Introduction
Accurate intraoperative tumor localization remains a critical challenge in laparoscopic intestinal surgery, particularly for early-stage lesions with subtle mucosal changes and advanced tumors with blurred margins due to surrounding infiltration. Traditional localization methods, including carbon nanoparticle labeling and manual palpation, often demonstrate insufficient precision and prolonged operative time. This prospective randomized controlled trial aims to evaluate the clinical efficacy and application value of a novel magnetic marker-assisted real-time navigation system compared to conventional localization techniques in laparoscopic precision resection of intestinal neoplasms across different disease stages.
Aims & Methods
A total of 240 patients with histologically confirmed intestinal neoplasms undergoing laparoscopic resection were enrolled from September 2023to December 2025. The cohort comprised 120 patients with early-stage tumors (Group E) and 120 patients with advanced-stage tumors (Group A). Each stage group was randomly stratified into three subgroups: magnetic marker navigation (n=40), carbon nanoparticle labeling (n=40), and unmarked controls (n=40). Preoperative endoscopic procedures in the magnetic marker groups involved trans-mucosal implantation of three ferromagnetic markers in an inverted triangular configuration at 1 cm intervals from both oral and anal tumor margins, with additional markers placed at suspected infiltration sites for advanced tumors, 24-48 hours prior to surgery. Intraoperative localization utilized dual-modality guidance combining endoscopic light source visualization with magnetic sensor detection to delineate resection boundaries. Primary endpoints included lesion localization time, R0 resection rate, operative duration, and postoperative complications.
Results
The magnetic marker navigation system demonstrated superior performance across all evaluated parameters. In early-stage tumors, the magnetic marker group achieved 100% R0 resection rate with significantly reduced localization time compared to carbon nanoparticle labeling (0.45 +/- 0.56 vs. 5.42 +/- 2.28 minutes, P < 0.001), while the control group showed 17.5% margin positivity requiring intraoperative frozen section-guided re-excision. Similarly, in advanced-stage tumors, the magnetic marker group achieved 97.5% R0 resection rate with localization time of 0.45 +/- 0.56 minutes compared to 5.42 +/- 2.28 minutes in the carbon nanoparticle group and 8.76 +/- 3.15 minutes in controls (P < 0.001). Total operative duration was reduced by 32.6% in the magnetic marker group versus controls (P < 0.01). Both marked groups exhibited significantly lower rates of positive surgical margins and postoperative complications compared to unmarked controls.
Conclusion
The proprietary magnetic marker-assisted real-time navigation system demonstrates significant advantages in localization precision, operative efficiency, and oncological outcomes for laparoscopic intestinal tumor resection across both early and advanced disease stages. This technology represents a technically superior alternative to traditional localization methods and has the potential to become a standard approach for precise tumor localization in minimally invasive gastrointestinal surgery.
