Key factors influencing glioblastoma prognosis include patient age at surgery, KPS at admission, the extent of tumor resection in terms of STR and GTR, MGMT promoter methylation status und IDH-status (Li et al. 2016; McGirt et al. 2009; Radke et al. 2019; Smrdel et al. 2016). This evidence concerns the gene IDH2 and glioblastoma.