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Abstract
Introduction/Background The main objective was to analyze the rate of bilateral sentinel lymph node (SLN) detection in endometrial cancer using indocyanine green (ICG) as a unique tracer compared to Technetium99 + ICG. As secondary objectives, we analyzed the drainage pattern and factors that might affect the oncological outcomes.
Methodology A case-control ambispective study was carried out on consecutive patients at our center. Data on the SLN biopsy with ICG collected prospectively were compared to retrospective data on the use of a double-tracer technique including Technetium99 + ICG. In total, 194 patients were enrolled and assigned to both groups, in which the group with both tracers (controls) included 107 (54.9%) patients and the ICG-alone group (cases) included 87 (45.1%) patients.
Results The rate of bilateral drainage was significantly higher in the ICG group (98.9% vs. 89.7%; p = 0.013). The median number of nodes retrieved was higher in the control group (three vs. two nodes; p < 0.01). We did not find survival differences associated with the tracer used (p = 0.85). We showed significant differences in terms of disease-free survival regarding the SLN location (p < 0.01), and obturator fossa retrieved nodes showed better prognosis compared to external iliac.
Kaplan–Meier estimate. Disease-free survival comparing sentinel node location (FOB: Obturator Fossa; IL. EXT: External Iliac Artery). Log-rank test p < 0.01.
Conclusion The use of ICG as a single tracer for SLN detection in endometrial cancer patients seemed to obtain higher rates of bilateral detection with similar oncological outcomes.
Disclosures Conflicts of Interest: The authors declare no conflict of interest.
Funding This research received no external funding.
Institutional Review Board Statement The study was conducted in accordance with the Declaration of Helsinki and approved by the Ethics Committee of University Hospital La Paz (protocol code PI-3599 and approved on 7 May 2019).