Stage III includes: (T3, N1, N2, or N3, M0); (T4a, N1, N2, or N3, M0). T3: Tumor penetrates the subserosal connective tissue without invasion of the visceral peritoneum or adjacent structures. T4a: Tumor invades the serosa (visceral peritoneum). 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.) [from NCI]