Abstract | RATIONALE & OBJECTIVE: STUDY DESIGN: Individual patient-level meta-analysis. SETTING & STUDY POPULATIONS: Individual data of 1,037 patients from 12 randomized trials. SELECTION CRITERIA FOR STUDIES: Randomized trials of IgAN with proteinuria measurements at baseline and 6 (range, 2.5-14) months and at least a further 1 year of follow-up for the clinical outcome. ANALYTICAL APPROACH: For each trial, we estimated the treatment effects on proteinuria and on the eGFR slope, computed as the total slope starting at baseline or the chronic slope starting 3 months after randomization. We used a Bayesian mixed-effects analysis to relate the treatment effects on proteinuria to effects on GFR slope across these studies and developed a prediction model for the treatment effect on the GFR slope based on the effect on proteinuria. RESULTS: Across all studies, treatment effects on proteinuria accurately predicted treatment effects on the total slope at 3 years (median R2 = 0.88; 95% Bayesian credible interval [ BCI], 0.06-1) and on the chronic slope (R2 = 0.98; 95% BCI, 0.29-1). For future trials, an observed treatment effect of approximately 30% reduction in proteinuria would confer probabilities of at least 90% for nonzero treatment benefits on the total and chronic slopes of eGFR. We obtained similar results for proteinuria at 9 and 12 months and total slope at 2 years. LIMITATIONS: Study population restricted to 12 trials of small sample size, leading to wide BCIs. There was heterogeneity among trials with respect to study design and interventions. CONCLUSIONS:
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Authors | Lesley A Inker, Hiddo J L Heerspink, Hocine Tighiouart, Juhi Chaudhari, Shiyuan Miao, Ulysses Diva, Alex Mercer, Gerald B Appel, James V Donadio, Jürgen Floege, Philip K T Li, Bart D Maes, Francesco Locatelli, Manuel Praga, Francesco P Schena, Andrew S Levey, Tom Greene |
Journal | American journal of kidney diseases : the official journal of the National Kidney Foundation
(Am J Kidney Dis)
Vol. 78
Issue 3
Pg. 340-349.e1
(09 2021)
ISSN: 1523-6838 [Electronic] United States |
PMID | 33775708
(Publication Type: Journal Article, Meta-Analysis, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Review)
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Copyright | Copyright © 2021 National Kidney Foundation, Inc. Published by Elsevier Inc. All rights reserved. |
Chemical References |
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Topics |
- Bayes Theorem
- Creatinine
(metabolism)
- Disease Management
- Disease Progression
- Glomerular Filtration Rate
(physiology)
- Glomerulonephritis, IGA
(physiopathology, therapy, urine)
- Humans
- Research Design
- Urinalysis
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