1. High incidence of proliferative and membranous nephritis in SLE patients with low proteinuria in the Accelerating Medicines Partnership.
- Author
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Carlucci, Philip M, Li, Jessica, Fava, Andrea, Deonaraine, Kristina K, Wofsy, David, James, Judith A, Putterman, Chaim, Diamond, Betty, Davidson, Anne, Fine, Derek M, Monroy-Trujillo, Jose, Atta, Mohamed G, DeJager, Wade, Guthridge, Joel M, Haag, Kristin, Rao, Deepak A, Brenner, Michael B, Lederer, James A, Apruzzese, William, and Belmont, H Michael
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LUPUS nephritis , *BIOPSY , *DISEASE incidence , *HEALTH outcome assessment , *T-test (Statistics) , *PEARSON correlation (Statistics) , *PROTEINURIA , *CHI-squared test , *DESCRIPTIVE statistics , *SYSTEMIC lupus erythematosus , *ETHNIC groups , *HISTOLOGY , *LONGITUDINAL method , *CREATININE - Abstract
Objective Delayed detection of LN associates with worse outcomes. There are conflicting recommendations regarding a threshold level of proteinuria at which biopsy will likely yield actionable management. This study addressed the association of urine protein:creatinine ratios (UPCR) with clinical characteristics and investigated the incidence of proliferative and membranous histology in patients with a UPCR between 0.5 and 1. Methods A total of 275 SLE patients (113 first biopsy, 162 repeat) were enrolled in the multicentre multi-ethnic/racial Accelerating Medicines Partnership across 15 US sites at the time of a clinically indicated renal biopsy. Patients were followed for 1 year. Results At biopsy, 54 patients had UPCR <1 and 221 had UPCR ≥1. Independent of UPCR or biopsy number, a majority (92%) of patients had class III, IV, V or mixed histology. Moreover, patients with UPCR <1 and class III, IV, V, or mixed had a median activity index of 4.5 and chronicity index of 3, yet 39% of these patients had an inactive sediment. Neither anti-dsDNA nor low complement distinguished class I or II from III, IV, V or mixed in patients with UPCR <1. Of 29 patients with baseline UPCR <1 and class III, IV, V or mixed, 23 (79%) had a UPCR <0.5 at 1 year. Conclusion In this prospective study, three-quarters of patients with UPCR <1 had histology showing class III, IV, V or mixed with accompanying activity and chronicity despite an inactive sediment or normal serologies. These data support renal biopsy at thresholds lower than a UPCR of 1. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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