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Gabriels, R.Y.* ; van Heijst, L.E.* ; Hooghiemstra, W.T.R.* ; van der Waaij, A.M.* ; Kats-Ugurlu, G.* ; Karrenbeld, A.* ; Robinson, D.J.* ; Tenditnaya, A. ; Ntziachristos, V. ; Gorpas, D. ; Nagengast, W.B.*

Detection of early esophageal neoplastic barrett lesions with quantified fluorescence molecular endoscopy using Cetuximab-800CW.

J. Nucl. Med. 64, 803-808 (2023)

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Esophageal adenocarcinoma causes 6% of cancer-related deaths worldwide. Near-infrared fluorescence molecular endoscopy (NIR-FME) uses a tracer that targets overexpressed proteins. In this study, we aimed to investigate the feasibility of an epidermal growth factor receptor (EGFR)–targeted tracer, cetuximab-800CW, to improve detection of early-stage esophageal adenocarcinoma. Methods: We validated EGFR expression in 73 esophageal tissue sections. Subsequently, we topically administered cetuximab-800CW and performed high-definition white-light endoscopy (HD-WLE), narrow-band imaging, and NIR-FME in 15 patients with Barrett esophagus (BE). Intrinsic fluorescence values were quantified using multidiameter single-fiber reflectance and single-fiber fluorescence spectroscopy. Back-table imaging, histopathologic examination, and EGFR immunohistochemistry on biopsy samples collected during NIR-FME procedures were performed and compared with in vivo imaging results. Results: Immunohistochemical preanalysis showed high EGFR expression in 67% of dysplastic tissue sections. NIR-FME visualized all 12 HD-WLE–visible lesions and 5 HD-WLE–invisible dysplastic lesions, with increased fluorescence signal in visible dysplastic BE lesions compared with nondysplastic BE as shown by multidiameter single-fiber reflectance/single-fiber fluorescence, reflecting a target-to-background ratio of 1.5. Invisible dysplastic lesions also showed increased fluorescence, with a target-to-background ratio of 1.67. Immunohistochemistry analysis showed EGFR overexpression in 16 of 17 (94%) dysplastic BE lesions, which all showed fluorescence signal. Conclusion: This study has shown that NIR-FME using cetuximab-800CW can improve detection of dysplastic lesions missed by HD-WLE and narrow-band imaging.

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