Stage III includes: IIIA (T1-2, N2, M0, Any G); (T3, N1, M0, Any G); (T4a, N0, M0, Any G); IIIB (T3, N2, M0, Any G); IIIC (T4a, N1-2, M0, Any G); (T4b, Any N, M0, Any G); (Any T, N3, M0, Any G). T1: Tumor invades lamina propria, muscularis mucosae, or submucosa. T2: Tumor invades muscularis propria. T3: Tumor invades adventitia. T4a: Resectable tumor invading pleura, pericardium, or diaphragm. T4b: Unresectable tumor invading other adjacent structures, such as aorta, vertebral body, trachea, etc. N0: No regional lymph node metastasis. N1: Metastasis in 1-2 regional lymph nodes. N2: Metastasis in 3-6 regional lymph nodes. N3: Metastasis in seven or more regional lymph nodes. M0: No distant metastasis. (AJCC 7th ed.) [from NCI]