The expression levels of E-cadherin, vimentin, DDR1, DDR2, α2 integrin, α11 integrin, COL1A1, MT1-MMP, BIK, estrogen receptor α, progesterone receptor, and HER2 mRNAs in 58 breast cancer cell lines were analyzed in silico, by using the Broad-Novartis Cancer Cell Line Encyclopedia (CCLE) database. This evidence concerns the gene ERBB2 and breast cancer.