Abstract
Purpose
This study evaluated the effect of formalin fixation for near-infrared (NIR) fluorescence imaging of an antibody-dye complex (panitumumab-IRDye800CW) that was intravenously administered to patients with head and neck squamous cell carcinoma (HNSCC) scheduled to undergo surgery of curative intent.
Procedures
HNSCC patients were infused with 25 or 50 mg of panitumumab-IRDye800CW followed by surgery 1–5 days later. Following resection, primary tumor specimens were imaged in a closed-field fluorescence imaging device, before and after formalin fixation. The fluorescence images of formalin-fixed specimens were compared with images prior to formalin fixation. Regions of interest were drawn on the primary tumor and on the adjacent normal tissue on the fluorescence images. The mean fluorescence intensity (MFI) and tumor-to-background ratios (TBRs) of the fresh and formalin-fixed tissues were compared.
Results
Of the 30 enrolled patients, 20 tissue specimens were eligible for this study. Formalin fixation led to an average of 10 % shrinkage in tumor specimen size (p < 0.0001). Tumor MFI in formalin-fixed specimens was on average 10.9 % lower than that in the fresh specimens (p = 0.0002). However, no statistical difference was found between the TBRs of the fresh specimens and those of the formalin-fixed specimens (p = 0.85).
Conclusions
Despite the 11 % decrease in MFI between fresh and formalin-fixed tissue specimens, the relative difference between tumor and normal tissue as measured in TBR remained unchanged. This data suggests that evaluation of formalin-fixed tissue for assessing the accuracy of fluorescence-guided surgery approaches could provide a valid, yet more flexible, alternative to fresh tissue analysis.
Trial Registration
NCT02415881
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Funding
This project was supported partly by the Stanford Comprehensive Cancer Center, the Netherlands Organization for Scientific Research (Rubicon; 019.171LW.022), the National Institutes of Health and the National Cancer Institute (R01CA190306), the Stanford Molecular Imaging Scholars (SMIS) program (T32CA118681), and a scientific research grant of YOKOYAMA Foundation for Clinical Pharmacology (YRY-1702). Institutional equipment loans were received from LI-COR Biosciences, Inc.
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ELR acts as a consultant for LICOR Biosciences, which manufactures IRDye800, and has equipment loans from this company. All other authors declare that they have no conflict of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committees and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Supplemental Figure 1
Correlations of tumor MFI and TBR in fresh and formalin-fixed tissue. Tumor MFIs and TBR in the formalin-fixed specimens were found to strongly correlate with those in the fresh specimens. (R2 = 0.93 and 0.97, respectively). (PNG 90 kb)
Supplemental Figure 2
Decrease of fluorescence signals in the same piece of tissue over the 10 times. (PNG 202 kb)
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Kapoor, S., Lu, G., van den Berg, N.S. et al. Effect of Formalin Fixation for Near-Infrared Fluorescence Imaging with an Antibody-Dye Conjugate in Head and Neck Cancer Patients. Mol Imaging Biol 23, 270–276 (2021). https://doi.org/10.1007/s11307-020-01553-1
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DOI: https://doi.org/10.1007/s11307-020-01553-1