Title Search [BP SY 2-1] Definition and diagnosis of surgical margin in extrahepatic bile duct cancer Haeryoung KIM (Seoul National University, Korea) [BP SY 2-2] Extended surgery according to margin status on frozen section Michiaki UNNO (Tohoku University, Japan) [BP SY 2-3] Standard radical bile duct surgery focused on vascular reconstruction Shin HWANG (University of Ulsan, Korea) [BP SY 2-4] Case Discussion Huisong LEE (Ewha Womans University, Korea), Sae Byeol CHOI (Korea University, Korea) ()