Role of ICG-99mTc-nanocolloid for sentinel lymph node detection in cervical cancer: a pilot study
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Sentinel lymph node biopsy (SLNB) can be used for nodal staging in early cervical cancer. For this purpose, the tracers most commonly used are radiotracers based on technetium. For the last decade, indocyanine green (ICG) has been used as a tracer for SLNB in other malignancies with excellent results and, more recently, a combination of ICG and a radiotracer has been shown to have the advantages of both tracers. The aim of this study was to evaluate the role of ICG-99mTc-nanocolloid in SLN detection in patients with cervical cancer.
This prospective study included 16 patients with cervical cancer. The hybrid tracer was injected the day (19–21 h) before surgery for planar and SPECT/CT lymphoscintigraphy. Blue dye was administered periorificially in 14 patients. SLNs were removed according to their distribution on lymphoscintigraphy and when radioactive, fluorescent and/or stained with blue dye. Nodal specimens were pathologically analysed for metastases including by immunochemistry.
Lymphoscintigraphy and SPECT/CT showed drainage in all patients. A total of 69 SLNs were removed, of which 66 were detected by their radioactivity signal and 67 by their fluorescence signal. Blue dye identified only 35 SLNs in 12 of the 14 patients (85.7%). All patients showed bilateral pelvic drainage. Micrometastases were diagnosed in two patients, and were the only lymphatic nodes involved.
SLNB with ICG-99mTc-nanocolloid is feasible and safe in patients with early cervical cancer. This hybrid tracer provided bilateral SLN detection in all patients and a higher detection rate than blue dye, so it could become an alternative to the combined technique.
KeywordsSentinel lymph node Cervical cancer Hybrid tracer Indocyanine green 99mTc-Nanocolloid Radiotracer
The authors thank Erika Padilla-Morales for her assistance with English language editing and critical review of the manuscript.
Compliance with ethical standards
This work was supported by AGAUR (Agència de Gestió d’Ajuts Universitaris i de Recerca) 2014 SGR grant 279.
Conflict of interest
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
- 6.National Comprehensive Cancer Network. NCCN Clinical Practice Guidelines in Oncology (NCCN Guidelines©): Cervical Cancer. Fort Washington, PA: National Comprehensive Cancer Network; 2017.Google Scholar
- 16.Stoffels I, Leyh J, Pöppel T, Schadendorf D, Klode J. Evaluation of a radioactive and fluorescent hybrid tracer for sentinel lymph node biopsy in head and neck malignancies: prospective randomized clinical trial to compare ICG-(99m)Tc-nanocolloid hybrid tracer versus (99m)Tc-nanocolloid. Eur J Nucl Med Mol Imaging. 2015;42:1631–8.CrossRefPubMedGoogle Scholar
- 24.van der Poel HG, Buckle T, Brouwer OR, Valdés Olmos RA, van Leeuwen FWB. Intraoperative laparoscopic fluorescence guidance to the sentinel lymph node in prostate cancer patients: clinical proof of concept of an integrated functional imaging approach using a multimodal tracer. Eur Urol. 2011;60:826–33.CrossRefPubMedGoogle Scholar
- 26.Brouwer OR, Buckle T, Vermeeren L, Klop WM, Balm AJ, van der Poel HG, et al. Comparing the hybrid fluorescent-radioactive tracer indocyanine green-99mTc-nanocolloid with 99mTc-nanocolloid for sentinel node identification: a validation study using lymphoscintigraphy and SPECT/CT. J Nucl Med. 2012;53:1034–40.CrossRefPubMedGoogle Scholar
- 31.Frontado LM, Brouwer OR, van den Berg NS, Mathéron HM, Vidal-Sicart S, van Leeuwen FW, et al. Added value of the hybrid tracer indocyanine green-99mTc-nanocolloid for sentinel node biopsy in a series of patients with different lymphatic drainage patterns. Rev Esp Med Nucl Imagen Mol. 2013;32:227–33.PubMedGoogle Scholar
- 37.KleinJan GH, van den Berg NS, de Jong J, Wit EM, Thygessen H, Vegt E, et al. Multimodal hybrid imaging agents for sentinel node mapping as a means to (re)connect nuclear medicine to advances made in robot-assisted surgery. Eur J Nucl Med Mol Imaging. 2016;43:1278–87.CrossRefPubMedPubMedCentralGoogle Scholar