ESRP1 and breast cancer: On the other hand, the re-expression of ESRP1 and ESRP2 in an invasive BC cell line T24 rendered the cells from mesenchymal-like to epithelial-like, decreased cell growth potential and decreased cell invasiveness, also likely through a substantial switch of the FGFR2 pre-mRNA from the mesenchymal IIIc isoform to the epithelial IIIb isoform.