Focusing on KIR-HLA genotype multiplicity, a high NK-licensing genotype, defined as possession of more than three functional compound genotypes, which have been proven to have an impact on HCC recurrence after primary hepatectomy [15], was found in 26.0% and 28.6% of recipients and donors, respectively (Table 1). Here, KIR3DL1 is linked to hepatocellular carcinoma.