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Published in: European Journal of Nuclear Medicine and Molecular Imaging 10/2022

Open Access 06-01-2022 | Chronic Kidney Disease | Original Article

[68 Ga]Ga-FAPI uptake correlates with the state of chronic kidney disease

Authors: Patrick Conen, Francesca Pennetta, Katharina Dendl, Fabian Hertel, Andreas Vogg, Uwe Haberkorn, Frederik L. Giesel, Felix M. Mottaghy

Published in: European Journal of Nuclear Medicine and Molecular Imaging | Issue 10/2022

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Abstract

Purpose

Kidney fibrosis leads to a progressive reduction in kidney function ultimately resulting in kidney failure. Diagnostic tools to detect kidney fibrosis are all invasive in nature requiring kidney biopsies with subsequent histological validation. In this retrospective study, the diagnostic value of three different radiotracers for the noninvasive prediction of kidney fibrosis was analyzed, taking into account the glomerular filtration rate (GFR) and the intra-renal parenchymal radiotracer uptake.

Methods

In 81 patients receiving either one of the following molecular imaging probes, [68 Ga]Ga-FAPI, [68 Ga]Ga-PSMA, or [68 Ga]Ga-DOTATOC, kidney function parameters were correlated with SUVmax and SUVmean of the renal parenchyma and background activity measured in lung parenchyma, myocardium, gluteal muscle, and the abdominal aorta. Patients were clustered according to their grade of chronic kidney disease (CKD), and a regression analysis and one-way ANOVA were conducted in this retrospective analysis.

Results

We found a negative correlation between GFR and [68 Ga]Ga-FAPI uptake for both SUVmax and SUVmean values, whereas background activity showed no correlation with GFR. [68 Ga]Ga-DOTATOC and [68 Ga]Ga-PSMA did not correlate between CKD stage and intra-renal parenchymal radiotracer uptake. Only [68 Ga]Ga-PSMA background activity exhibited a positive correlation with GFR suggesting an unspecific binding/retention potentially due to longer circulation times.

Conclusion

There is a significant negative correlation between renal parenchymal [68 Ga]Ga-FAPI uptake and GFR, which was not the case for [68 Ga]Ga-DOTATOC and [68 Ga]Ga-PSMA. This correlation suggests a specific binding of FAPI rather than a potential unspecific retention in the renal parenchyma, underlining the potential value of [68 Ga]Ga-FAPI for the noninvasive quantitative evaluation of kidney fibrosis.
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Metadata
Title
[68 Ga]Ga-FAPI uptake correlates with the state of chronic kidney disease
Authors
Patrick Conen
Francesca Pennetta
Katharina Dendl
Fabian Hertel
Andreas Vogg
Uwe Haberkorn
Frederik L. Giesel
Felix M. Mottaghy
Publication date
06-01-2022
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nuclear Medicine and Molecular Imaging / Issue 10/2022
Print ISSN: 1619-7070
Electronic ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-021-05660-1

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