Annals of Surgical Oncology

, Volume 13, Issue 12, pp 1671–1681 | Cite as

Image-Guided Oncologic Surgery Using Invisible Light: Completed Pre-Clinical Development for Sentinel Lymph Node Mapping

  • Eiichi Tanaka
  • Hak Soo Choi
  • Hirofumi Fujii
  • Moungi G. Bawendi
  • John V. Frangioni
Article

Abstract

Background

Invisible near-infrared (NIR) fluorescent light permits high sensitivity, real-time image-guidance during oncologic surgery without changing the look of the surgical field. In this study, we complete pre-clinical development of the technology for sentinel lymph node (SLN) mapping using a large animal model of spontaneous melanoma.

Methods

Sinclair swine with spontaneous melanoma metastatic to regional lymph nodes were used because of their similarity to human melanoma. Organic lymphatic tracers tested included FDA-approved indocyanine green adsorbed non-covalently to human serum albumin (HSA), and NIR fluorophore CW800 conjugated covalently to HSA (HSA800). The inorganic/organic hybrid tracer tested was type II NIR quantum dots with an anionic coating. Primary tumors received four peri-tumoral injections of each tracer, with a fluorophore dose of 100 pmol to 1 nmol per injection. SLN mapping and image-guided resection were performed in real-time.

Results

Each of the 3 lymphatic tracers was injected into n = 4 separate primary melanomas in a total of 6 animals. All 12 injections resulted in identification of the SLN(s) and their associated lymphatic channels within 1 minute in 100% of cases, despite highly pigmented skin and black fur. Hydrodynamic diameter had a profound impact on tracer behavior in vivo.

Conclusions

This study completes the pre-clinical development of NIR fluorescence-guided SLN mapping and provides insight into imaging system optimization and tracer choice for future human clinical trials. The technology is likely to eliminate the need for radioactive and colored tracers, permits real-time image guidance throughout the procedure, and assists the pathologist in tissue analysis.

Keywords

Sentinel lymph node mapping Pre-clinical development Near-infrared light Near-infrared fluorescence Melanoma Sinclair pigs 

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Copyright information

© Society of Surgical Oncology 2006

Authors and Affiliations

  • Eiichi Tanaka
    • 1
  • Hak Soo Choi
    • 1
  • Hirofumi Fujii
    • 1
  • Moungi G. Bawendi
    • 2
  • John V. Frangioni
    • 1
    • 3
    • 4
  1. 1.Division of Hematology/Oncology, Department of MedicineBeth Israel Deaconess Medical CenterBostonUSA
  2. 2.Department of ChemistryMassachusetts Institute of TechnologyCambridgeUSA
  3. 3.Department of RadiologyBeth Israel Deaconess Medical CenterBostonUSA
  4. 4.Beth Israel Deaconess Medical CenterBostonUSA

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