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Matsusaka Y, Werner RA, Serfling SE, Buck AK, Kosmala A, Sasaki T, Weich A, Higuchi T. Evaluating the Patterns of FAPI Uptake in the Shoulder Joint: a Preliminary Study Comparing with FDG Uptake in Oncological Studies. Mol Imaging Biol 2024; 26:294-300. [PMID: 38177615 DOI: 10.1007/s11307-023-01893-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 12/12/2023] [Accepted: 12/21/2023] [Indexed: 01/06/2024]
Abstract
BACKGROUND Fibroblast activation protein inhibitor (FAPI) targeting PET has been introduced as a novel molecular imaging modality for visualizing cancer-associated fibroblasts. There have also been reports suggesting incidental findings of localized accumulation in the shoulder joints. However, further characterization in a larger patient cohort is still lacking. METHODS 77 consecutive patients (28 females; mean age, 63.1 ± 11.6) who underwent Ga-68 FAPI-04 PET/CT for diagnosis of solid tumors were included. The incidence and localization of tracer uptake in shoulder joints were investigated and compared with available F-18 FDG scans serving as reference. RESULTS Ga-68 FAPI-04 uptake was evaluated in 77 patients (154 shoulder joints), of whom 54 subjects (108 shoulder joints) also had available F-18 FDG scans for head-to-head comparison. On FAPI-targeted imaging, 67/154 shoulders (43.5%) demonstrated increased radiotracer accumulation in target lesions, which were distributed as follows: acromioclavicular (AC) joints in 25/67 (37.3%), followed by glenohumeral and subacromial (GH + SA) joints in 23/67 (34.3%), or both (AC and GH + SA joints) in the remaining 19/67 (28.4%). Ga-68 FAPI-04 correlated with quantified F-18 FDG uptake (r = 0.69, p < 0.0001). Relative to the latter radiotracer, however, in-vivo FAP expression in the shoulders was significantly increased (Ga-68 FAPI-04, 4.7 ± 3.2 vs F-18 FDG, 3.6 ± 1.3, p < 0.001). CONCLUSION Our study revealed focal accumulation of Ga-68 FAPI-04 in the shoulders, particularly in the AC joints, with higher uptake compared to the inflammatory-directed PET radiotracer F-18 FDG in oncological studies. As a result, further trials are warranted to investigate the potential of FAPI-directed molecular imaging in identifying chronic remodeling in shoulder joints. This could have implications for initiating anti-FAP targeted photodynamic therapy based on PET signal strength.
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Affiliation(s)
- Yohji Matsusaka
- Department of Nuclear Medicine and Comprehensive Heart Failure Center (CHFC), Molecular Imaging of the Heart, University Hospital of Würzburg, Oberdürrbacher Str. 6, ZIM House A4, 97080, Würzburg, Germany
| | - Rudolf A Werner
- Department of Nuclear Medicine and Comprehensive Heart Failure Center (CHFC), Molecular Imaging of the Heart, University Hospital of Würzburg, Oberdürrbacher Str. 6, ZIM House A4, 97080, Würzburg, Germany
- Division of Nuclear Medicine and Molecular Imaging, The Russell H Morgan Department of Radiology and Radiological Sciences, Johns Hopkins School of Medicine, Baltimore, MD, USA
| | - Sebastian E Serfling
- Department of Nuclear Medicine and Comprehensive Heart Failure Center (CHFC), Molecular Imaging of the Heart, University Hospital of Würzburg, Oberdürrbacher Str. 6, ZIM House A4, 97080, Würzburg, Germany
| | - Andreas K Buck
- Department of Nuclear Medicine and Comprehensive Heart Failure Center (CHFC), Molecular Imaging of the Heart, University Hospital of Würzburg, Oberdürrbacher Str. 6, ZIM House A4, 97080, Würzburg, Germany
| | - Aleksander Kosmala
- Department of Nuclear Medicine and Comprehensive Heart Failure Center (CHFC), Molecular Imaging of the Heart, University Hospital of Würzburg, Oberdürrbacher Str. 6, ZIM House A4, 97080, Würzburg, Germany
| | - Takanori Sasaki
- Department of Nuclear Medicine and Comprehensive Heart Failure Center (CHFC), Molecular Imaging of the Heart, University Hospital of Würzburg, Oberdürrbacher Str. 6, ZIM House A4, 97080, Würzburg, Germany
- Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Alexander Weich
- Internal Medicine II and ENETS CoE NET-Zentrum Würzburg, Gastroenterology, University Hospital Würzburg, Würzburg, Germany
| | - Takahiro Higuchi
- Department of Nuclear Medicine and Comprehensive Heart Failure Center (CHFC), Molecular Imaging of the Heart, University Hospital of Würzburg, Oberdürrbacher Str. 6, ZIM House A4, 97080, Würzburg, Germany.
- Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
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Abstract
Acute abdominal pain in childhood is a frequent reason for a medical consultation. The main diseases that lead to the clinical situation of acute abdomen show a significant age dependency. It is reasonable to group such ailments into three age categories: (1) the neonatal and infant period, (2) toddlerhood to kindergarten and (3) school age children. The task of the pediatric radiological examination is the differential diagnostic correlation of symptoms to the respective diseases. In children ultrasound is the appropriate method of choice.
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Affiliation(s)
- R Wunsch
- Abteilung Radiologie, Sonographie und Magnetresonanztomographie, Vestische Kinder- und Jugendklinik Datteln, Universität Witten/Herdecke, Dr.-Friedrich-Steiner-Str. 5, 45711, Datteln, Deutschland,
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