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Journal of Nuclear Medicine

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Meeting ReportMolecular Targeting Probes - Radioactive and Nonradioactive

Quantification of 18F-JNJ42259152, a novel phosphodiesterase 10A (PDE 10A) PET-tracer: Kinetic modeling and test-retest

Koen Van Laere, Hendra Hudyana, Rawaha Ahmad, Kristof Dubois, Mark Schmidt, Guy Bormans and Michel Koole
Journal of Nuclear Medicine May 2012, 53 (supplement 1) 285;
Koen Van Laere
1Division of Nuclear Medicine, KU Leuven, Leuven, Belgium
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Hendra Hudyana
1Division of Nuclear Medicine, KU Leuven, Leuven, Belgium
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Rawaha Ahmad
1Division of Nuclear Medicine, KU Leuven, Leuven, Belgium
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Kristof Dubois
2Janssen R&D, Janssen Pharmaceutica, Beerse, Belgium
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Mark Schmidt
2Janssen R&D, Janssen Pharmaceutica, Beerse, Belgium
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Guy Bormans
3Radiopharmacy, KU Leuven, Leuven, Belgium
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Michel Koole
1Division of Nuclear Medicine, KU Leuven, Leuven, Belgium
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Abstract

285

Objectives Phosphodiesterase 10A (PDE10A) plays a central role in striatal signaling and is implicated in several neuropsychiatric disorders. We performed initial brain kinetic modeling of the novel PDE10A tracer 18F-JNJ42259152 and studied test-retest reproducibility in healthy volunteers.

Methods 9 healthy volunteers (4 M/5 F; 42-69y) were scanned dynamically up to 135 minutes after bolus injection of 172.5±10.3MBq of 18F-JNJ42259152. Three (1 M/2 F) underwent retest scanning with a mean interscan interval of 37d. Input functions and parent fractions were determined using arterial sampling. VOIs in the caudate (CN), putamen (PT), ventral striatum (VS), substantia nigra (SN) and cerebellum (CBL) were delineated using the individual’s MRI. One (1T) and two tissue (2T) models were evaluated. Distribution volumes (VT) were compared with binding potential (BP) by a simplified reference tissue model (SRTM) using CBL as reference. 90 (SRTM90) and 60 min (SRTM60) scan time intervals were considered. VT and BP test-retest variability was assessed.

Results The average intact tracer half life in blood was 90 min. 1T VT values for CN, PT, VS, SN and CBL were 1.55±0.51, 0.91±0.29, 0.63±0.20, 0.40±0.13 and 0.31±0.07, respectively. 2T provided similar VT values. SRMT BP values for CN, PT, VS and SN were 2.80±0.46, 1.40±0.43, 0.76±0.39 and 0.19±0.14, respectively. SRMT90 and SRMT60 values showed very low bias. Good correlations were found for CN, PT and VS between 1T VT and BP SRMT, BP SRMT90 and BP SRTM60 (r = 0.84, 0.85 and 0.83 respectively). Test-retest variability was 11-16% for 1T VT, 13-15% for BP SRMT, 10-14% for BP SRMT90 and 8-12% for BP SRTM60.

Conclusions Kinetic modeling of 18F-JNJ42259152 shows that PDE10A activity can be reliably quantified non-invasively using a simplified reference tissue model with the cerebellum as reference, with clinically acceptable acquisition times

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Journal of Nuclear Medicine
Vol. 53, Issue supplement 1
May 2012
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Quantification of 18F-JNJ42259152, a novel phosphodiesterase 10A (PDE 10A) PET-tracer: Kinetic modeling and test-retest
Koen Van Laere, Hendra Hudyana, Rawaha Ahmad, Kristof Dubois, Mark Schmidt, Guy Bormans, Michel Koole
Journal of Nuclear Medicine May 2012, 53 (supplement 1) 285;

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Quantification of 18F-JNJ42259152, a novel phosphodiesterase 10A (PDE 10A) PET-tracer: Kinetic modeling and test-retest
Koen Van Laere, Hendra Hudyana, Rawaha Ahmad, Kristof Dubois, Mark Schmidt, Guy Bormans, Michel Koole
Journal of Nuclear Medicine May 2012, 53 (supplement 1) 285;
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