Fig. 6From: Possible spontaneous regression of hepatocellular carcinoma with unique histopathological features confirmed by surgical resection: a case reportImmunohistochemical expression of programmed death 1 (PD-1) and programmed death-ligand 1 (PD-L1) in hepatocellular carcinoma (HCC). Lymphocytes infiltrating the tumor stroma were positive for PD-1. The expression of PD-L1 was observed in carcinoma cells and macrophages specifically within the lymphocyte-rich area of HCCBack to article page