Analysis of Oncological Outcomes After Robotic Liver Resection for Intrahepatic Cholangiocarcinoma.

ABSTRACT

BACKGROUND: Concerns regarding minimally invasive liver resection of intrahepatic cholangiocarcinoma (IHCC) include inadequate resection margins and inferior long-term overall survival (OS) when compared to an "open" approach. Limited data exists to address these issues. We aimed to compare perioperative variables, tumor distance to margin, and long-term outcomes after IHCC resection based on surgical approach (robotic vs open) in our hepatobiliary center to address these concerns. METHODS: With IRB approval, 34 patients who underwent robotic or open hepatectomy for IHCC were prospectively followed. Patients were stratified by tumor distance to resection margin (≤1 mm, 1.1-9.9 mm, ≥10 mm) for illustrative purposes and by approach (robotic vs open). Where appropriate, regression analysis and cox model of proportional hazards were utilized. Survival was stratified by margin distance and approach utilizing Kaplan-Meier curves. Data are presented as median (mean ± SD). RESULTS: Patients undergoing robotic vs open hepatectomy had similar demographics. Patients undergoing the robotic approach had significantly lower estimated blood loss (EBL). Tumor distance to margin between the two approaches were similar (P = .428). Median OS between the two approaches was similar in patients of any margin distance.In the subgroup analysis by margin distance, the robotic approach yielded less EBL for patients in the 1.1-9.9 mm and ≥10 mm margin groups, and a shorter ICU length of stay for patients with ≥10 mm margin. DISCUSSION: Similar margins were attained via either approach, translating into oncological non-inferiority of robotic IHCC resection. Robotic approach for the treatment of IHCC should be considered an alternative to an open approach.