CD226 and hepatocellular carcinoma: TIGIT, DNAM-1, TACTILE, PVRIG, and KIR2DL5A expressions were lower (Student t-test) in HCC than in NT (p = 5.4 × 10−3, p = 2.2 × 10−27, p = 2.5 × 10−15, p = 6.6 × 10−29, and p = 9.5 × 10−12, respectively) (Figure 2B).