Collectively, the evidence shows that nine genes (CST6, TRIM29, CSTA, KRT15, KLK7, MME, CXCL13, FA2H, and HRNR) negatively impact BC, while five genes (FABP4, AQP3, KRT16, SERPINB3, and ATP6V1C2) are likely to facilitate BC (Table 1). This evidence concerns the gene KRT15 and breast cancer.