FBXW7 and cholangiocarcinoma: To verify our observations and define the clinical significance of FBXW7 in CCA, immunohistochemical (IHC) staining was performed in a cohort of 160 CCA specimens (43 IHCC, 64 PHCC and 53 DCC), 28 of them with paired tumor adjacent nontumorous tissues (10 intrahepatic bile duct tissues, 10 perihilar bile duct tissues and 8 distal bile duct tissues).