KLRK1 and hepatocellular carcinoma: GPC3 expression on used HCC cell lines in our study was analyzed by flow cytometry (Figure 2B) and we also detected the HLA and NKG2D ligand expression on the HCC cell line Huh-7 (Figure S2) in order to prove that GPC3-Syn-NK92 cells may not be activated by these tumor characteristics.