Abstract
Purpose
Compare the value of imaging using positron 18F-labeled fibroblast activation protein inhibitor-42 (18F-FAPI-42) and 18F-labeled deoxyglucose (18F-FDG) for assessment of AKI.
Procedures
This study analyzed cancer patients who received 18F-FAPI-42 and 18F-FDG PET/CT imaging. Eight patients had AKI with bilateral ureteral obstruction (BUO), eight had BUO (CKD1–2) with no acute kidney disease (AKD), and eight had no ureteral obstruction (UO) with normal renal function. The average standardized uptake value (SUVave) of the renal parenchyma (RP-SUVave), the blood pool SUVave (B- SUVave), SUVave in the highest region of the renal collective system (RCS-SUVave), and the highest serum creatinine level (top SCr) were recorded.
Results
The 18F-FAPI-42 and 18F-FDG results showed that radiotracer of renal parenchyma was more concentrated in the AKI group than in the other two groups, whereas the RP-SUVave from 18F-FAPI-42 was higher than that from 18F-FDG in the AKI group (all P < 0.05). 18F-FAPI-42 imaging in the AKI group showed uptake by the renal parenchyma with a diffuse increase, but very little radiotracer in the renal collecting system, similar to a “super kidney scan.” The renal parenchyma also had an increase of SUVave, with accumulation of radiotracer in the renal collecting system. AKI was more severe when a patient had a “super kidney scan” in both kidneys (P < 0.05). The B-SUVave level was higher in the AKI group than in the other two groups in 18F-FAPI-42 (both P < 0.05).
Conclusions
18F-FAPI-42 imaging had higher RP-SUVave than 18F-FDG imaging in cancer patients who had BUO with AKI. An increased renal parenchyma uptake in both kidneys and low radiotracer distribution in the collecting system suggest more severe AKI.
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Data Availability
All the data is available.
Abbreviations
- FAPI:
-
Fibroblast activation protein inhibitor
- FDG:
-
Fluorodeoxyglucose
- SUVave :
-
Average standardized uptake value
- AKI:
-
Acute kidney injury
- AKD:
-
Acute kidney disease
- CKD:
-
Chronic kidney disease
- ESRD:
-
End-stage renal disease
- KRT:
-
Kidney replacement therapy
- eGFR:
-
Estimated glomerular filtration rate
- SCr:
-
Serum creatinine
- CKD-EPI:
-
Chronic Kidney Disease Epidemiology Collaboration
- 99Tcm-DTPA:
-
99Tcm-Diathylenetriamine penta-acetic acid
- RP-SUVave :
-
Renal parenchyma SUVave
- RCS-SUVave :
-
Renal collecting system SUVave
- B-SUVave :
-
Abdominal aorta blood pool SUVave
- non-UO:
-
No ureteral obstruction
- UO:
-
Ureteral obstruction
- UUO:
-
Unilateral ureteral obstruction
- BUO:
-
Bilateral ureteral obstruction
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Funding
National Natural Science Foundation of China (91949121), Guangdong Basic and Applied Basic Research Foundation (2214050005512), Nanfang Hospital Talent Introduction Fundation of Southern Medical University (No.123456), and Medical Products Administration of Guangdong Province (2021ZDB02; Drug Supervision and Administration Division1 (2022)).
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Chi, X., Yang, X., Li, G. et al. A Comparative Study of 18F-FAPI-42 and 18F-FDG PET/CT for Evaluating Acute Kidney Injury in Cancer Patients. Mol Imaging Biol 25, 671–680 (2023). https://doi.org/10.1007/s11307-023-01820-x
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DOI: https://doi.org/10.1007/s11307-023-01820-x