Rizzo et al. reviewed the current literature of CA19‐9 and CEA levels in the diagnosis CCA and found that the sensitivity of these biomarkers were 77.14% and 68.57% respectively, with CA19‐9 having a false positive rate of 15.22% and CEA false positive rate of 18.48%.92 Here, CEACAM5 is linked to cholangiocarcinoma.