NCIt related terms : Stage IVA Gallbladder Cancer;
NCIt definition : Stage IVA includes: T4, N0-1, M0. T4: Tumor invading the main portal vein or hepatic
artery or invading two or more extrahepatic organs or structures. N0: No regional
lymph node metastasis. N1: Metastases to one to three regional lymph nodes. M0: No
distant metastasis. (AJCC 8th ed.);