Abstract
Purpose
This study compares fluorescence imaging to mass spectroscopy (inductively coupled plasma–mass spectroscopy, ICP–MS) for detection of quantum dots (QDs) in sentinel lymph node (LN) mapping of breast cancer.
Procedures
We study the accumulation of near-infrared-emitting QDs into regional LNs and their whole-body biodistribution in mice after subcutaneous injection, using in vivo fluorescence imaging and ex vivo elemental analysis by ICP–MS.
Results
We show that the QD accumulation in regional LNs is detectable by fluorescence imaging as early as 5 min post-delivery. Their concentration reaches a maximum at 4 h then decreases over a 10-day observation period. These data are confirmed by ICP–MS. The QD uptake in other organs, assessed by ICP–MS, increases steadily over time; however, its overall level remains rather low.
Conclusions
Fluorescence imaging can be used as a non-invasive alternative to ICP–MS to follow the QD accumulation kinetics into regional LNs.
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Abbreviations
- % ID:
-
Percentage of injected dose
- Abs:
-
Absorbance
- ALN:
-
Axillary lymph node
- ALND:
-
Axillary lymph node dissection
- AU:
-
Arbitrary unit
- DLS:
-
Dynamic light scattering
- DPPE:
-
Dipalmitoyl phosphotidylethanolamine
- H&E:
-
Hematoxylin and eosin
- HD:
-
Hydrodynamic diameter
- ICP–AES:
-
Inductively coupled plasma–atomic emission spectroscopy
- ICP–MS:
-
Inductively coupled plasma–mass spectroscopy
- i.v.:
-
Intravenous
- LALN:
-
Left axillary lymph node
- LED:
-
Light-emitting diode
- LLTLN:
-
Left lateral thoracic lymph node
- LN:
-
Lymph node
- LTLN:
-
Lateral thoracic lymph node
- Me:
-
Methyl ether
- microPET:
-
Micro-positron emission tomography
- NIR:
-
Near-infrared
- PBS:
-
Phosphate buffered saline
- PEG:
-
Polyethylene glycol
- PL:
-
Photoluminescence
- QD:
-
Quantum dot
- RALN:
-
Right axillary lymph node
- RLTLN:
-
Right lateral thoracic lymph node
- ROI:
-
Region of interest
- s.c.:
-
Subcutaneous
- SD:
-
Standard deviation
- SLN:
-
Sentinel lymph node
- SLNB:
-
Sentinel lymph node biopsy
- TEM:
-
Transmission electron microscopy
- TOP:
-
Trioctylphosphine
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Acknowledgements
This work was supported by the Institut National du Cancer (INCa), the Comités départementaux (54, 57) of the Ligue Contre le Cancer, the Ligue Nationale Contre le Cancer, and the Région Lorraine.
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The present “research article” addresses near-infrared-emitting quantum dots detection by fluorescence imaging as a non-invasive and reliable method for identification of regional lymph nodes for their eventual use in breast tumor patients.
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Pic, E., Pons, T., Bezdetnaya, L. et al. Fluorescence Imaging and Whole-Body Biodistribution of Near-Infrared-Emitting Quantum Dots after Subcutaneous Injection for Regional Lymph Node Mapping in Mice. Mol Imaging Biol 12, 394–405 (2010). https://doi.org/10.1007/s11307-009-0288-y
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DOI: https://doi.org/10.1007/s11307-009-0288-y