As shown in the upper panel of Figure 1, western blot studies of eight breast cancer cell lines showed that Sox2 is expressed in 3 of 3 ER+ cell lines (MCF7, ZR751 and BT474) as well as 2 of 4 TNBC cell lines (MDA-MB-231 and HCC1143). This evidence concerns the gene SOX2 and breast carcinoma.