CEACAM5 and colon adenocarcinoma: Much larger amounts of CEACAM6 were found in colon adenocarcinoma (6.2 ± 1.4) compared with non-neoplastic colon (3.0 ± 0.0; P < 0.002) and CEACAM6 expression exceeded CEACAM5 expression (3.4 ± 0.5; P < 0.001).