CD4 and central nervous system cancer: reported decreased expression of different immune cell‐related genes, including CD8 (CD8A), CD4, CD19, CD20 (MS4A1), CD11b (ITGAM), FOXP3, CD163, CD68, CD56 (NCAM1), and S100A4 in IDH‐mutant glioma datasets of TCGA (n = 390) and CGGA (n = 312).