Furthermore, by combining CTSH expression and its downstream targets expressions (i.e., CTSH combined with PFKL, PKM, LDHA, HK2; and low IDH, MPC1, AIFM1, and HTRA2 combined with high CTSH expression), we found a remarkably significant facilitation of tumorigenesis and poor prognosis in HCC (Figure 6e) (Kaplan–Meier plotter). This evidence concerns the gene HK2 and hepatocellular carcinoma.