In support of this hypothesis, we also observed that the expansion of MDSC4 in the blood of relapsing GBM correlated negatively with CD3+ (Figure 4H, R = −0.952, p = 0.0374) and CD4+ (Figure 4I, R = −0.929, p < 0.001) T cells infiltrating the TME. The gene discussed is CD4; the disease is glioblastoma.