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Differential Diagnosis of Lupus and Primary Membranous Nephropathies by IgG Subclass Analysis

Title
Differential Diagnosis of Lupus and Primary Membranous Nephropathies by IgG Subclass Analysis
Author
김근호
Keywords
GLOMERULONEPHRITIS; NEPHRITIS; IDENTIFICATION; ERYTHEMATOSUS; DEPOSITS; DISEASE; HEALTH
Issue Date
2012-12
Publisher
AMERICAN SOCIETY OF NEPHROLOGY
Citation
CLINICAL JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY, 2012 ,7(12), P.1947-1955, 9P.
Abstract
Background and objectives Previous studies showed that the accuracy of IgG subclasses (ISs) in differentiating membranous lupus nephritis (MLN) from primary membranous nephropathy (PMN) is <80%. This study hypothesized that diagnostic accuracy of ISs would be increased if renal compartment measurements and decision tree analysis are applied. Design, setting, participants, & measurements Renal biopsy specimens from 41 patients with MLN and 59 patients with PMN between October 2004 and March 2010 were examined, and immunofluorescence staining against lgGl, IgG2, IgG3, and IgG4 as well as C3, C1q, and C4 was evaluated in five different renal compartments (glomerular capillary walls, mesangium, tubules, interstitium, and blood vessels). From IS data, a decision tree to differentiate MLN from PMN was produced (IS decision tree) and its accuracy was compared with that of previous studies. Diagnostic accuracy of the IS decision tree was also compared with that of the complement decision tree as a reference. Results The demographic information and patterns of IS deposition were similar to those of previous studies. The IS decision tree had, as decision markers, IgG1 in the mesangium and IgG2 and IgG4 along the glomerular capillary wall. The IS decision tree showed higher accuracy (88%) than that of previous studies (<80%) and also that of the complement decision tree (81%). Conclusions Accuracy of ISs was increased due to the study methods, but the same methodology was less effective using complement measurements. Appropriate data analysis may enhance diagnostic value, but the analysis alone cannot achieve the ideal diagnostic value. Chit J Am Soc Nephrol 7: 1947-1955, 2012. doi: 10.2215/CJN.04800511
URI
http://cjasn.asnjournals.org/content/7/12/1947http://hdl.handle.net/20.500.11754/48652
ISSN
1555-9041
DOI
10.2215/CJN.04800511
Appears in Collections:
COLLEGE OF MEDICINE[S](의과대학) > MEDICINE(의학과) > Articles
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