We also analyzed the microarray data of human breast cancer cell lines from the Cancer Cell Line Encyclopedia (CCLE) and found that the mesenchymal subtypes of human breast cancer cell lines47–50 showed higher expression levels of BMP-4, Jagged-1, Hey1, CD44, and Slug than the luminal subtypes (Supplementary Fig. 12). This evidence concerns the gene SNAI2 and breast carcinoma.