CEACAM5 is a cell surface glycoprotein that is overexpressed in a variety of human tumors, including pancreatic cancers, breast cancers, lung cancer, and neuro-endocrine prostate cancer (NEPC) (14–16) and has been functionally associated with tumor differentiation, invasion, and metastasis (17–19). The gene discussed is CEACAM5; the disease is neoplasm.