ADGRG2 and hepatocellular carcinoma: Furthermore, the Kaplan–Meier analysis indicated that a high ADGRG2 expression was strongly connected with lower OS (p = 0.024) (Figure 2A), and the value of ROC demonstrated that ADGRG2 may serve as a possible diagnostic biological marker for HCC, considering an area under the curve (AUC) of 0.637 (Figure 2B).