Early Experience With Iptacopan for Recurrent IgA Nephropathy After Kidney Transplantation.

Immunoglobulin A (IgA) nephropathy is a common cause of kidney failure and can recur after kidney transplantation, increasing the risk of allograft loss. Effective treatments for recurrent IgA nephropathy in kidney transplant recipients are urgently needed. Iptacopan is a complement factor B inhibitor that received accelerated approval by the US Food and Drug Administration in August 2024 for the treatment of high-risk native IgA nephropathy based on trials that excluded transplant recipients. In this case series, we report our early experience with iptacopan in three individuals with biopsy-confirmed recurrent IgA nephropathy after kidney transplant. All received iptacopan for ≥3 months in combination with a short course of systemic corticosteroids. Two individuals demonstrated significant reductions in proteinuria and resolution of microscopic hematuria. One individual developed progressive graft dysfunction; repeat biopsy showed persistent active glomerulonephritis with codeposition of IgG, suggesting a more aggressive or atypical disease phenotype. These early data suggest that iptacopan, in combination with short-term corticosteroids, may offer therapeutic benefit in selected kidney transplant recipients with recurrent IgA nephropathy, warranting further investigation.