Because the CEACAM1 antibodies used in immunoblotting (Santa Cruz Biotechnology, clone E-1) and IHC (Abcam, clone EPR4049) only recognize the long isoforms of CEACAM1 while the CEACAM1 antibody used in flow cytometry (eBioscience, clone CD66a-B1.1) recognizes the ectodomain of CEACAM1, CEACAM3, CEACAM5, and CEACAM6, we further clarified which CEACAM members are expressed in MCL cells. The gene discussed is CEACAM5; the disease is mantle cell lymphoma.