To determine the roles of PD‐L1 in T‐cell activation, T cells were separated from healthy donors (HDs) and stimulated with Cell Stimulation Cocktail and cocultured with either siPD‐L1‐ or siPD‐L1‐NC‐transfected NF2‐associated meningioma cells. This evidence concerns the gene NF2 and meningioma.