Stage I Esophageal Squamous Cell Carcinoma AJCC v7

**Semantic type:** Neoplastic Process

**Definition:** Stage I includes: IA (T1, N0, M0, G1, GX, Tumor location: Any); IB (T1, N0, M0, G2-3, Tumor location: Any); (T2-3, N0, M0, G1, GX, Tumor location: Lower, X). T1: Tumor invades lamina propria, muscularis mucosae, or submucosa. T2: Tumor invades muscularis propria. T3: Tumor invades adventitia. N0: No regional lymph node metastasis. M0: No distant metastasis. G1: Well differentiated. GX: Grade cannot be assessed-stage grouping as G1. G2: Moderately differentiated. G3: Poorly differentiated. 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.)

**Synonyms:** - Esophageal Squamous Cell Carcinoma Stage I - Oesophageal Squamous Cell Carcinoma Stage I - Stage I Esophageal Squamous Cell Cancer - Stage I Esophageal Squamous Cell Carcinoma - Stage I Esophagus Squamous Cell Carcinoma - Stage I Squamous Cell Carcinoma of Esophagus - Stage I Squamous Cell Carcinoma of the Esophagus