IDH2 and central nervous system cancer: DNA-methylation analysis revealed glioblastoma, IDH-wildtype (v11b4 classifier score 0.93) and later, in the 12.5 classifier version, a diffuse paediatric-type high-grade glioma, H3-wildtype and IDH-wildtype (pHGG RTK2; 12.5 classifier score 1.0).