CD4 and meningioma: The percentages of CD4+CD69+ and CD8+CD69+ cells were analyzed, and the results showed that when T cells were cocultured with siPD‐L1‐transfected NF2‐associated meningioma cells, the expression of CD69 on both CD4+ and CD8+ T cells was partly reduced compared with that in the siPD‐L1‐NC group (Figure 3).