Submucosal Invasive Depth Predicts Lymph Node Metastasis and Poor Prognosis in Submucosal Invasive Esophageal Squamous Cell Carcinoma.

Abstract

Lymph node metastasis (LNM) in submucosal invasive esophageal squamous cell carcinoma (SM-ESCC) is a prognostic factor. The aim of this study was to identify a histopathologic predictor of LNM in SM-ESCC. In total, 108 patients who underwent an esophagectomy and lymph node dissection without preoperative therapy and who were pathologically diagnosed with SM-ESCC were enrolled in this study. Relationships between several clinicopathologic factors and LNM were examined. A multivariate analysis revealed that a tumor size of 35 mm or more (P = .0025), submucosal invasive depth (SID) of 2,000 μm or more (P = .013), and lymphatic infiltration (P < .0001) were significant independent predictors of LNM. In addition, there were significant differences in recurrence-free survival curves between patients with SID less than 2,000 μm or not (P = .029) and tumor size less than 35 mm or not (P = .049). This study suggests that SID may predict not only LNM but also poor prognosis.