Furthermore, we evaluated the relationship of KDR amplification and survival in GBM IDH-WT, utilizing the data of a published study that evaluated KDR amplification through fluorescence in situ hybridization (FISH).20 In this dataset, 19 of 142 (13%) GBM IDH-WT tumors had KDR amplification. The gene discussed is IDH1; the disease is glioblastoma.