BACKGROUND/OBJECTIVES: Although METHODS: Patients who underwent RESULTS: The GC group was older than the non-GC group at the time of eradication, had lower serum pepsinogen I/II levels, had severe endoscopic atrophic changes, had higher activity at the antrum, and inflammation and intestinal metaplasia (IM) at the corpus on updated Sydney system scoring. On long-term follow-up after eradication, the GC group had a wider range of endoscopic mucosal atrophy and a lower serum pepsinogen I/II ratio at any time point. CONCLUSIONS: Endoscopic mucosal atrophy and the serum pepsinogen I/II ratio are useful predictors of GC in patients post