ZEB1 and hepatocellular carcinoma: Among them, Kurahara et al. [34] reported prognostic value of ZEB1 and ZEB2 in pancreatic cancer within 1 article; Okugawa et al. provided prognostic value of ZEB1 [24] and ZEB2 [36] in gastric cancer in 2 articles, which originated from the same cohort; Xia et al. [42] used 2 independent cohort (cohort I and cohort II) to investigate whether ZEB2 expression could predict survival of patients with hepatocellular carcinoma.