Stage IV includes: IVA: (T4a, N2, M0, Any G, Tumor location: Any); (T4b, N0-2, M0, Any G, Tumor location: Any); (Any T, N3, M0, Any G, Tumor location: Any); IVB: (Any T, Any N, M1, Any G, Tumor location: Any). 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. M1: Distant metastasis. (AJCC 8th ed.) [from NCI]