SNAI1 and cancer: Of note, it is well known that Smail1 is aberrantly overexpressed in various types of malignant tumors including TNBC [40–43], overexpression of Snail triggers EMT [42, 44–47], carcinogenesis [48–51], and drug resistance [52, 53], and is closely associated with poor prognosis in cancer patients [40, 43, 46, 47, 50, 51].