IDH1 and glioblastoma: Previous genomics study has revealed that IDH1 mutations are much more common in younger GBM patients.3 A high‐resolution gene expression analysis has demonstrated that pediatric and adult high‐grade glioma are clearly distinguished by the absence of IDH1 hotspot mutations.39 Our result showed that age was selected by the combined model as a predictor of IDH1 mutations, reflecting the previous observations.