We first evaluated whether FGFR4 is expressed in a panel of breast cancer cell lines consisting of basal-like breast cancer cells (MDA-MB-468, MDA-MB-231 and HCC1937), luminal-like breast cancer cells (T47D and MCF7), HER2 amplified breast cancer cells (SKBR3) and non-transformed breast myoepithelial cells (MCF10A and HMEC). This evidence concerns the gene ERBB2 and breast cancer.