VIPR1 and hepatocellular carcinoma: In addition, the expression of VIPR1 in HCC was positively correlated with the levels of T cell gamma delta (0.33), T cell CD4 memory resting (0.25), macrophages M2 (0.2), and monocytes (0.2), while the expression of VIPR1 was negatively correlated with macrophages M0 (0.41), NK cells activated (0.29), T cell regulatory (Tregs), and T cell follicular helper (0.23).