OLIG2 and neoplasm: EGFR and IDH1 were highly expressed in tumor cells, FAP and COL1A1 were confined to fibroblasts, CD68 and ITGAM marked macrophages, PECAM1 and CDH5 identified endothelial cells, OLIG2 and MOG were specific to oligodendrocytes, while CD4 and CD3D defined T-cell subsets.