ArticleClinical kidney journal2026
Long-term eculizumab treatment failure in C3 glomerulonephritis: two case reports.
Article in Clinical kidney journal, 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
C3 glomerulonephritis (C3GN) is a rare kidney disease driven by dysregulation of the alternative complement pathway. We report two challenging cases of patients with C3GN in whom various immunosuppressant therapies have failed to achieve complete remission, prompting treatment with eculizumab, an anti-C5 humanized monoclonal antibody that inhibits the terminal complement pathway. Although transient improvement in kidney function was observed, both patients eventually experienced worsening renal parameters, with increasing proteinuria and hematuria, culminating in progression to end-stage kidney disease. Repeated kidney biopsies following eculizumab therapy demonstrated persistent, granular mesangial and capillary wall C3 (3+) staining on immunofluorescence studies, indicating ongoing complement activation upstream of the C5 blockade and the perpetuation of C3 deposits in the glomeruli. These cases underscore the limited efficacy of terminal complement inhibition in halting disease progression in C3GN.
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