Efficacy and safety of endoscopic submucosal tunnel dissection for superficial esophageal squamous cell carcinoma: a propensity score matching analysis: methodologic issues

We read the valuable article by Huang and colleagues1 published in Gastrointestinal Endoscopy in 2017 with great interest. The authors' purpose was to assess the efficacy of the tunnel technique in endoscopic submucosal dissection (ESD) of superficial esophageal squamous cell carcinoma. They found that the ESD procedure time was significantly shorter in the tunnel ESD group than in the conventional ESD group. Also, they found that specimen size smaller than 40 mm was significantly and strongly associated with shorter procedure times both in the univariate model (odds ratio [OR], 19.25; 95% confidence interval [CI], 2.18-169.78) and the multivariate model (OR, 8.74; 95% CI, 1.30-58.5).

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