CEACAM5 and neoplasm: Similarly, the expression percentages of gastric cancer tumor markers evaluated by flow cytometry were higher for diffuse-subtype GC, 60% (CEA), and 54.5% (Ck7), and for the intestinal-subtype, they were 45.6% (CEA) and 62.2% (CA 19-9), when compared with the non-neoplastic surrounding tissue 7.7% (CEA) and 7.9% (Ck 7) (Fig 1C).