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Feng Y, Pannem S, Hodge S, Rounds C, Tichauer KM, Paulsen KD, Samkoe KS. Quantitative pharmacokinetic and biodistribution studies for fluorescent imaging agents. BIOMEDICAL OPTICS EXPRESS 2024; 15:1861-1877. [PMID: 38495714 PMCID: PMC10942698 DOI: 10.1364/boe.504878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 12/02/2023] [Accepted: 01/22/2024] [Indexed: 03/19/2024]
Abstract
Pharmacokinetics and biodistribution studies are essential for characterizing fluorescent agents in vivo. However, few simple methods based on fluorescence imaging are available that account for tissue optical properties and sample volume differences. We describe a method for simultaneously quantifying mean fluorescence intensity of whole blood and homogenized tissues in glass capillary tubes for two fluorescent agents, ABY-029 and IRDye 680LT, using wide-field imaging and tissue-specific calibration curves. All calibration curves demonstrated a high degree of linearity with mean R2 = 0.99 ± 0.01 and RMSE = 0.12 ± 0.04. However, differences between linear regressions indicate that tissue-specific calibration curves are required for accurate concentration recovery. The lower limit of quantification (LLOQ) for all samples tested was determined to be < 0.3 nM for ABY-029 and < 0.4 nM for IRDye 680LT.
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Affiliation(s)
- Yichen Feng
- Geisel School of Medicine, Dartmouth College, 1 Rope Ferry Road, Hanover, NH 03755, USA
| | - Sanjana Pannem
- Thayer School of Engineering, Dartmouth College, 15 Thayer Drive, Hanover, NH 03755, USA
| | - Sassan Hodge
- Thayer School of Engineering, Dartmouth College, 15 Thayer Drive, Hanover, NH 03755, USA
| | - Cody Rounds
- Department of Biomedical Engineering, Illinois Institute of Technology, 10 West 35 Street, Chicago, IL 60616, USA
| | - Kenneth M. Tichauer
- Department of Biomedical Engineering, Illinois Institute of Technology, 10 West 35 Street, Chicago, IL 60616, USA
| | - Keith D. Paulsen
- Thayer School of Engineering, Dartmouth College, 15 Thayer Drive, Hanover, NH 03755, USA
| | - Kimberley S. Samkoe
- Geisel School of Medicine, Dartmouth College, 1 Rope Ferry Road, Hanover, NH 03755, USA
- Thayer School of Engineering, Dartmouth College, 15 Thayer Drive, Hanover, NH 03755, USA
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Torres VC, Hodge S, Levy JJ, Vaickus LJ, Chen EY, LeBouef M, Samkoe KS. Paired-agent imaging as a rapid en face margin screening method in Mohs micrographic surgery. Front Oncol 2023; 13:1196517. [PMID: 37427140 PMCID: PMC10325620 DOI: 10.3389/fonc.2023.1196517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 06/05/2023] [Indexed: 07/11/2023] Open
Abstract
Background Mohs micrographic surgery is a procedure used for non-melanoma skin cancers that has 97-99% cure rates largely owing to 100% margin analysis enabled by en face sectioning with real-time, iterative histologic assessment. However, the technique is limited to small and aggressive tumors in high-risk areas because the histopathological preparation and assessment is very time intensive. To address this, paired-agent imaging (PAI) can be used to rapidly screen excised specimens and identify tumor positive margins for guided and more efficient microscopic evaluation. Methods A mouse xenograft model of human squamous cell carcinoma (n = 8 mice, 13 tumors) underwent PAI. Targeted (ABY-029, anti-epidermal growth factor receptor (EGFR) affibody molecule) and untargeted (IRDye 680LT carboxylate) imaging agents were simultaneously injected 3-4 h prior to surgical tumor resection. Fluorescence imaging was performed on main, unprocessed excised specimens and en face margins (tissue sections tangential to the deep margin surface). Binding potential (BP) - a quantity proportional to receptor concentration - and targeted fluorescence signal were measured for each, and respective mean and maximum values were analyzed to compare diagnostic ability and contrast. The BP and targeted fluorescence of the main specimen and margin samples were also correlated with EGFR immunohistochemistry (IHC). Results PAI consistently outperformed targeted fluorescence alone in terms of diagnostic ability and contrast-to-variance ratio (CVR). Mean and maximum measures of BP resulted in 100% accuracy, while mean and maximum targeted fluorescence signal offered 97% and 98% accuracy, respectively. Moreover, maximum BP had the greatest average CVR for both main specimen and margin samples (average 1.7 ± 0.4 times improvement over other measures). Fresh tissue margin imaging improved similarity with EGFR IHC volume estimates compared to main specimen imaging in line profile analysis; and margin BP specifically had the strongest concordance (average 3.6 ± 2.2 times improvement over other measures). Conclusions PAI was able to reliably distinguish tumor from normal tissue in fresh en face margin samples using the single metric of maximum BP. This demonstrated the potential for PAI to act as a highly sensitive screening tool to eliminate the extra time wasted on real-time pathological assessment of low-risk margins.
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Affiliation(s)
- Veronica C. Torres
- Thayer School of Engineering, Dartmouth College, Hanover, NH, United States
| | - Sassan Hodge
- Thayer School of Engineering, Dartmouth College, Hanover, NH, United States
| | - Joshua J. Levy
- Geisel School of Medicine, Dartmouth College, Hanover, NH, United States
- Department of Pathology and Laboratory Medicine, Dartmouth Hitchcock Medical Center, Lebanon, NH, United States
- Department of Dermatology, Dartmouth Hitchcock Medical Center, Lebanon, NH, United States
- Quantitative Biomedical Sciences, Geisel School of Medicine, Dartmouth College, Hanover, NH, United States
- Department of Epidemiology, Geisel School of Medicine, Dartmouth College, Hanover, NH, United States
| | - Louis J. Vaickus
- Department of Pathology and Laboratory Medicine, Dartmouth Hitchcock Medical Center, Lebanon, NH, United States
| | - Eunice Y. Chen
- Geisel School of Medicine, Dartmouth College, Hanover, NH, United States
- Department of Surgery, Dartmouth Hitchcock Medical Center, Lebanon, NH, United States
| | - Matthew LeBouef
- Geisel School of Medicine, Dartmouth College, Hanover, NH, United States
- Department of Dermatology, Dartmouth Hitchcock Medical Center, Lebanon, NH, United States
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Gibbs SL, Delikatny EJ. Editorial to the Special Issue Entitled "Optical Surgical Navigation". Mol Imaging Biol 2023; 25:1-2. [PMID: 36729349 DOI: 10.1007/s11307-023-01806-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Summer L Gibbs
- Biomedical Engineering Department, Knight Cancer Institute, Oregon Health & Science University, Portland, OR, 97201, USA.
| | - Edward J Delikatny
- Department of Radiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
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