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Is There a Place for Apheresis in the Management of Idiopathic Membranous Nephropathy? A Report of Three Cases and Literature Review.
Journal of Personalized Medicine 2024 Februrary 27
Membranous nephropathy constitutes approximately 20% of adult nephrotic syndrome cases. In approximately 80% of cases, membranous nephropathy is primary, mediated by IgG autoantibodies primarily targeting podocyte antigens (PLA2R, THSD7A, etc.). The treatment involves a combination of corticosteroids and cyclophosphamide or anti-CD20-based therapies, e.g., rituximab. In the event of significant proteinuria and in order to avoid the urinary elimination of rituximab, therapeutic apheresis, in particular semi-specific immunoadsorption, may be an option allowing for a reduction in proteinuria and autoantibodies before initiating treatment with rituximab. We present the preliminary experience of three patients treated with semi-specific immunoadsorption for primary membranous nephropathy between January 2021 and March 2023. Two patients were anti-PLA2R-autoantibody-positive and one was seronegative. The average age was 59 ± 17 years. Semi-specific immunoadsorption did not reduce albuminuria, but it, nevertheless, led to an increase in serum albumin, contributing to the regression of edema. It effectively eliminated anti-PLA2R autoantibodies in the two anti-PLA2R-positive patients. Consequently, apheresis may not induce a rapid reduction in proteinuria, but could contribute to a more accelerated remission when combined with the anti-CD20 treatment.
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