label: Stage 0 Esophageal Squamous Cell Carcinoma AJCC v7
label_lc: stage 0 esophageal squamous cell carcinoma ajcc v7
description: Stage 0 includes: Tis (HGD), N0, M0, G1, GX, Tumor location: Any.  Tis: High-grade dysplasia.  N0: No regional lymph node metastasis.  M0: No distant metastasis.  G1: Well differentiated.  GX: Grade cannot be assessed-stage grouping as G1.  Tumor location: Location of the primary cancer site is defined by the position of the upper (proximal) edge of the tumor in the esophagus.  (AJCC 7th ed.)