ABSTRACT
OBJECTIVES: The preventive effect of Helicobacter pylori (HP) eradication on metachronous gastric cancer development after endoscopic resection remains controversial. The aim of this study was to identify specific endoscopic features that correlated with the risk of metachronous gastric cancer development after endoscopic submucosal dissection (ESD) using both endoscopic findings before ESD and changes of findings after HP eradication. METHODS: This retrospective study investigated 122 consecutive patients who underwent ESD for early gastric cancer and successful HP eradication after ESD. Endoscopic findings linked with HP before ESD and changes after HP eradication were evaluated according to the development of metachronous cancer. RESULTS: Most patients showed severe atrophy and intestinal metaplasia (IM) before ESD (97% and 83%, respectively). Improvement of spotty redness, improvement of diffuse redness, emergence of patchy redness, and emergence of map-like redness were frequent findings after HP eradication (52%, 50%, 54%, and 32%, respectively). Kaplan-Meier curves indicated that patients without IM before ESD never developed metachronous cancer, while patients with emergence of map-like redness after HP eradication were significantly more likely to develop metachronous cancer (log-rank test, p = 0.031 and p < 0.001, respectively). Multivariate analysis indicated that emergence of map-like redness after HP eradication was the only predictive factor for development of metachronous cancer (hazard ratio, 3.61; 95% confidence interval, 1.41-9.21; p = 0.007). CONCLUSIONS: Absence of IM before ESD and emergence of map-like redness after HP eradication were useful endoscopic findings in the negative and positive prediction of metachronous gastric cancer developing after ESD.
