title: The Usefulness of Phospholipase A2 Receptor and IgG4 Detection in Differentiation Primary Membranous Nephropathy From Secondary Membranous Nephropathy in Renal Biopsy.
abstract: Membranous nephropathy (MGN) is the most common cause of the nephrotic syndrome in adults. Most cases of MGN are primary, but secondary MGN are frequently encountered. Determination of secondary MGN is crucial for initiation of appropriate treatment. The diagnostic performance of the phospholipase A2 receptor (PLA2R) and immunoglobulin G4 (IgG4) detection based on immunohistochemistry were evaluated using biopsy tissues of 59 primary and 56 secondary MGN cases for discrimination between primary MGN and secondary MGN. The PLA2R and IgG4 detection based on immunohistochemistry were dominantly positive in primary MGN cases. Sensitivity and specificity values for identification of primary MGN were 83% and 88% for PLA2R, and 76% and 86% for IgG4. Both PLA2R and IgG4 positivity showed a high specificity of 96.4% for identifying primary MGN. A meta-analysis was performed for analysis of the diagnostic accuracy of histologic PLA2R and IgG4 deposition for differentiation of primary from secondary MGN. The overall sensitivity, specificity, and area under curve of summary receiver operating characteristics were 76%, 86%, 0.93 for histologic PLA2R deposition, and 80%, 69%, 0.82 for histologic IgG4 deposition. PLA2R and IgG4 detection based on immunohistochemistry can be useful for differentiation of primary MGN from secondary MGN.
authors.affiliation: Department of Pathology, Chungnam National University School of Medicine.
authors.forename: Min-Kyung
authors.initials: MK
authors.lastname: Yeo
authors.affiliation: Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Republic of Korea.
authors.forename: Yoo Hyung
authors.initials: YH
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Republic of Korea.
authors.forename: Dae Eun
authors.initials: DE
authors.lastname: Choi
authors.affiliation: Department of Pathology, Chungnam National University School of Medicine.
authors.forename: Song-Yi
authors.initials: SY
authors.lastname: Choi
authors.affiliation: Department of Pathology, Chungnam National University School of Medicine.
authors.forename: Kyung-Hee
authors.initials: KH
authors.lastname: Kim
authors.affiliation: Department of Pathology, Chungnam National University School of Medicine.
authors.forename: Kwang-Sun
authors.initials: KS
authors.lastname: Suh
mesh_terms: D000328:Adult; D000368:Aged; D001706:Biopsy; D003937:Diagnosis, Differential; D005260:Female; D015433:Glomerulonephritis, Membranous / Q000175:diagnosis / Q000378:metabolism / Q000473:pathology; D006801:Humans; D007074:Immunoglobulin G / Q000378:metabolism*; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D054507:Receptors, Phospholipase A2 / Q000378:metabolism*; D012680:Sensitivity and Specificity
chemical_list: D007074:Immunoglobulin G; C516360:PLA2R1 protein, human; D054507:Receptors, Phospholipase A2