Stage 0 Esophageal Cancer AJCC v7

**Semantic type:** Neoplastic Process

**Definition:** Stage 0 includes: For squamous cell carcinoma: Tis (HGD), N0, M0, G1, GX, Tumor location: Any. For adenocarcinoma: Tis (HGD), N0, M0, G1, GX. 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.)

**Synonyms:** - Carcinoma in situ of esophagus - Esophageal Carcinoma in situ AJCC v7 - Severe Esophageal Dysplasia AJCC v7 - Stage 0 Esophageal Cancer - Stage 0 Esophageal Cancer - stage 0 esophageal carcinoma in situ