CD244 and hepatocellular carcinoma: The expression levels of inhibitory receptors ILT2, NKG2A, and CD47 on CD56dim NK cells were significantly higher in HCC patients than in HVs, while the expression levels of activating receptors Siglec-7, DNAM-1 (CD226), and 2B4 (CD244) were significantly lower (Figure 2B).