CD274 and hepatocellular carcinoma: An association was found between high CMTM6 expression and tumoral PD-L1 in the whole population (R2 = 0.006, P = 0.048) and in MTM-type HCC (R2 = 0.006, P = 0.050), but no significant association was found in non-MTM-type HCC (Fig. 3b).