@inproceedings{7fbfdbe03a0e403da107ea9c07135eb2,
title = "A proof-of-concept methodology to validate the in situ visualization of residual disease using cancer-targeted molecular agents in fluorescence-guided surgery",
abstract = "Introduction: The clinical need for improved intraoperative tumor visualization has led to the development of targeted contrast agents for fluorescence-guided surgery (FGS). A key characteristic of these agents is their high tumor specificity, which could enable detection of residual lesions that would likely be mi{\ss}ed by visual inspection. Here, we examine the utility of a promising somatostatin receptor subtype-2 ({\ss}TR2)-targeted fluorescent agent for detecting residual disease in mouse xenografts using FGS and post-operative histopathological validation. Methods: Mice (n=2) implanted with {\ss}TR2 overexpre{\ss}ing tumors were injected with 2 nmol of the dual-labeled somatostatin analog, 67Ga-MMC(IR800)-TOC, and tumors were resected 48 h post-injection using traditional white light reflectance and palpation. Tumors underwent gamma counting and histopathology analysis. The wide-field FGS imaging platform (OnLume) was used to evaluate residual disease in situ under ambient light representative of an operating room. Results: The tumor was resected with gro{\ss}ly negative margins using conventional inspection and palpation; however, additional in situ residual disease was found in the tumor cavity using FGS imaging. In situ fluorescent tumor contrast-to-noise ratios (CNRs) were 3.0 and 5.2. Agent accumulation was 7.72 and 8.20 %ID/g in tumors and 0.27 and 0.20 %ID/g in muscle. Fluorescence pixel values and gamma counts were highly correlated (r = 0.95, P < 0.048). H&E and IHC staining confirmed cancer positivity and {\ss}TR2-overexpre{\ss}ion, respectively. Conclusion: Our findings demonstrate that the use of clinically relevant fluorescence imaging instrumentation enhances the evaluation of promising FGS agents for in situ visualization of residual disease.",
keywords = "Cancer surgery, Fluorescence system instrumentation, Fluorescence-guided surgery, Intraoperative imaging, Residual disease, Somatostatin receptor, Targeted agent",
author = "{Hernandez Vargas}, Servando and Christie Lin and Solmaz Aghaamiri and Julie Vo{\ss} and Naruhiko Ikoma and {Tran Cao}, {Hop S.} and Ghosh, {Sukhen C.} and Uselmann, {Adam J.} and Ali Azhdarinia",
note = "Publisher Copyright: {\textcopyright} COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.; Molecular-Guided Surgery: Molecules, Devices, and Applications VI 2020 ; Conference date: 01-02-2020 Through 02-02-2020",
year = "2020",
doi = "10.1117/12.2546190",
language = "English (US)",
series = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",
publisher = "SPIE",
editor = "Sylvain Gioux and Gibbs, {Summer L.} and Pogue, {Brian W.}",
booktitle = "Molecular-Guided Surgery",
}