Stage IIB includes: (T3, N0, M0); (T4a, N0, M0). T3: Tumor penetrates the subserosal connective tissue without invasion of the visceral peritoneum or adjacent structures. T4a: Tumor invades the serosa (visceral peritoneum). N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 8th ed.) [from NCI]