Title Search [LV OP 1-1] Comparative long-term outcomes of minimal invasive treatment including laparoscopic liver resection and radiofrequency ablation for hepatocellular carcinoma Sungho KIM (Seoul National University Bundang Hospital, Korea) [LV OP 1-2] Comparative study of laparoscopic liver resection and open liver resection in patients over 70 years of age Hwui-Dong CHO (Asan Medical Center, Korea) [LV OP 1-3] The adequate resection margin of hepatocellular carcinoma according to the tumor microenvironment Sung Hoon KIM (Yonsei University Wonju College of Medicine, Wonju Severance Christian Hospital, Korea) [LV OP 1-4] Risk factors, patterns, and outcomes of late recurrence after liver resection for patients with hepatocellular carcinoma (Analysis of a multicenter cohort over 15 years) Tian YANG (Eastern Hepatobiliary Surgery Hospital of Second Military Medical University, China) [LV OP 1-5] Feasibility and safety of bisegmentectomy 7-8 preserving hepatic venous outflow Hye-Sung JO (Korea University College of Medicine, Korea) [LV OP 1-6] Recurred colorectal liver metastasis following initial hepatectomy: Is repeat hepatectomy justified? Jangho PARK (National Cancer Center, Korea) [LV OP 1-7] Quantitative assessment of liver fibrosis using shore durometer Young Chul YOON (Incheon St.Mary's Hospital, The Catholic Univeristy of Korea, Korea)