SNAI1 and neoplasm: In tumours, HIF‐1α promoted the expression of transforming growth factor (TGF)‐β, LOX, Snail, TWIST‐1, TCF‐3, ZEB1 (Zinc finger E‐box‐binding homeobox 1) and ZEB2, which then activated EMT and the metastasis of tumour cells 31, 32, 33, 34.