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- Title
Imaging of fibrogenesis in patients with idiopathic pulmonary fibrosis with cis-4-[(18)F]-Fluoro-L: -proline PET.
- Authors
Lavalaye, Jules; Grutters, Jan C; van de Garde, Ewoudt M W; van Buul, Monique M C; van den Bosch, Jules M M; Windhorst, Albert D; Verzijlbergen, Fred J
- Abstract
<bold>Purpose: </bold>Idiopathic pulmonary fibrosis (IPF) is a lethal lung disease for which no single diagnostic modality is able to evaluate the activity of the disease process. Cis-4-(18)F-fluoro-L: -proline ((18)F-proline) was shown in animal studies to be a reliable marker for fibrosis formation. We tested this candidate radioligand for imaging of fibrogenesis in patients with IPF.<bold>Methods: </bold>Five patients with IPF proven by lung biopsy and computed tomography were included. Furthermore, we also included one patient with non-specific interstitial pneumonia (NSIP) and scleroderma and one with NSIP and organising pneumonia. Positron emission tomography (PET) acquisition was performed 1, 2 and 3h after injection of 400MBq (18)F-proline. We scored (18)F-proline activity visually and quantitatively by calculating the activity in the regions of interest over lung, liver and mediastinum.<bold>Results: </bold>We found low uptake of (18)F-proline in the lungs of all patients with IPF. The highest uptake was seen at 2h post-injection, with a decline at 3h past injection. The differences in lung uptake between patients were small, except for one patient with NSIP and organising pneumonia who had a slightly higher (18)F-proline uptake. No significant correlations between (18)F-proline uptake and clinical parameters were found.<bold>Conclusions: </bold>Due to the low pulmonary uptake of (18)F-proline in patients with IPF, (18)F-proline does not seem to be a suitable radioligand to evaluate the activity of fibrosis formation in patients with IPF. The low uptake in the lungs of patients with interstitial fibrosis may be explained by the slow nature of fibrogenesis or to the relatively low dose of proline that can be used.
- Subjects
COMPARATIVE studies; DIAGNOSTIC imaging; LUNGS; RESEARCH methodology; MEDICAL cooperation; PNEUMONIA; PROLINE; RADIOPHARMACEUTICALS; RESEARCH; POSITRON emission tomography; EVALUATION research; FIBROSIS; IDIOPATHIC pulmonary fibrosis
- Publication
Molecular Imaging & Biology, 2009, Vol 11, Issue 2, p123
- ISSN
1536-1632
- Publication type
journal article
- DOI
10.1007/s11307-008-0164-1