In a study with invasive ductal carcinoma (IDC) cell lines MCF-7 and MDA-MB-231, Silva et al. [56] reported transcript expression of SOX3 and cytoplasmic localization of SOX3 in MCF-7 cells characterized as an epithelial-like cell and luminal A molecular subtype. The gene discussed is SOX3; the disease is invasive ductal breast carcinoma.