1
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Cohen A, Weerasinghe N, Lemmert K, de Malmanche T, Myint T. Diagnostic accuracy of ANCA serology in ANCA-associated vasculitis with renal involvement. Intern Med J 2024; 54:1497-1505. [PMID: 38873696 DOI: 10.1111/imj.16436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 05/18/2024] [Indexed: 06/15/2024]
Abstract
BACKGROUND Pauci-immune glomerulonephritis (GN) due to antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV) is a common cause of crescentic GN. Despite advances in treatment, rates of mortality and progression to end-stage kidney disease remain high. Renal involvement is diagnosed by histological examination of kidney tissue. Serum ANCAs play a significant role in AAV; however, the value of serum ANCA quantification to predict renal involvement is not well-established. AIM We aimed to evaluate the diagnostic accuracy of serum ANCA titres in diagnosing AAV with renal involvement. METHODS We conducted a retrospective study of consecutive native kidney biopsies reported at our centre from 2016 to 2021. We included all adults who had both a kidney biopsy and ANCA serology. ANCA serology was tested using indirect immunofluorescence with reporting of titres. Antibodies to proteinase 3 and myeloperoxidase were measured using a chemiluminescent immunoassay. RESULTS Eight hundred and forty-eight native kidney biopsies were reported during the study period. Five hundred and seven cases were included. The biopsy prevalence of pauci-immune GN in paired samples was 41/507 (8.1%). Most of the cohort had haematuria (66.6%), proteinuria (93.4%) and/or acute kidney injury (65.0%). A positive ANCA at any titre demonstrated a sensitivity of 97.6% and a specificity of 71.2% for a diagnosis of pauci-immune GN. The area under the curve for the receiver operator characteristic was 0.93 (95% confidence interval [CI]: 0.89-0.97). A cutoff ANCA titre of 1:160 provided the optimum balance between a sensitivity of 75.6% (95% CI: 59.7%-87.6%) and a specificity of 94.0% (95% CI: 91.6%-96.0%). CONCLUSIONS ANCA titres are highly predictive of pauci-immune GN in the appropriate context. While serum ANCA quantitation may not replace renal biopsy, reporting will assist in the decision to start treatment early for patients with organ or life-threatening disease.
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Affiliation(s)
- Adrienne Cohen
- Department of Nephrology and Renal Transplant, John Hunter Hospital, Newcastle, New South Wales, Australia
| | - Nethmi Weerasinghe
- Department of Nephrology and Renal Transplant, John Hunter Hospital, Newcastle, New South Wales, Australia
| | - Karla Lemmert
- NSW Health Pathology, Immunology, Newcastle, New South Wales, Australia
| | - Theo de Malmanche
- NSW Health Pathology, Immunology, Newcastle, New South Wales, Australia
- School of Medicine and Public Health, Newcastle University, Newcastle, New South Wales, Australia
| | - Thida Myint
- Department of Nephrology and Renal Transplant, John Hunter Hospital, Newcastle, New South Wales, Australia
- School of Medicine and Public Health, Newcastle University, Newcastle, New South Wales, Australia
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2
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Walker BS, Peterson LK, Koening C, White SK, Schmidt RL, Tebo AE. Performance of MPO-ANCA and PR3-ANCA immunoassays for the stratification of specific ANCA-associated vasculitis: A systematic review and meta-analysis. Autoimmun Rev 2022; 21:103100. [PMID: 35452854 DOI: 10.1016/j.autrev.2022.103100] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Accepted: 04/18/2022] [Indexed: 11/16/2022]
Abstract
OBJECTIVE To determine the impact of myeloperoxidase (MPO) and proteinase 3 (PR3) antigen-specific immunoassays in the stratification of patients at-risk for anti-neutrophil cytoplasmic antibodies (ANCA)-associated vasculitides (AAV) at diagnosis. METHODS A Medline search was conducted to identify diagnostic accuracy studies using PR3-ANCA or MPO-ANCA for the evaluation of granulomatosis with polyangiitis (GPA), microscopic polyangiitis (MPA), and eosinophilic granulomatosis with polyangiitis (EGPA). Studies estimates were pooled using the bivariate method. RESULTS Diagnostic accuracy varied by analyte and AAV subtype. PR3-ANCA had greater sensitivity than MPO-ANCA for GPA (74% vs 11%, p < 0.001) and MPO-ANCA greater sensitivity for MPA (73% vs 7%, p < 0.001). Specificities of both MPO-ANCA and PR3-ANCA were consistently high (mean 97%, range: 93-99%) for both AAV subtypes. There was insufficient data to perform meta-analysis for the diagnostic accuracy of EPGA. CONCLUSION These results validate the use of high quality MPO-ANCA and PR3-ANCA immunoassays to screen patients at-risk for AAV as well as to categorize disease as GPA or MPA subtype. However, caution must be exercised in doing so, since some assays may not have optimal performance. Each laboratory should validate appropriate algorithms based on the tests used and testing population.
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Affiliation(s)
| | - Lisa K Peterson
- ARUP Laboratories, Salt Lake City, UT, United States of America; Department of Pathology, University of Utah, Salt Lake City, UT, United States of America
| | - Curry Koening
- Department of Internal Medicine, Division of Rheumatology, University of Utah, Salt Lake City, UT, United States of America
| | - Sandra K White
- Department of Pathology, University of Utah, Salt Lake City, UT, United States of America
| | - Robert L Schmidt
- ARUP Laboratories, Salt Lake City, UT, United States of America; Department of Pathology, University of Utah, Salt Lake City, UT, United States of America
| | - Anne E Tebo
- ARUP Laboratories, Salt Lake City, UT, United States of America; Department of Pathology, University of Utah, Salt Lake City, UT, United States of America.
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3
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Brunetta E, Ramponi G, Folci M, De Santis M, Morenghi E, Vanni E, Bredi E, Furlan R, Angelini C, Selmi C. Serum ANCA and Overall Mortality: A 10-Year Retrospective Cohort Study on 1,024 Italian Subjects. Front Immunol 2021; 12:714174. [PMID: 34566970 PMCID: PMC8461098 DOI: 10.3389/fimmu.2021.714174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 08/17/2021] [Indexed: 11/14/2022] Open
Abstract
Background Antineutrophil cytoplasmic antibodies (ANCA) are primarily involved in the pathogenesis of ANCA-associated vasculitides (AAV). However, ANCA may also be present in healthy subjects and in patients with autoimmune disorders different from AAV. We hypothesized that serum ANCA are associated with a worse prognosis in disorders other than AAV. Objective We investigated the association between the overall survival and the presence of serum ANCA in 1,024 Italian subjects with various testing indications in a 10-year interval. Methods In this retrospective cohort study, a population of 6,285 patients (many of whom were subsequently excluded due to our criteria) who tested for ANCA at a single center in 10 years was considered, and life status and comorbidities of subjects were collected. We compared the overall survival of ANCA-positive and ANCA-negative patients by means of Kaplan-Meier curves, while a multivariable adjusted Cox regression was used to evaluate the association between the ANCA status and the outcome (death) in terms of hazard ratios (HR) with 95% confidence intervals (CI). Results The positivity of perinuclear ANCA (pANCA) increased significantly mortality (HR, 1.60; 95% CI, 1.10–2.32), while cytoplasmic ANCA (cANCA) positivity failed to show a significant association (HR, 1.43; 95% CI, 0.77–2.68). The increased mortality rate was observed for both pANCA and cANCA in patients suffering from rheumatic disorders. No association was found between mortality and anti-MPO (HR, 0.63; 95% CI, 0.20–2.00) or anti-PR3 (HR, 0.98; 95% CI, 0.24–3.96) after adjusting for confounders. Conclusions Serum pANCA and cANCA are independent negative prognostic factors in patients with concurrent autoimmune diseases.
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Affiliation(s)
- Enrico Brunetta
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | | | - Marco Folci
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | - Maria De Santis
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy.,Unit of Rheumatology and Clinical Immunology, IRCCS Humanitas Research Hospital, Rozzano, Italy
| | - Emanuela Morenghi
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | - Elena Vanni
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | - Elena Bredi
- IRCCS Humanitas Research Hospital, Rozzano, Italy
| | - Raffaello Furlan
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | - Claudio Angelini
- IRCCS Humanitas Research Hospital, Rozzano, Italy.,Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy
| | - Carlo Selmi
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Italy.,Unit of Rheumatology and Clinical Immunology, IRCCS Humanitas Research Hospital, Rozzano, Italy
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4
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Guchelaar NAD, Waling MM, Adhin AA, van Daele PLA, Schreurs MWJ, Rombach SM. The value of anti-neutrophil cytoplasmic antibodies (ANCA) testing for the diagnosis of ANCA-associated vasculitis, a systematic review and meta-analysis. Autoimmun Rev 2020; 20:102716. [PMID: 33197574 DOI: 10.1016/j.autrev.2020.102716] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 06/19/2020] [Indexed: 12/24/2022]
Abstract
The testing of anti-neutrophil cytoplasmic antibodies (ANCA) takes an important place in the diagnostic workup to ANCA-associated vasculitis (AAV). Nowadays, it is recommended to screen for the presence of PR3 and MPO specific antibodies first using immunoassay, without the need for ANCA measurement by indirect immunofluorescence (IIF). A literature search was performed to assess the diagnostic test value of ANCA IIF and PR3- and MPO-antibody immunoassay to diagnose AAV. This meta-analysis shows that the c-ANCA testing by IIF has a pooled sensitivity of 75.2% and a pooled specificity of 98.4%. For PR3-antibody immunoassay, the pooled sensitivity depended on the immunoassay method used, and ranged from 79.8% to 86.6%, whereas the pooled specificity ranged from 96.8% to 98.3%. For both p-ANCA IIF and MPO-antibody immunoassay (all methods) sensitivity varied considerably showing pooled values of respectively 46.3% and 58.1%, whereas respective pooled specificity was 91.4% and 95.6%. These findings support the 2017 international consensus that primary anti-PR3 and anti-MPO screening by immunoassay, based on superior immunoassay sensitivity without the need for IIF ANCA testing, improves the diagnostic workup of AAV.
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Affiliation(s)
- Niels A D Guchelaar
- Department of Internal Medicine, Allergy and Clinical Immunology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Manon M Waling
- Department of Internal Medicine, Allergy and Clinical Immunology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Anviti A Adhin
- Department of Internal Medicine, Allergy and Clinical Immunology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Paul L A van Daele
- Department of Internal Medicine, Allergy and Clinical Immunology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Marco W J Schreurs
- Department of Immunology, Laboratory Medical Immunology, Erasmus MC University Medical Center, Rotterdam, the Netherlands
| | - Saskia M Rombach
- Department of Internal Medicine, Allergy and Clinical Immunology, Erasmus MC University Medical Center, Rotterdam, the Netherlands.
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5
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Schirmer JH, Aries PM, de Groot K, Hellmich B, Holle JU, Kneitz C, Kötter I, Lamprecht P, Müller-Ladner U, Reinhold-Keller E, Specker C, Zänker M, Moosig F. [S1 guidelines Diagnostics and treatment of ANCA-associated vasculitis]. Z Rheumatol 2019; 76:77-104. [PMID: 29204681 DOI: 10.1007/s00393-017-0394-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Jan Henrik Schirmer
- Klinik für Innere Medizin I, Universitätsklinikum Schleswig-Holstein, Campus Kiel, Arnold-Heller-Str. 3, 24105, Kiel, Deutschland.
| | - Peer M Aries
- Rheumatologie im Struenseehaus, Hamburg, Deutschland
| | - Kirsten de Groot
- Medizinische Klinik III, Sana Klinikum Offenbach, Offenbach, Deutschland
- KfH Nierenzentrum Offenbach, Offenbach, Deutschland
| | - Bernhard Hellmich
- Klinik für Innere Medizin, Rheumatologie und Immunologie, Vaskulitiszentrum Süd, Medius Klinik Kirchheim, Kirchheim, Deutschland
| | - Julia U Holle
- Rheumazentrum Schleswig-Holstein Mitte, Neumünster, Deutschland
| | - Christian Kneitz
- Klinik für Innere Medizin II, Rheumatologie, klinische Immunologie und Geriatrie, Klinikum Südstadt, Rostock, Deutschland
| | - Ina Kötter
- Abteilung für Rheumatologie, klinische Immunologie und Nephrologie, Asklepios Klinikum Altona, Hamburg, Deutschland
| | - Peter Lamprecht
- Klinik für Rheumatologie und klinische Immunologie, Universität zu Lübeck, Lübeck, Deutschland
| | - Ulf Müller-Ladner
- Abteilung für Rheumatologie und Klinische Immunologie, Campus Kerckhoff, Justus-Liebig Universität Giessen, Bad Nauheim, Deutschland
| | - Eva Reinhold-Keller
- Klinik für Rheumatologie und klinische Immunologie, Klinikum Bad Bramstedt, Bad Bramstedt, Deutschland
| | - Christof Specker
- Klinik für Rheumatologie und klinische Immunologie, Universitätsmedizin Essen, St. Josef Krankenhaus Werden, Essen, Deutschland
| | - Michael Zänker
- Abteilung für Innere Medizin, Immanuel Klinikum Bernau Herzzentrum Brandenburg, Bernau, Deutschland
- Medizinische Hochschule Brandenburg, Neuruppin, Deutschland
| | - Frank Moosig
- Rheumazentrum Schleswig-Holstein Mitte, Neumünster, Deutschland
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6
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Savige J, Trevisin M, Pollock W. Testing and reporting antineutrophil cytoplasmic antibodies (ANCA) in treated vasculitis and non-vasculitic disease. J Immunol Methods 2018; 458:1-7. [DOI: 10.1016/j.jim.2018.02.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 02/22/2018] [Accepted: 02/22/2018] [Indexed: 12/23/2022]
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7
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Sowa M, Trezzi B, Hiemann R, Schierack P, Grossmann K, Scholz J, Somma V, Sinico RA, Roggenbuck D, Radice A. Simultaneous comprehensive multiplex autoantibody analysis for rapidly progressive glomerulonephritis. Medicine (Baltimore) 2016; 95:e5225. [PMID: 27858870 PMCID: PMC5591118 DOI: 10.1097/md.0000000000005225] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Rapidly progressive glomerulonephritis (RPGN) is mainly caused by anti-glomerular basement membrane (GBM) antibody-mediated glomerulonephritis, immune-complex or anti-neutrophil cytoplasmic antibody (ANCA)-associated vasculitides and leads to rapid loss of renal function. Detection of ANCA and autoantibodies (autoAbs) to GBM and dsDNA enables early diagnosis and appropriate treatment of RPGN aiding in preventing end-stage renal disease.Determination of ANCA on neutrophils (ANCA) as well as autoAbs to myeloperoxidase (MPO-ANCA), proteinase 3 (PR3-ANCA), GBM, and dsDNA was performed by the novel multiplex CytoBead technology combining cell- and microbead-based autoAb analyses by automated indirect immunofluorescence (IIF). Forty patients with granulomatosis with polyangiitis (GPA), 48 with microscopic polyangiitis (MPA), 2 with eosinophilic GPA, 42 with systemic lupus erythematosus (SLE), 43 with Goodpasture syndrome (GPS), 57 with infectious diseases (INF), and 55 healthy subjects (HS) were analyzed and findings compared with classical single testing.The CytoBead assay revealed for GPA, MPA, GPS, and SLE the following diagnostic sensitivities and for HS and INF the corresponding specificities: PR3-ANCA, 85.0% and 100.0%; MPO-ANCA, 77.1% and 99.1%; anti-GBM autoAb, 88.4% and 96.4%; anti-dsDNA autoAb, 83.3% and 97.3%; ANCA, 91.1% and 99.1%, respectively. Agreement with classical enzyme-linked immunosorbent assay and IIF was very good for anti-GBM autoAb, MPO-ANCA, PR3-ANCA, and ANCA, respectively. Anti-dsDNA autoAb comparative analysis demonstrated fair agreement only and a significant difference (P = 0.0001).The CytoBead technology provides a unique multiplex reaction environment for simultaneous RPGN-specific autoAb testing. CytoBead RPGN assay is a promising alternative to time-consuming single parameter analysis and, thus, is well suited for emergency situations.
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Affiliation(s)
- Mandy Sowa
- Research and Development Department, GA Generic Assays GmbH, Dahlewitz/Berlin, Germany
- Correspondence: Mandy Sowa, Medipan GmbH, Ludwig-Erhard-Ring 3, 15827 Dahlewitz, Germany (e-mail: )
| | - Barbara Trezzi
- Clinical Immunology, San Carlo Borromeo Hospital, Milan, Italy
| | - Rico Hiemann
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg
| | - Peter Schierack
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg
| | - Kai Grossmann
- Research and Development Department, GA Generic Assays GmbH, Dahlewitz/Berlin, Germany
| | - Juliane Scholz
- Research and Development Department, GA Generic Assays GmbH, Dahlewitz/Berlin, Germany
| | - Valentina Somma
- Research and Development Department, Medipan GmbH, Dahlewitz/Berlin, Germany
| | - Renato Alberto Sinico
- Department of Medicine and Surgery, Università degli Studi di Milano - Bicocca (School of Medicine and Surgery), via Cadore, 48 - 20900 Monza (MB)
| | - Dirk Roggenbuck
- Research and Development Department, GA Generic Assays GmbH, Dahlewitz/Berlin, Germany
- Institute of Biotechnology, Faculty Environment and Natural Sciences, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg
| | - Antonella Radice
- Microbiology Institute, San Carlo Borromeo Hospital, Milan, Italy
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8
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Damoiseaux J, Csernok E, Rasmussen N, Moosig F, van Paassen P, Baslund B, Vermeersch P, Blockmans D, Cohen Tervaert JW, Bossuyt X. Detection of antineutrophil cytoplasmic antibodies (ANCAs): a multicentre European Vasculitis Study Group (EUVAS) evaluation of the value of indirect immunofluorescence (IIF) versus antigen-specific immunoassays. Ann Rheum Dis 2016; 76:647-653. [PMID: 27481830 DOI: 10.1136/annrheumdis-2016-209507] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 07/12/2016] [Indexed: 12/22/2022]
Abstract
OBJECTIVE This multicentre study was performed to evaluate the diagnostic accuracy of a wide spectrum of novel technologies nowadays available for detection of myeloperoxidase (MPO) and proteinase 3 (PR3)-antineutrophil cytoplasmic antibodies (ANCAs). METHODS Sera (obtained at the time of diagnosis) from 251 patients with ANCA-associated vasculitis (AAV), including granulomatosis with polyangiitis and microscopic polyangiitis, and from 924 disease controls were tested for the presence of cytoplasmic pattern/perinuclear pattern and atypical ANCA (A-ANCA) by indirect immunofluorescence (IIF) (at two sites) and for the presence of PR3-ANCA and MPO-ANCA by eight different immunoassays. RESULTS The area under the curve (AUC) of the receiver operating characteristic curve to discriminate AAV from controls was 0.923 (95% CI 0.902 to 0.944) and 0.843 (95% CI 0.814 to 0.871) for the two IIF methods. For the antigen-specific immunoassays, the AUC varied between 0.936 (95% CI 0.912 to 0.960) and 0.959 (95% CI 0.941 to 0.976), except for one immunoassay for which the AUC was 0.919 (95% CI 0.892 to 0.945). CONCLUSIONS Our comparison of various ANCA detection methods showed (i) large variability between the two IIF methods tested and (ii) a high diagnostic performance of PR3-ANCA and MPO-ANCA by immunoassay to discriminate AAV from disease controls. Consequently, dual IIF/antigen-specific immunoassay testing of each sample is not necessary for maximal diagnostic accuracy. These results indicate that the current international consensus on ANCA testing for AAV needs revision.
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Affiliation(s)
- Jan Damoiseaux
- Central Diagnostic Laboratory, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Elena Csernok
- Department of Rheumatology and Immunology, Klinikum Bad Bramstedt, Bad Bramstedt, Germany
| | - Niels Rasmussen
- Department of Autoimmune Serology, Statens Seruminstitute, Copenhagen, Denmark
| | - Frank Moosig
- Rheumazentrum Schleswig-Holstein Mitte, Neumünster, Germany
| | - Pieter van Paassen
- Department of Internal Medicine, Section Nephrology and Immunology, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Bo Baslund
- Department of Rheumatology, Rigshospitalet, Copenhagen, Denmark
| | - Pieter Vermeersch
- Clinical Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium.,Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Daniel Blockmans
- Clinical Department of General Internal Medicine, Research Department of Microbiology and Immunology, Laboratory of Clinical Infectious and Inflammatory Disorders, University Hospitals Leuven, Leuven, Belgium
| | | | - Xavier Bossuyt
- Department of Microbiology and Immunology, KU Leuven, Leuven, Belgium.,Department of Laboratory Medicine, University Hospitals Leuven, Leuven, Belgium
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9
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Microscopic polyangiitis: Advances in diagnostic and therapeutic approaches. Autoimmun Rev 2015; 14:837-44. [PMID: 25992801 DOI: 10.1016/j.autrev.2015.05.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Accepted: 05/12/2015] [Indexed: 11/24/2022]
Abstract
Microscopic polyangiitis (MPA) is an idiopathic autoimmune disease characterized by systemic vasculitis. The disease predominantly affects small-calibre blood vessels and is associated with the presence of antineutrophil cytoplasmic autoantibodies (ANCA). Microscopic polyangiitis was considered to be a disease entity by Savage et al. in 1985. Microscopic polyangiitis has a reported low incidence and a slight male predominance. The aetiology of MPA remains unknown. There is, however, increased evidence that MPA is an autoimmune disease in which ANCAs, particularly those reacting with MPO, are pathogenic. MPA belongs to the systemic vasculitides, indicating that multiple organs can be affected. The major organs involved in MPA are the kidneys and the lungs. As expected for an illness that affects multiple organ systems, patients with MPA can present with a myriad of different symptoms. Ear, nose and throat (ENT) manifestations are not considered to be clinical symptoms of MPA, but in the majority of populations described, ENT involvement was found in surprisingly high percentages. MPA is part of the ANCA-associated vasculitides, which are characterized by necrotizing vasculitis of small vessels. Diagnosis is mainly established by clinical manifestations, computed tomography (TC), ANCA antibody detection and renal and pulmonary biopsy. The introduction of aggressive immunosuppressive treatment has substantially improved the prognosis. The standardized therapeutic regimen is based on cyclophosphamide and corticosteroids. Using this regimen, remission can be achieved in most of the patients. Rituximab may represent an important alternative to cyclophosphamide for patients who may not respond adequately to antimetabolite therapies.
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10
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Simultaneous automated screening and confirmatory testing for vasculitis-specific ANCA. PLoS One 2014; 9:e107743. [PMID: 25225805 PMCID: PMC4166465 DOI: 10.1371/journal.pone.0107743] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 08/14/2014] [Indexed: 11/19/2022] Open
Abstract
Anti-neutrophil cytoplasmic antibodies (ANCA) are the serological hallmark of small vessel vasculitis, so called ANCA-associated vasculitis. The international consensus requires testing by indirect immunofluorescence (IIF) on human ethanol-fixed neutrophils (ethN) as screening followed by confirmation with enzyme-linked immunosorbent assays (ELISAs). This study evaluates the combination of cell- and microbead-based digital IIF analysis of ANCA in one reaction environment by the novel multiplexing CytoBead technology for simultaneous screening and confirmatory ANCA testing. Sera of 592 individuals including 118 patients with ANCA-associated vasculitis, 133 with rheumatoid arthritis, 49 with infectious diseases, 77 with inflammatory bowel syndrome, 20 with autoimmune liver diseases, 70 with primary sclerosing cholangitis and 125 blood donors were tested for cytoplasmic ANCA (C-ANCA) and perinuclear ANCA (P-ANCA) by classical IIF and ANCA to proteinase 3 (PR3) and myeloperoxidase (MPO) by ELISA. These findings were compared to respective ANCA results determined by automated multiplex CytoBead technology using ethN and antigen-coated microbeads for microbead immunoassays. There was a good agreement for PR3- and MPO-ANCA and a very good one for P-ANCA and C-ANCA by classical and multiplex analysis (Cohen's kappa [κ] = 0.775, 0.720, 0.876, 0.820, respectively). The differences between classical testing and CytoBead analysis were not significant for PR3-ANCA, P-ANCA, and C-ANCA (p<0.05, respectively). The prevalence of confirmed positive ANCA findings by classical testing (IIF and ELISA) compared with multiplex CytoBead analysis (IIF and microbead immunoassay positive) resulted in a very good agreement (κ = 0.831) with no significant difference of both methods (p = 0.735). Automated endpoint-ANCA titer detection in one dilution demonstrated a very good agreement with classical analysis requiring dilution of samples (κ = 0.985). Multiplexing by CytoBead technology can be employed for simultaneous screening and quantitative confirmation of ANCA. This novel technique provides fast and cost-effective ANCA analysis by automated digital IIF for the first time.
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11
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Novel clinical and diagnostic aspects of antineutrophil cytoplasmic antibodies. J Immunol Res 2014; 2014:185416. [PMID: 24995343 PMCID: PMC4068101 DOI: 10.1155/2014/185416] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2014] [Accepted: 03/06/2014] [Indexed: 12/18/2022] Open
Abstract
Antineutrophil cytoplasmic antibodies (ANCA) are the serological hallmark of some idiopathic systemic vasculitides. Besides the investigation of ANCA-associated vasculitis (AAV) and constant effort for a standardized nomenclature and classification of the AAV, a main focus of research during the last few years has been to constantly improve the performance of enzyme immunoassays. With the latest so called third generation ELISA, this goal seemed to be fulfilled. The International Consensus Statement on Testing and Reporting of ANCA gave recommendations for standardized strategies for the serological diagnosis of ANCA. New developments now target the system immanent drawbacks of the respective diagnostic methods, be it the need for batching and the long time to result for ELISA, or the high likelihood of error and subjectivity of indirect immunofluorescence (IIF). Random access technology and multiplexing for solid phase assays as well as digital imaging for IIF are tools which may help to expedite and simplify routine diagnostics in the lab and in emergency settings. Recent findings indicate that PR3-ANCA have clinical utility beyond the diagnosis of AAV. PR3-ANCA can also serve as an aid for the differentiation between ulcerative colitis (UC) and Crohn's disease (CrD) and the stratification of UC patients. This review provides a detailed review of what is known about ANCA and highlights the latest research and state-of-the-art developments in this area.
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12
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Csernok E, Moosig F. Current and emerging techniques for ANCA detection in vasculitis. Nat Rev Rheumatol 2014; 10:494-501. [PMID: 24890776 DOI: 10.1038/nrrheum.2014.78] [Citation(s) in RCA: 98] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Detection of antineutrophil cytoplasmic antibodies (ANCAs) is a well-established diagnostic test used to evaluate suspected necrotizing vasculitis of small blood vessels. Conditions associated with these antibodies, collectively referred to as ANCA-associated vasculitides, include granulomatosis with polyangiitis (formerly known as Wegener granulomatosis), microscopic polyangiitis, and eosinophilic granulomatosis with polyangiitis (formerly known as Churg-Strauss syndrome). The diagnostic utility of ANCA testing depends on the type of assay performed and on the clinical setting. Most laboratories worldwide use standard indirect immunofluorescence tests (IFT) to screen for ANCA and then confirm positive IFT results with antigen-specific tests for proteinase 3 (PR3) and myeloperoxidase (MPO). Developments such as automated image analysis of immunofluorescence patterns, so-called third-generation PR3-ANCA and MPO-ANCA ELISA, and multiplex technology have improved the detection of ANCAs. However, challenges in routine clinical practice remain, including methodological aspects of IFT performance, the diverse antigen-specific assays available, the diagnostic value of testing in clinical settings and the prognostic value of serial ANCA monitoring in the prediction of disease relapse. This Review summarizes the available data on ANCA testing, discusses the usefulness of the various ANCA assays and advises on the clinical indications for the use of ANCA testing.
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Affiliation(s)
- Elena Csernok
- Department of Rheumatology, Klinikum Bad Bramstedt &University Hospital of Schleswig-Holstein, Oskar-Alexanderstrasse 26, 24576 Bad Bramstedt, Germany
| | - Frank Moosig
- Department of Rheumatology, Klinikum Bad Bramstedt &University Hospital of Schleswig-Holstein, Oskar-Alexanderstrasse 26, 24576 Bad Bramstedt, Germany
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