001) were associated with better survival. Unifocal glioma was significant on univariate analysis (p=0.001), where a trend could be identified for age ≤59 years (p=0.057) and seizures (p=0.060). Conclusion: The findings of this supplementary analysis regarding the identification of prognostic factors for survival agree with the results of the original study.