In GBM, significant and weak correlations were confirmed for CD4 with CD8A (r = 0.32, p < 0.001), CD4 with CD8B (r = 0.38, p < 0.001), CD8A with SDC1 (r = 0.25, p = 0.0016), CD4 with MS4A1 (r = 0.31, p < 0.001), CD4 with SDC1 (r = 0.22, p = 0.005), TGM2 with MGMT (r = 0.23, p = 0.004), CD3D with TGM2 (r = 0.29, p < 0.001), CD3E with TGM2 (r = 0.38, p < 0.001), and CD3G with TGM2 (r = 0.35, p < 0.001). The gene discussed is CD8A; the disease is glioblastoma.