Stage IIB includes: (T1, N1, M0); (T2, N1, M0); (T3, N1, M0). T1: Tumor confined to the bile duct histologically. T2: Tumor invades beyond the wall of the bile duct. T3: Tumor invades the gallbladder, pancreas, duodenum, or other adjacent organs without involvement of the celiac axis or the superior mesenteric artery. N1: Regional lymph node metastasis. M0: No distant metastasis. (from AJCC 7th Ed.) [from NCI]