Abstract
Background
C3 glomerulopathy (C3G) is characterized by heterogeneous clinical presentation, outcome, and predominant C3 accumulation in glomeruli without significant IgG. There is scarce outcome data regarding childhood C3G. We describe clinical and pathological features, treatment and outcomes, and risk factors for progression to chronic kidney disease stage 5 (CKD5) in the largest pediatric series with biopsy-proven C3G.
Methods
Sixty pediatric patients with C3G from 21 referral centers in Turkey were included in this retrospective study. Patients were categorized according to CKD stage at last visit as CKD5 or non-CKD5. Demographic data, clinicopathologic findings, treatment, and outcome data were compared and possible risk factors for CKD5 progression determined using Cox proportional hazards model.
Results
Mean age at diagnosis was 10.6 ± 3.0 years and follow-up time 48.3 ± 36.3 months. Almost half the patients had gross hematuria and hypertension at diagnosis. Nephritic-nephrotic syndrome was the commonest presenting feature (41.6%) and 1/5 of patients presented with nephrotic syndrome. Membranoproliferative glomerulonephritis was the leading injury pattern, while 40 patients had only C3 staining. Patients with DDD had significantly lower baseline serum albumin compared with C3GN. Eighteen patients received eculizumab. Clinical remission was achieved in 68.3%. At last follow-up, 10 patients (16.6%) developed CKD5: they had lower baseline eGFR and albumin and higher frequency of nephrotic syndrome and dialysis requirement than non-CKD5 patients. Lower serum albumin and eGFR at diagnosis were independent predictors for CKD5 development.
Conclusions
Children with C3G who have impaired kidney function and hypoalbuminemia at diagnosis should be carefully monitored for risk of progression to CKD5.
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Acknowledgments
We would like to thank Prof. Ahmet Ozturk and Dr. Sumeyra Cicek Ozdemir who helped us in statistical analysis.
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A.S.P, I.D, and R.D designed the study. A.S.P, I.D, I.G, E.Ç, S.S, M.T.B, O.D, E.M, D.T, N.Ç. D.Y, S.A.B, Y.T, Z.Y.Y, E.B, M.K, A.S, N.C, B.A, M.E.Ç, M.T, M.B, G.Ö, and RD carried out the recruitment of patients into the study. I.D and A.S.P analyzed, interpreted the data, and wrote the article. All the authors reviewed and revised the article and approved the final version.
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The study protocol was approved by the local institutional Ethics Committee (2017/209).
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The authors declare that they have no competing interests and they have not received any funds or grants for this manuscript. The results presented in this paper have not been published previously in whole or part, except in abstract format.
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Pınarbaşı, A.S., Dursun, I., Gokce, I. et al. Predictors of poor kidney outcome in children with C3 glomerulopathy. Pediatr Nephrol 36, 1195–1205 (2021). https://doi.org/10.1007/s00467-020-04799-7
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DOI: https://doi.org/10.1007/s00467-020-04799-7