Stage IIIC includes: (T4b, N2, M0); (T4b, N3, M0); (T4a, N3, M0). T4a: Tumor invades serosa (visceral peritoneum). T4b: Tumor invades adjacent structures. 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]