Predictors of Long-Term Outcomes of Video-Laparoscopic Versus Open Surgery in Obese Patients with Colorectal Cancer: A Propensity Score Matching Study

SIMPLE SUMMARY: Reducing invasiveness in colorectal surgery settings offers advantages, especially in patients with obesity. This study aimed to fill the exploratory window on the long-term oncological safety of the video-laparoscopic versus open colorectal surgical approach in obesity. A retrospective analysis of a surgical database of 138 colorectal cancer patients was performed by applying propensity score matching as a way to reduce selection bias. Overall survival and cancer-free survival were chosen as the primary long-term outcomes to compare open and video-laparoscopic surgical approaches, in order to enrich the body of evidence on the topic and provide greater confidence in clinical settings. ABSTRACT: Background: Minimally invasive methods in colorectal surgery offer unquestionable advantages, especially in the context of obesity. The current study addresses the lack of scientific evidence on the long-term oncologic safety of video-laparoscopic (VL) approaches in excess-weight CRC patients undergoing surgery. Methods: We retrospectively analyzed a surgical database consisting of 138 CRC patients undergoing VL (n = 87, 63%) and open CRC surgery (n = 51, 37%). To reduce selection bias, a propensity score matching was applied as a preliminary step to balance the comparison between the two surgery groups, i.e., VL and open surgery. Data from patients treated by the same surgeon were used.to minimize bias. Additional Cox regression models were run on the matched sample (N = 98) to explore the observed benefits of VL surgery in terms of overall and cancer-free survival. The nonparametric Kaplan-Meier method was used to compare the two surgical approaches and assess the likelihood of survival and cancer relapse. Results: The study sample was mostly male (N = 86, 62.3%), and VL outnumbered open surgery (63% versus 37%). Both before and after the matching, the VL-allocated group showed better overall survival (p < 0.01) with comparable cancer-free survival over more than five years of median observation time (66 months). Kaplan Meier survival probability curves corroborated the VL significant protective effect on survival (HR of 0.32; 95% CI: 0.13 to 0.81) even after adjusting for major confounding factors (age, gender, comorbidity index, BMI, tumor localization, tumor staging, tumor grading, clearance, CRM). Findings on oncologic performance by tumor relapse were comparable but lacked significance due to the small number of events observed. Conclusions: Comparing CRC surgical approaches, VL allocation showed comparable cancer-free survival but also a better performance on overall mortality than open surgery over more than five years of median observation.