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Published in: European Journal of Nuclear Medicine and Molecular Imaging 12/2015

01-11-2015 | Original Article

Biodistribution of the 18F-FPPRGD2 PET radiopharmaceutical in cancer patients: an atlas of SUV measurements

Authors: Ryogo Minamimoto, Mehran Jamali, Amir Barkhodari, Camila Mosci, Erik Mittra, Bin Shen, Frederick Chin, Sanjiv Sam Gambhir, Andrei Iagaru

Published in: European Journal of Nuclear Medicine and Molecular Imaging | Issue 12/2015

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Abstract

Purpose

The aim of this study was to investigate the biodistribution of 2-fluoropropionyl-labeled PEGylated dimeric arginine-glycine-aspartic acid (RGD) peptide (PEG3-E[c{RGDyk}]2) (18F-FPPRGD2) in cancer patients and to compare its uptake in malignant lesions with 18F-FDG uptake.

Methods

A total of 35 patients (11 men, 24 women, mean age 52.1 ± 10.8 years) were enrolled prospectively and had 18F-FPPRGD2 PET/CT prior to treatment. Maximum standardized uptake values (SUVmax) and mean SUV (SUVmean) were measured in 23 normal tissues in each patient, as well as in known or suspected cancer lesions. Differences between 18F-FPPRGD2 uptake and 18F-FDG uptake were also evaluated in 28 of the 35 patients.

Results

Areas of high 18F-FPPRGD2 accumulation (SUVmax range 8.9 – 94.4, SUVmean range 7.1 – 64.4) included the bladder and kidneys. Moderate uptake (SUVmax range 2.1 – 6.3, SUVmean range 1.1 – 4.5) was found in the choroid plexus, salivary glands, thyroid, liver, spleen, pancreas, small bowel and skeleton. Compared with 18F-FDG, 18F-FPPRGD2 showed higher tumor-to-background ratio in brain lesions (13.4 ± 8.5 vs. 1.1 ± 0.5, P < 0.001), but no significant difference in body lesions (3.2 ± 1.9 vs. 4.4 ± 4.2, P = 0.10). There was no significant correlation between the uptake values (SUVmax and SUVmean) for 18F FPPRGD2 and those for 18F-FDG.

Conclusion

The biodistribution of 18F-FPPRGD2 in cancer patients is similar to that of other RGD dimer peptides and it is suitable for clinical use. The lack of significant correlation between 18F-FPPRGD2 and 18F-FDG uptake confirms that the information provided by each PET tracer is different.
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Metadata
Title
Biodistribution of the 18F-FPPRGD2 PET radiopharmaceutical in cancer patients: an atlas of SUV measurements
Authors
Ryogo Minamimoto
Mehran Jamali
Amir Barkhodari
Camila Mosci
Erik Mittra
Bin Shen
Frederick Chin
Sanjiv Sam Gambhir
Andrei Iagaru
Publication date
01-11-2015
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nuclear Medicine and Molecular Imaging / Issue 12/2015
Print ISSN: 1619-7070
Electronic ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-015-3096-4

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