ArticleEuropean journal of nuclear medicine and molecular imaging2023
FAP expression in alpha cells of Langherhans insulae-implications for FAPI radiopharmaceuticals' use.
Article in European journal of nuclear medicine and molecular imaging, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed, 8 citations in OpenAlex.
- Design, Synthesis, and Evaluation of OncoFAP Derivatives with the Albumin Binder as Novel Antitumor Radiopharmaceuticals.Chemical & biomedical imaging · 2026Article
- Fibroblast activation protein inhibitor (FAPI) PET imaging in pulmonary fibrosis: pathophysiology, clinical utility, and emerging theranostic applications.Respiratory research · 2026Review
- The comparative utility of FAPI-based PET radiotracers over [American journal of nuclear medicine and molecular imaging · 2024Review
- Immunohistochemical basis for FAP as a candidate theranostic target across a broad range of cholangiocarcinoma subtypes.Frontiers in nuclear medicine · 2024Article
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Authors and funding
10 authors at 5 institutions in 2 countries.
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Abstract
purposeRadiopharmaceuticals targeting fibroblast activation protein (FAP) alpha are increasingly studied for diagnostic and therapeutic applications. We discovered FAP expression at immunohistochemistry (IHC) in the alpha cells of the Langerhans insulae of few patients. Therefore, we planned an investigation aimed at describing FAP expression in the pancreas and discussing the implications for radioligand applications.
methodsWe retrospectively included 40 patients from 2 institutions (20 pts each) according to the following inclusion/exclusion criteria: (i) pathology proven pancreatic ductal adenocarcinoma and neuroendocrine tumors (NET), 10 pts per each group at each center; (ii) and availability of paraffin-embedded tissue; and (iii) clinical-pathological records. We performed IHC analysis and applied a semiquantitative visual scoring system (0, negative staining; 1, present in less than 30%; 2, present in more than 30% of the area). FAP expression was assessed according to histology-NET (n = 20) vs ductal adenocarcinoma (n = 20)-and to previous treatments within the adenocarcinoma group. The local ethics committee approved the study (No. INT 21/16, 28 January 2016).
resultsThe population consisted of 24 males and 16 females, with a median age of 68 and a range of 14-84 years; 8/20 adenocarcinoma patients received chemotherapy. In all the Langerhans insulae (40/40), pancreatic alpha cells were found to express FAP, with a score of 2. No difference was found among NET (20/20) and adenocarcinoma (20/20), nor according to neoadjuvant chemotherapy in the adenocarcinoma cohort (received or not received).
conclusionPancreatic Langerhans islet alpha cells normally express FAP. This is not expected to influence the diagnostic accuracy of FAP-targeting tracers. In the therapeutic setting, our results suggest the need to better elucidate FAPI radioligands' effects on the Langerhans insulae function.
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