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- Title
A phase 1, first-in-human study of <sup>18</sup>F-GP1 positron emission tomography for imaging acute arterial thrombosis.
- Authors
Chae, Sun Young; Kwon, Tae-Won; Jin, Soyoung; Kwon, Sun U.; Sung, Changhwan; Oh, Seung Jun; Lee, Sang Ju; Oh, Jungsu S.; Han, Youngjin; Cho, Yong-Pil; Lee, Narae; Kim, Ji Young; Koglin, Norman; Berndt, Mathias; Stephens, Andrew W.; Moon, Dae Hyuk
- Abstract
Background: 18F-GP1 is a novel positron emission tomography (PET) tracer that targets glycoprotein IIb/IIIa receptors on activated platelets. The study objective was to explore the feasibility of directly imaging acute arterial thrombosis (AAT) with 18F-GP1 PET/computed tomography (PET/CT) and to quantitatively assess 18F-GP1 uptake. Safety, biodistribution, pharmacokinetics and metabolism were also evaluated.Methods: Adult patients who had signs or symptoms of AAT or had recently undergone arterial intervention or surgery within 14 days prior to 18F-GP1 PET/CT were eligible for inclusion. The AAT focus was demonstrated by conventional imaging within the 5 days prior to 18F-GP1 administration. Whole-body dynamic 18F-GP1 PET/CT images were acquired for up to 140 min after injection of 250 MBq of 18F-GP1. Venous plasma samples were analysed to determine 18F-GP1 clearance and metabolite formation.Results: Among the ten eligible patients assessed, underlying diseases were abdominal aortic aneurysm with endovascular repair (n = 6), bypass surgery and stent placement (n = 1), endarterectomy (n = 1), arterial dissection (n = 1) and acute cerebral infarction (n = 1). 18F-GP1 administration and PET/CT procedures were well tolerated, with no drug-related adverse events. All patients showed high initial 18F-GP1 uptake in the spleen, kidney and blood pool, followed by rapid clearance. Unmetabolised plasma 18F-GP1 levels peaked at 4 min post-injection and decreased over time until 120 min. The overall image quality was sufficient for diagnosis in all patients and AAT foci were detected in all participants. The 18F-GP1 uptake in AAT foci remained constant from 7 min after injection and began to separate from the blood pool after 20 min. The median standardised uptake value of AAT was 5.0 (range 2.4-7.9) at 120 min post-injection. The median ratio of standardised uptake value of AAT foci to the mean blood pool activity was 3.4 (range 2.0-6.3) at 120 min.Conclusions: 18F-GP1 is a safe and promising novel PET tracer for imaging AAT with a favourable biodistribution and pharmacokinetic profile.Trial registration: ClinicalTrials.gov identifier: NCT02864810, Registered August 3, 2016.
- Subjects
THROMBOSIS diagnosis; GLYCOPROTEINS; POSITRON emission tomography; AORTIC aneurysms; BLOOD platelets
- Publication
EJNMMI Research, 2019, Vol 9, Issue 1, p1
- ISSN
2191-219X
- Publication type
Article
- DOI
10.1186/s13550-018-0471-8