CEACAM8 and cancer: Different members of the CEACAM family have different special activities as well as their own expression patterns on normal and cancer tissues.31, 32 Ghazanfari et al. and Shin et al. reported that the CD66 is a positive marker for MSC.29 The exact type of CD66 was not determined and they used antibodies against CD66 that identify antigens from this CEACAM family of proteins, but we used antibody against CD66b.