Clinical Stage IVA Gastroesophageal Junction Adenocarcinoma AJCC v8

**Semantic type:** Neoplastic Process

**Definition:** Stage IVA includes: (T1-4a, N2, M0); (T4b, N0-2, M0); (Any T, N3, M0). T1: Tumor invades the lamina propria, muscularis mucosae, or submucosa. T2: Tumor invades the muscularis propria. T3: Tumor invades adventitia. T4a: Tumor invades the pleura, pericardium, azygos vein, diaphragm, or peritoneum. T4b: Tumor invades other adjacent structures, such as the aorta, vertebral body, or airway. N0: No regional lymph node metastasis. N1: Tumor with metastasis in one or two regional lymph nodes. N2: Tumor with metastasis in three to six regional lymph nodes. N3: Tumor with metastasis in seven or more regional lymph nodes. M0: No distant metastasis. (AJCC 8th ed.)