Abstract
Purpose
[18F]FDG PET/CT may predict the absence of acute allograft rejection (AR) in kidney transplant recipients (KTRs) with acute kidney injury (AKI). Still, the proposed threshold of 1.6 of the mean of mean standardized uptake values (mSUVmean) in the renal parenchyma needs validation.
Methods
We prospectively performed 86 [18F]FDG PET/CT in 79 adult KTRs who underwent per-cause transplant biopsy for suspected AR. Biopsy-proven polyoma BK nephropathies (n = 7) were excluded. PET/CT was performed 192 ± 18 min after administration of 254.4 ± 30.4 MBq of [18F]FDG. The SUVmean was measured in both upper and lower poles of the renal allograft. One-way analysis of variance (ANOVA) and Tukey’s studentized range test were sequentially performed. The receiver operating characteristic (ROC) curve was drawn to discriminate “AR” from non-pathological (“normal” + “borderline”) conditions.
Results
The median age of the cohort was 55 [43; 63] years, with M/F gender ratio of 47/39. The mean eGFR was 31.9 ± 14.6 ml/min/1.73m2. Biopsies were categorized in 4 groups: “normal” (n = 54), “borderline” (n = 9), “AR” (n = 14), or “others” (n = 2). The median [min; max] mSUVmean reached 1.72 [1.02; 2.07], 1.97 [1.55; 2.11], 2.13 [1.65, 3.12], and 1.84 [1.57; 2.12] in “normal,” “borderline,” “AR,” and “others” groups, respectively. ANOVA demonstrated a significant difference of mSUVmean among groups (F = 13.25, p < 0.0001). The ROC area under the curve was 0.86. Test sensitivity and specificity corresponding to the threshold value of 1.6 were 100% and 30%, respectively.
Conclusion
[18F]FDG PET/CT may help noninvasively prevent inessential transplant biopsies in KTR with AKI.
Data availability
The data will be made available on request.
Code availability
N/A.
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Acknowledgements
The authors cordially thank the surgeons (C. Coimbra Marques, A. De Roover, O. Detry, E. Hamoir, P. Honoré, L. Kohnen, N. Meurisse, and J-P Squifflet), the physicians (P. Erpicum, O. Hanssen, L. Vanovermeire, and P. Xhignesse), and the members of the local transplant coordination center (M-H. Delbouille, J. Monard, S. Princen, and A. Waromes), as well as the staff of the Division of Nuclear Medicine of the University of Liège Hospital in Liège, Belgium. FJ is a Fellow of the Fonds National de la Recherche Scientifique and received support from the University of Liège (Fonds Spéciaux à la Recherche) and from the Fondation Léon Fredericq.
Funding
FJ is a Fellow of the Fonds National de la Recherche Scientifique and received support from the University of Liège (Fonds Spéciaux à la Recherche) and from the Fondation Léon Fredericq.
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Authors and Affiliations
Contributions
LP, LW, RH, and FJ designed the study; RH and FJ secured the funding of the study; HP performed the statistical analyses; LW, AB, and CB recruited the patients and filled the medical files; AB performed the kidney biopsies; CB and SG scored the biopsies; LP and RH scored the [18F]FDG PET/CT images; LP and FJ wrote the manuscript; all authors approved the final version of the manuscript.
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Ethics approval
The study was approved by the institutional review board of the ULiège Academic Hospital (#B707201215598).
Consent to participate
After written informed consent, adult KTRs undergoing a transplant biopsy for suspected AR were prospectively enrolled between March 2015 and December 2019.
Conflicts of interest
The authors declare no competing interests.
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This article is part of the Topical Collection on Infection and inflammation
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Lovinfosse, P., Weekers, L., Pottel, H. et al. [18F]FDG PET/CT imaging disproves renal allograft acute rejection in kidney transplant recipients with acute kidney dysfunction: a validation cohort. Eur J Nucl Med Mol Imaging 49, 331–335 (2021). https://doi.org/10.1007/s00259-021-05467-0
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DOI: https://doi.org/10.1007/s00259-021-05467-0