Each HCC patient was assigned with a risk score in terms of the expression of ABCC1, ABCC4, ABCC5, and ABCC6. In the prognostic signature built for the TCGA database, the risk score for each patient was displayed in the upper scatter plot, and the patients were divided into two groups based on the median value (Figure 5E). The gene discussed is ABCC4; the disease is hepatocellular carcinoma.