IFNG and neoplasm: Indeed, when these cells were co‐cultured with activated NK cells in a 4 h CFSE‐based killing assay, we found that the dual blockade with mAbs directed to NKG2A on the NK side and to Qa‐1b on the tumor side increased the killing of IFNγ‐pretreated tumor cells as compared to isotype‐matched control antibodies.