CEACAM5 and breast cancer: The study of Nam SE et al. suggested no correlation between the levels of CEA, CA15-3, and OS of TNBC patients, while another research indicated that in basal-like subtype, which had an overlap of approximately 70–80% TNBC patients, elevated CEA conferred reduction for breast cancer-specific survival (BCSS), but without association observed for DFS [20, 38].