For instance, five characteristic genes, cyclin-dependent kinase 1 (CDK1), EZH2, cyclin B1 (CCNB1), cyclin A2 (CCNA2), and Aurora kinase A (AURKA), were evaluated according to the stemness traits of tumor cells in triple-negative breast cancer (TNBC) and may serve as prognostic indicators or therapeutic targets [29]. The gene discussed is CCNA2; the disease is neoplasm.