ArticleJournal of pathology and translational medicine2026
Significance of KM55 immunohistochemical staining in the diagnosis and prognosis of IgA nephropathy.
Article in Journal of pathology and translational medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- IgA Nephropathy: Mechanisms, Risk Stratification, and Precision Therapy.Diagnostics (Basel, Switzerland) · 2026Review
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Abstract
backgroundGalactose-deficient IgA1 (Gd-IgA1) plays a crucial role in IgA nephropathy (IgAN). The monoclonal antibody KM55 has emerged as a simplified method for detecting Gd-IgA1; however, the clinicopathological significance of immunohistochemistry for Gd-IgA1 remains underexplored. This study evaluated the prognostic and clinicopathological significance of KM55 immunohistochemistry in IgAN.
methodsA total of 114 native kidney biopsies showing at least mild mesangial IgA positivity on immunofluorescence were retrospectively analyzed. Patients were categorized as having IgAN or non-IgAN diseases. The KM55 immunohistochemical staining was graded as 0, 1+, 2+, 3, or 4+. Data on Oxford classification, laboratory parameters, and renal outcomes were collected.
resultsThe IgAN group showed significantly higher KM55 scores than the non-IgAN group (median: 3 vs. 1; p < .001). IgAN cases were further stratified into KM55-high (≥3+, n = 38) and -low groups (≤2+, n = 37). The KM55-high group had significantly higher diastolic blood pressure, blood urea nitrogen, creatinine, urine protein/creatinine ratio, and Oxford mesangial hypercellularity scores, along with lower estimated glomerular filtration rate (eGFR) and serum albumin. Cox analysis revealed significantly poorer outcomes in the KM55-high group for chronic kidney disease stage 4 (p = .015), end-stage renal disease (p = .024), and 75% eGFR decline (p = .016).
conclusionsMesangial Gd-IgA1 deposition graded by KM55 immunohistochemistry may be a useful adjunct for IgAN diagnosis and a potential prognostic biomarker.
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