CEACAM5 and gastric cancer: Many markers, including CEA, CK20, CK19, MAGE, and MMP-7, have previously been applied to detect micrometastases of gastric cancer (Okami et al, 2000; Yonemura et al, 2001; Kodera et al, 2002; Lin et al, 2002; Matsuda et al, 2004; Arigami et al, 2006; Horibe et al, 2007).