Abstract
Background
Interstitial nephritis is a common cause of renal failure. Gallium-67 scintigraphy is reportedly useful for diagnosing interstitial nephritis; however, its ability to assess disease activity remains unknown. We aimed to analyze the relationship between the renal uptake of gallium-67 and the disease activity in interstitial nephritis.
Methods
We retrospectively analyzed the data of patients who underwent gallium-67 scintigraphy at a hospital in Tokyo. The renal uptake adjusted for the soft tissues beneath the kidneys was semi-quantitatively evaluated. We compared the renal uptake levels between patients clinically diagnosed with and without interstitial nephritis. Among those undergoing renal biopsy, we evaluated the predictive ability of gallium-67 scintigraphy and analyzed the renal uptake levels regarding the disease activity through a histopathological analysis.
Results
We included 143 patients; among them, 30, 17, and 96 patients were clinically diagnosed with interstitial nephritis, other kidney diseases, and non-kidney diseases, respectively. The renal uptake of gallium-67 was the highest among patients with interstitial nephritis. Among the 25 patients who underwent renal biopsy, 15 were pathologically diagnosed with interstitial nephritis. The renal uptake levels showed a high discriminative ability (C-statistic: 0.83). Furthermore, net reclassification improvement with the addition of gallium-67 scintigraphy to N-acetyl-β-D-glucosaminidase for the prediction of interstitial nephritis was 1.14. Histopathological analysis revealed a positive correlation between renal uptake and inflammation in the cortex and peritubular capillaries.
Conclusions
This study confirmed the diagnostic value and potential usefulness of gallium-67 scintigraphy for evaluating interstitial nephritis.
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Data availability
The data underlying this article may be available on reasonable request to the corresponding author.
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Acknowledgements
We would like to thank the hospital and laboratory staff for supporting this study. This study was not funded by any commercial, private, or not-for-profit sectors.
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MM, AO, HY, MS, AS, and HT developed the study concept and design. MM, HY, and MS participated in data acquisition. MM, HY, and AO performed the statistical analysis. MM, AO, and AS interpreted the data. MM and AO drafted the manuscript. AS, TT, MN, and HT critically revised the work for important intellectual content. All authors read and approved the final version of the manuscript.
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Matsumura, M., Okada, A., Yokoyama, H. et al. Usefulness of gallium-67 scintigraphy for evaluating the histopathological activity in interstitial nephritis. Clin Exp Nephrol 27, 251–261 (2023). https://doi.org/10.1007/s10157-022-02302-0
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DOI: https://doi.org/10.1007/s10157-022-02302-0