Clinical efficacy and prognostic risk factors of endoscopic radiofrequency ablation for gastric low-grade intraepithelial neoplasia

Figure 1 Flowchart of the patients enrolled in this study. RFA: Radiofrequency ablation; APC: Argon plasma coagulation; EMR: Endoscopic mucosal resection; ESD: Endoscopic submucosal dissection.

Figure 2 The radiofrequency ablation procedure of gastric low-grade intraepithelial neoplasia. A: White-light imaging of the lesion (reversed view); B: Magnifying endoscopy with narrow-band imaging of the lesion (weak magnification); C: Magnifying endoscopy with narrow-band imaging of the lesion (strong magnification); D: After ablation, the surface of the lesions showed white coagulation and necrosis; E: Radiofrequency ablation for the same area was repeated three times; F: After scraping off the necrotic mucosal tissue on the surface.

Figure 3 Relapse-free survival curves. A: Non-Helicobacter pylori (H. pylori) infection vs H. pylori infection (P < 0.001); B: Disease course less than 1 year vs disease course over 1 year (P = 0.013). RFS: Relapse-free survival.