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Anti-programmed cell death-1 (PD-1) antibodies has been approved to treat HCC. Some PD-1 ligands (PD–L1 and PD–L2) negative tumors respond to treatment of anti-PD-1 antibodies, and this fact may be caused by the expression of PD-1 ligands on non-tumor cells. PD–L1 was recently found to be expressed on CD14 +  cells from cancer patients. We investigate PD-1 ligands expression on CD14 +  cells of patients with HCC and the role of CD14 +  cells in an antitumor response. In this study, 87 patients diagnosed with HCC were enrolled. CD14 +  cells from patients with HCC expressed PD–L1 (4.5–95.5%) and PD–L2 (0.2–95.0%). According to cut-off values, we classified patients as those either with PD–L1 + PD–L2 + CD14 +  cells or other types of CD14 +  cells. The overall survival of patients with PD–L1 + PD–L2 + CD14 +  cells was shorter than that of patients with other types of CD14 +  cells ( p  = 0.0023). PD–L1 + PD–L2 + CD14 +  cells produced IL-10 and CCL1, and showed little tumoricidal activity against HepG2 cells. The tumoricidal activity of CD8 +  cells from patients with PD–L1 + PD–L2 + CD14 +  cells were suppressed by co-cultivation with CD14 +  cells from the syngeneic patient. Furthermore, anti-PD-1 antibody restored their tumoricidal activity of CD8 +  cells. In conclusion, some patients with HCC have PD–L1 + PD–L2 + CD14 +  cells that suppress their antitumor response. These inhibitory functions of CD14 +  cells may be associated with a poor prognosis in these patients.

Increased both PD–L1 and PD–L2 expressions on monocytes of patients with hepatocellular carcinoma was associated with a poor prognosis