This value is comparable to that of serum CEA (0.86) or KLK10 mRNA (0.89) and higher than that of CA19-9 (0.58) [19],[22], suggesting that Ct-OATP1B3 mRNA may possess the clinically useful level of diagnostic power necessary to discriminate between cancer and normal colon tissues. Here, CEACAM5 is linked to cancer.