ZEB1 and neoplasm: In contrast, all seven EGFR-mutated tumours had lower ZEB1 (Fig. 1) and the levels of ZEB1 were significantly lower in EGFR mutant tumours than that in EGFR wild-type tumours (Student's t-test P=0.027) or in KRAS mutant tumours (Student's t-test P=0.013).