A definitive diagnosis of glioblastoma relies on at least one of these molecular criteria: Telomerase Reverse Transcriptase (TERT) promoter mutation, Epidermal Growth Factor Receptor (EGFR) gene amplification and +7/−10 chromosome copy‐number alterations.[16, 17, 18] Detecting these markers requires specialized assays, which are not always available in routine hospital settings. This evidence concerns the gene TERT and glioblastoma.