Outcomes of robotic liver resection and intraoperative radiofrequency ablation for hepatocellular carcinoma in posterior segments VII and VIII

Figure 4 Subgroup analysis of overall survival. A-C: Within the robotic liver resection group in the de novo group prior to propensity score matching. Patients were stratified into high-risk and low-risk groups based on gender, major tumor size, and aggregate tumor size - variables identified as significantly associated with survival outcomes; D and E: Within the robotic intraoperative radiofrequency ablation group in first recurrence group after propensity score matching. Patients were stratified into high-risk and low-risk groups based on aggregate tumor size and complication or not - variables identified as significantly associated with survival outcomes. OS: Overall survival; RFS: Recurrence-free survival; R-LR: Robotic liver resection; RIO-RFA: Robotic intraoperative radiofrequency ablation.