IL15 and hepatocellular carcinoma: Another gene-modified NKs candidate, human interleukin-15 (hIL-15) gene-modified NKL cells (NKL-IL15), has been demonstrated to express high levels of cytolysis-related molecules (TNF-α, IFN-γ, NKp80 and so forth), which induces higher NKG2D ligand expression on target cells and results in increased susceptibility of HCC to NKs-mediated cytolysis [153].