TGFB2 and glioblastoma: TGF-β2 mRNA levels were increased in mesenchymal and classical glioblastoma, compared with the two other subgroups (proneural p<0.001 and p<0.001, neural p=0.008 and p<0.001), whereas expression levels did not differ between mesenchymal and classical glioblastoma (p=0.515).