Efficacy of corticosteroid therapy for IgA nephropathy patients stratified by kidney function and proteinuria
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ORIGINAL ARTICLE
Efficacy of corticosteroid therapy for IgA nephropathy patients stratified by kidney function and proteinuria Yasuyuki Nagasawa1 · Ryohei Yamamoto2 · Maki Shinzawa3 · Tatsuya Shoji4 · Yukiko Hasuike1 · Katsuyuki Nagatoya5 · Atsushi Yamauchi5 · Terumasa Hayashi4 · Takayuki Kuragano1 · Toshiki Moriyama2 · Yoshitaka Isaka3 Received: 8 November 2019 / Accepted: 11 June 2020 © Japanese Society of Nephrology 2020
Abstract Background Steroid therapy is one of the important therapies for IgA nephropathy (IgAN), but the features of the IgAN patients who have the benefit from this therapy remained unclear. Methods This retrospective observational study, using data of 874 patients with IgAN analyzed the proteinuria and kidney function of IgAN patients who had beneficial effect by steroid therapy. Two advantages of the present study were a large cohort and a long observational period. Results Corticosteroid therapy had ameliorated the kidney prognosis [incident rate ratio (IRR) 0.57 (95%CI 0.34–0.92), P = 0.029]. Because of interaction between kidney function and use of corticosteroid (P = 0.047), stratification analysis by kidney function revealed that prognosis of kidney function in IgAN patients whose eGFR was less than 60 ml/min/1.73m2 was ameliorated by corticosteroid therapy [IRR 0.50 (95%CI 0.26–0.97), P = 0.015); while, there was no change of kidney prognosis in IgAN patients whose eGFR was above 60 ml/min/1.73 m2. To make the target of corticosteroid therapy for IgAN patients more clear, IgAN patients, whose eGFR were less than 60 ml/min/1.73 m2, were stratified by proteinuria (1 g/ day). In IgAN patients whose eGFR were under 60 ml/min/1.73 m2 and whose proteinuria were over 1.0 g/day, corticosteroid therapy seemed to ameliorate kidney function [IRR 0.39 (95%CI 0.19–0.86), P
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