GPX4 and hepatocellular carcinoma: In agreement with our findings, studies with grade III HCC tissues (Guerriero et al., 2015), HepG2 cell lines (Guariniello et al., 2015; Zhao et al., 2015), and Huh7 cells (Guariniello et al., 2015) also revealed higher expression of GPX4 (Table 1).