IDH1 and glioblastoma: Expression of PDGFRA, a glioblastoma (GBM)‐associated gene [35], was observed to be lower in comparisons of both CIC‐KO to CIC‐WT cells and IDH1‐R132H to IDH1‐WT cells, indicating that both CIC loss and the expression of IDH1‐R132H independently resulted in reduced expression of PDGFRA (Figure 5B).