Pathologic Stage 0 Gastroesophageal Junction Adenocarcinoma AJCC v8

**Semantic type:** Neoplastic Process

**Definition:** Stage 0 includes: Tis, N0, M0, GN/A. Tis: High-grade dysplasia, defined as malignant cells confined to the epithelium by the basement membrane. N0: No regional lymph node metastasis. M0: No distant metastasis. GN/A: Grade non-applicable. (AJCC 8th ed.)