Although EZH2 was endogenously highly expressed in various BC cell lines (Figure S6D), ChIP‐qPCR assay using the same primers containing Snail1‐binding sites showed the recruitment of EZH2 to the miRNAsTGFβ2 promoters in TNBC cells and TNBC tissues (Figure S6E). This evidence concerns the gene SNAI1 and breast cancer.