Title Search [LV OP 4-1] Validation of the alpha-fetoprotein model for hepatocellular carcinoma recurrence after transplantation in an asian population Jinsoo RHU (Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea) [LV OP 4-2] Comparison of pure laparoscopic and open living donor right hepatectomy after learning curve Boram LEE (Seoul National University Bundang Hospital, Korea) [LV OP 4-3] Pegylated interferon versus direct-acting antiviral agents pre-emptive treatment of HCV after living donor liver transplantation Jae Hyun KWON (Asan Medical Center, University of Ulsan College of Medicine, Korea) [LV OP 4-4] Totally laparoscopic living donor right hepatectomy in bile duct anomalies Young Seok HAN (Kyungpook National University School of Medicine, Kyungpook National University Hospital, Korea) [LV OP 4-5] T-cell exhaustion determined by PD-1 expression on tumor-infiltrating CD8 t-cells in HCC patients Shin HWANG (Asan Medical Center, University of Ulsan College of Medicine, Korea) [LV OP 4-6] A caudate branch as the anatomical landmark for optimal bile duct division during donor hepatectomy JAe Uk CHONG (Yonsei University College of Medicine, Korea) [LV OP 4-7] A novel thermal accelerant for augmentation of microwave energy during image-guided thermal ablation of tumors William PARK (The Warren Alpert Medical School, Rhode Island Hospital, USA)