CEACAM5 and neoplasm: Of the 90 patients with available tumor marker data, 47 patients (52.2%) showed an isolated elevation of CA19-9, 3 patients (3.3%) an isolated elevation of CEA and 17 patients (18.9%) showed an elevation of both markers, while 23 patients (25.6%) did not display elevated levels of tumor markers when applying our laboratory’s standard cut-off values (CEA: 5 μg/l, CA19-9: 34 U/ml) (Fig. 1c).