PIK3CA and glioblastoma: A total of 19 covariates can be downloaded from cBioPortal (http://www.cbioportal.org), including the patients' demographic variables (age, gender), trait‐related variables (Karnofsky score, months of disease‐specific survival, overall survival status, FLAIR volume, classical, mesenchymal, neural, proneural), and several genetic markers (EGFRmut, IDH1mut, DDIT3, EGFR, KIT, MDM4, PDGFRA, PIK3CA, PTEN) which have been considered important GBM driver genes.18