ZEB1 and neoplasm: A Kaplan-Meier analysis comparing patients with Zeb1/δEF1 expression values either above or below the mean Zeb1/δEF1 expression value (Figure 6D) revealed that patients with tumours exhibiting lower Zeb1/δEF1 expression had a higher rate of disease recurrence (two-tailed Gehan-Breslow-Wilcoxon test, p = 0.004).