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  • Title: Complete remission of DnaJ homolog subfamily B member 9-positive fibrillary glomerulonephritis following steroid monotherapy in an elderly Japanese woman.
    Author: Uchida T, Komatsu S, Sakai T, Kojima A, Iwama S, Sugisaki K, Oda T.
    Journal: CEN Case Rep; 2021 Aug; 10(3):442-447. PubMed ID: 33656648.
    Abstract:
    A 74-year-old Japanese woman was referred to our department because of anasarca and massive proteinuria. She was clinically diagnosed with nephrotic syndrome, and renal biopsy showed membranoproliferative glomerulonephritis accompanied by marked glomerular infiltration with macrophages and full-house immunofluorescence glomerular deposition. Furthermore, randomly arranged nonbranching fibrils, approximately 12 nm in diameter, were found by electron microscopy, and immunostaining for DnaJ homolog subfamily B member 9 (DNAJB9), a recently identified diagnostic biomarker of fibrillary glomerulonephritis (FGN), showed positive result, thereby confirming the diagnosis of FGN. Steroid treatment was initiated, and she obtained complete remission of nephrotic syndrome and has maintained it. FGN is an uncommon form of glomerular disease, and reported cases of DNAJB9-positive FGN among Asians, particularly among Japanese population, are rare. There have been no established therapeutic regimens and its renal prognosis is generally unfavorable. The present case suggests that some patients with FGN can achieve favorable clinical outcomes through steroid monotherapy.
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