Predictive factors of submucosal fibrosis before endoscopic submucosal dissection for superficial squamous esophageal neoplasia.

Objectives: Endoscopic submucosal dissection (ESD) is an effective treatment modality for superficial squamous esophageal neoplasia (SSEN). However, submucosal fibrosis is an important obstacle to successful ESD. The aim of this study was to determine the ESD outcome in relationship to the degree of submucosal fibrosis of SSEN and to identify factors for predicting submucosal fibrosis.

Methods: We retrospectively analyzed endoscopic and pathologic factors related to submucosal fibrosis in 41 patients with SSEN who underwent ESD. Also, en bloc resection rate, complication rate, and procedure time according to the degree of submucosal fibrosis were evaluated. Masson's trichrome staining was used to evaluate histologic submucosal fibrosis.

Results: A depressed type tumor (vs. nondepressed type tumor, P = 0.002), length of tumor greater than 20 mm (vs. length of tumor ≤ 20 mm, P = 0.036), and delayed ESD after initial biopsy (vs. immediate ESD after initial biopsy, P = 0.005) were independent factors predictive of submucosal fibrosis. The severity of submucosal fibrosis was significantly associated with a higher complication rate such as bleeding and perforation. Also, as the severity of the submucosal fibrosis increased, the amount of time required for the ESD procedure increased.

Conclusions: Length of tumor greater than 20 mm and endoscopic depressed type are endoscopic predictive factors of submucosal fibrosis in SSEN. Moreover, to avoid submucosal fibrosis, ESD should be attempted immediately after biopsy for the diagnosis of SSEN.