CD4 and glioblastoma: Consistent with the IHC results, flow cytometry of GBM tissues showed that knocking down OSMR significantly increased the number of infiltrating T cells (Figure 8C,D), including total T cells (CD45+CD3+) (Figure 8E), T‐helper cells (CD45+CD3+CD4+CD8−) (Figure 8F), and cytotoxic T cells (CD45+CD3+CD4−CD8+) (Figure 8G).