Levano and colleagues [139] report that BLBC cell lines preferentially express molecules associated with tumor invasion and metastasis in response to macrophage-derived cytokines, such as hepatocyte growth factor receptor (HGFR), CD44, epithelial growth factor receptor (EGFR), oncostatin M receptor (OSMR) and transforming growth factor receptor 2 (TGFBR2), when compared to luminal cell lines. This evidence concerns the gene CD44 and neoplasm.