TNF and neoplasm: The MSLN CAR‐iNK cells also displayed higher expression levels of IFN‐γ, TNF‐α, and CD107a than iNK cells after stimulation with tumour cells, which is consistent with previous studies that CAR‐NK cells upregulate the expression levels of CD107a, IFN‐γ, and TNF‐α on conditions of stimulation by target cells.8, 26