S100A8 and gastric cancer: Furthermore, when stratified against CagA seropositivity according to the antibody titer, HP‐infected subjects with low‐positive CagA titer (6.25–12.5 U/mL) had an increased risk of gastric cancer compared to HP‐negative subjects who were CagA negative (OR, 1.85; 95% CI: 1.38–2.48) (Table 2).