GPD2 and medulloblastoma: We consulted the Affymetrix Human Gene 1.1 ST array profiling of 763 primary medulloblastoma samples (GSE85217) [19], which showed that GPD2 gene expression, encoding mGPDH, and MDH2, encoding mitochondrial malate dehydrogenase (MDH2), were different between the four groups (Fig. 1B).