Title Search [BP OP 1-S1] Role of Minimally Invasive Approach in Reoperation for Postoperatively Diagnosed T2 Gallbladder Cancer: a Multicenter Cohort Study Yeshong PARK (Seoul National University Bundang Hospital, Korea) [BP OP 1-S2] Clinicopathological Feature And Impact of Adjuvant Therapy in T1 Pancreatic Ductal Adenocarcinoma: a Single Institutional Retrospective Analysisture Soo Yeun LIM (Samsung Medical Center, Korea) [BP OP 1-S3] Minimally Invasive Pancreatoduodenectomy with Combined Venous Vascular Resection; a Comparative Analysis with Open Approach Seung Soo HONG (Severance Hospital, Korea) [BP OP 1-S4] Unresectable Pancreatic Cancer Is Not Always “Unresectable” in the Era of Multidisciplinary Treatment: Proposal of ABCD Criteria Atsushi OBA (Cancer Institute Hospital, Japanese Foundation for Cancer Research, Japan) [BP OP 1-S5] Exclusive Liver Invasion As a Better Prognostic Indicator in T3 Gallbladder Cancer Aram SHIN (Asan Medical Center, Korea) [BP OP 1-S6] Survival Benefit And Impact of Adjuvant Chemotherapy Following Systemic Neoadjuvant Chemotherapy in Patients with Resected Pancreas Ductal Adenocarcinoma Ning PU (Zhongshan Hospital, Fudan University, China) [BP OP 1-S7] Prognostic Impact of Immunohistochemical Expression of MUC in Curatively Resected Ampulla of Vater Cancer Byeong Gwan NOH (Pusan National University Hospital, Korea)