CD4 and glioblastoma: The result showed that GPX8 expression was positively correlated with infiltration of CD8+ T cells (rho = 0.237, p = 5.29e-03), CD4+ T cells (rho = 0.224, p = 2.54e-03), monocytes (rho = 0.349, p = 2.87e-05), neutrophils (rho = 0.222, p = 9.23e-03), myeloid dendritic cells (rho = 0.352, p = 2.51e-05), macrophages (rho = 0.173, p = 3.91e-02), and tumor-associated fibroblasts (rho = 0.582, p = 4.80e-14), and negatively correlated with plasma cell (rho = −0.292, p = 5.44e-04) infiltration in the GBM microenvironment (Figure 6B).