To visually confirm and elucidate the expression and distribution of CCNE1 in TNBC, hematoxylin and eosin (HE) staining and immunohistochemical (IHC) staining were conducted on tissue microarray chips comprising normal tissues (n = 35) and tumor tissues (n = 33) from TNBC patients. The gene discussed is CCNE1; the disease is neoplasm.