HLA-G and hepatocellular carcinoma: The relative PSMD1 mRNA expression (PSMD1/β2-microglobulin) was significantly higher in hepatocellular carcinoma tissues (n = 23, 3.81 ± 4.36) compared with that of the corresponding normal tissues (n = 8, 1.10 ± 1.23; p = 0.012) (Fig. 1c).