A total of 55 HCC patients and 20 aged and sex match controls were tested PMN-MDSC (HLA-DR−/low CD11b+CD33+CD14−CD15+), M-MDSC (HLA-DR−/low CD11b+CD33+CD14+CD15−) level in peripheral blood mononuclear cells (PBMCs) [13] Figure 1A. Here, CD33 is linked to hepatocellular carcinoma.