Moreover, Sellapan and colleagues demonstrated that MDA-MB-435 cells express mammary specific proteins such as β-casein, α-lactalbumin, EMA, keratin-19 and even milk lipids upon β-Heregulin stimulation, which is indicative for breast cancer cells like MDA-MB-231, SUM1315 or HBL100 rather than for melanoma cells [46]. Here, KRT19 is linked to breast cancer.