IDH1 and glioblastoma: Differential expression analysis stratified for IDH1 mutations showed that IDH1-mutant GBM had significantly lower CDH2, LEF1, and SNAI1 expression, and higher ZEB1. Gene expression in different GBM subtypes showed that the TJP1/ZO1 gene was associated with the classical subtype, while ZEB2 was associated with the proneural subtype.