label: Stage IA Esophageal Cancer AJCC v7
label_lc: stage ia esophageal cancer ajcc v7
description: Stage IA includes: For squamous cell carcinoma: T1, N0, M0, G1, GX, Tumor location: Any. T1: Tumor invades lamina propria, muscularis mucosae, or submucosa.  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.  For adenocarcinoma: T1, N0, M0, G1-2, X. T1: Tumor invades lamina propria, muscularis mucosae, or submucosa.  N0: No regional lymph node metastasis.  M0: No distant metastasis.  G1: Well differentiated.  G2: Moderately differentiated. GX: Grade cannot be assessed-stage grouping as G1. (AJCC 7th ed.)