The BMP4 expression was significantly different for different TCGA and CGGA subtypes and IDH1 mutation status. A, D, G and H showed BMP4 had a Proneural preference. B, E and I showed BMP4 had a G1 preference. C and F showed that patients with IDH1 gene mutation also showed higher expression of BMP4 than those with wild-type IDH1 gene. A single spot was the expression value of BMP4 of an individual patient. Lines in the middle were the mean expression value.