IDO1 and hepatocellular carcinoma: We found a positive correlation between interferon-γ (IFN-γ) and CD47 in HCC cells (Figure 1B), IFN-γ, PBMCs, and IDO1 could increase the expression of CD47 in HepG2 cells, while Abrine decreased the expression of CD47 (Figures 4A–C).