S100A8 and chronic atrophic gastritis: Followup endoscopic studies on corpus atrophy-negative H. pylori-positive patients after a time span of 11 years reported 62% of CagA IgG seropositive subjects (n = 24) had developed atrophic gastritis versus 32% of H. pylori-positive CagA IgG seronegative subjects (n = 34) (OR = 3.48; 95% CI: 1.02–12.18) [52].