CEACAM5 and gastric cancer: In the present study, CEA, CA72-4, and CA19-9 only performed moderately well in GC diagnosis, and their diagnostic sensitivities (61.07% for CEA, 45.04% for CA72-4, and 29.77% for CA19-9) were relatively lower than that of plasma TrxR activity (SEN: 85.50%) (Table 1).