Stage II includes: IIA: T2a, N0, M0; IIB: T2b, N0, M0. T2a: Tumor invading the perimuscular connective tissue on the peritoneal side, without involvement of the serosa (visceral peritoneum). T2b: Tumor invading the perimuscular connective tissue on the hepatic side, with no extension into the liver. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 8th ed.) [from NCI]