ArticleEBioMedicine2026
Individualised treatment effects of corticosteroids in IgA nephropathy.
Article in EBioMedicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundIgA nephropathy (IgAN) has diverse clinical presentations and responses to treatment. For systemic corticosteroids in particular, randomised controlled trials have reported conflicting effects, highlighting the need for individualised treatment strategies.
methodsIn this retrospective cohort study, we derived and validated a causal machine learning (ML) framework to estimate individualised corticosteroid treatment effects in IgAN. Eight international cohorts, including the VALIGA, CureGN, and NURTuRE-CKD repositories, comprising 1022 patients, were analysed (derivation, n = 464; validation, n = 558). We integrated baseline clinical data, histopathological classification scores (MEST-C), and deep learning-based histomorphological biomarkers (pathomics) from digitised kidney biopsies. The framework estimated the effect of systemic corticosteroids on the composite endpoint of a ≥50% decline in estimated glomerular filtration rate or kidney failure within five years of biopsy.
findingsAcross the overall study population, systemic corticosteroid therapy was not associated with a significant improvement in the composite outcome (p = 0·27). However, the causal ML framework revealed substantial treatment heterogeneity, identifying patients with high predicted benefit who achieved longer progression-free survival with corticosteroids (0·43 years, 95% CI 0·18-0·73, p < 0·01), while no benefit was observed in those with low predicted benefit (-0·005 years, 95% CI -0·3 to 0·22, p > 0·05). An individualised framework-guided treatment assignment was estimated to reduce systemic corticosteroid use by 60·7%. Pathomics facilitated the identification of interstitial inflammation and tubulitis as key features of corticosteroid response.
interpretationThis study demonstrates that a causal ML framework integrating clinical, histopathological, and pathomics predictors can individualise treatment assignments for systemic corticosteroids in IgAN. This approach provides a blueprint for precision therapy in IgAN, supporting AI-enhanced clinical decision-making in the era of emerging targeted treatments.
fundingGerman Research Foundation; European Research Council; German Federal Ministry of Education and Research; German Innovation Fund of the Federal Joint Committee; Clinician Scientist Program of the Faculty of Medicine RWTH Aachen University.
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