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Nerenz RD, Hooshmand SI, Jackowiak E, Shirilla D, Yang Y, Yang K, Obeidat AZ. Clinical decision support improves autoimmune/paraneoplastic antibody panel utilization. Am J Clin Pathol 2024:aqae101. [PMID: 39255415 DOI: 10.1093/ajcp/aqae101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2024] [Accepted: 07/09/2024] [Indexed: 09/12/2024] Open
Abstract
OBJECTIVES Selection of autoimmune/paraneoplastic antibody panels remains challenging because health-care professionals often lack familiarity with panel contents, recommended specimen types, and antibody combinations for a given patient. Inappropriate use adds cost, prompts unnecessary additional workup, and delays the identification of the true cause of patient symptoms. In this study, we assessed whether order-entry clinical decision support can improve autoimmune/paraneoplastic antibody panel utilization. METHODS An order-entry clinical decision support tool was embedded in the electronic health record system. Using a nested panel structure, the decision support tool prompted clinicians to identify their patient's clinical presentation and guided selection of the appropriate tests. In addition, the tool featured a duplicate checking function to alert clinicians when placing multiple orders with substantially similar antibody content within a 3-month period. Panel ordering practices were assessed during the 12 months before implementation and compared with the 6 months immediately following implementation. RESULTS Clinical decision support significantly reduced the monthly test volume of all orderables from 75.8 per month before implementation to 54.5 per month after implementation (incident rate ratio [IRR], 0.72; 95% CI, 0.63-0.81; P < .001). Placement of multiple orders for panels with substantially overlapping antibody content also decreased significantly, from 7.0 per month to 1.2 per month (IRR, 0.17; 95% CI, 0.07-0.33; P < .001). The number of neural-specific antibodies detected remained unchanged, but the reduction in total test volume increased the neural-specific antibody positivity rate from 4.2% to 6.8% (IRR, 1.61; 95% CI, 0.94-2.70; P = .075). CONCLUSIONS Order-entry clinical decision support offers an efficient and effective approach to improve the utilization of autoimmune/paraneoplastic antibody panels.
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Affiliation(s)
- Robert D Nerenz
- Department of Pathology and Laboratory Medicine, Division of Biostatistics, Medical College of Wisconsin, Milwaukee, WI, US
| | - Sam I Hooshmand
- Department of Neurology, Division of Biostatistics, Medical College of Wisconsin, Milwaukee, WI, US
| | - Eric Jackowiak
- Department of Neurology, Division of Biostatistics, Medical College of Wisconsin, Milwaukee, WI, US
| | - David Shirilla
- Department of Neurology, Division of Biostatistics, Medical College of Wisconsin, Milwaukee, WI, US
| | - Yushan Yang
- Data Science Institute, Division of Biostatistics, Medical College of Wisconsin, Milwaukee, WI, US
| | - Kai Yang
- Data Science Institute, Division of Biostatistics, Medical College of Wisconsin, Milwaukee, WI, US
| | - Ahmed Z Obeidat
- Department of Neurology, Division of Biostatistics, Medical College of Wisconsin, Milwaukee, WI, US
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2
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Sundell GN, Tao SC. Phage immunoprecipitation and sequencing-a versatile technique for mapping the antibody reactome. Mol Cell Proteomics 2024:100831. [PMID: 39168282 DOI: 10.1016/j.mcpro.2024.100831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 08/13/2024] [Accepted: 08/16/2024] [Indexed: 08/23/2024] Open
Abstract
Characterizing the antibody reactome for circulating antibodies provide insight into pathogen exposure, allergies and autoimmune diseases. This is important for biomarker discovery, clinical diagnosis, and prognosis of disease progression, as well as population-level insights into the immune system. The emerging technology phage display immunoprecipitation and sequencing (PhIP-seq) is a high-throughput method for identifying antigens/epitopes of the antibody reactome. In PhIP-seq, libraries with sequences of defined lengths and overlapping segments are bioinformatically designed using naturally occurring proteins and cloned into phage genomes to be displayed on the surface. These libraries are used in immunoprecipitation experiments of circulating antibodies. This can be done with parallel samples from multiple sources, and the DNA inserts from the bound phages are barcoded and subjected to next-generation sequencing for hit-determination. PhIP-seq is a powerful technique for characterizing the antibody reactome that has undergone rapid advances in recent years. In this review, we comprehensively describe the history of PhIP-seq and discuss recent advances in library design and applications.
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Affiliation(s)
- Gustav N Sundell
- Shanghai Center for Systems Biomedicine, Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, China
| | - Sheng-Ce Tao
- Shanghai Center for Systems Biomedicine, Key Laboratory of Systems Biomedicine (Ministry of Education), Shanghai Jiao Tong University, Shanghai 200240, China.
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McKeon A, Pittock SJ. Overview and Diagnostic Approach in Autoimmune Neurology. Continuum (Minneap Minn) 2024; 30:960-994. [PMID: 39088285 DOI: 10.1212/con.0000000000001447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2024]
Abstract
OBJECTIVE The field of autoimmune neurology is rapidly evolving. This article reviews the epidemiology and pathophysiology as well as current approaches to clinical and paraclinical assessment, testing paradigms, and general principles of treatment. LATEST DEVELOPMENTS Improved recognition of autoimmune diagnoses among patients who have phenotypically diverse, subacute onset neurologic presentations is facilitated by disease-specific antibody biomarker discovery. These antibodies have varying associations with paraneoplastic causation (from no association to greater than 70% positive predictive value), immunotherapy responses, and outcomes. To simplify assessment in an increasingly complex discipline, neurologic phenotype-specific serum and CSF antibody evaluations are recommended. Clinical trials have led to the approval of monoclonal therapies for neuromyelitis optica spectrum disorder (NMOSD) and are underway for N-methyl-d-aspartate (NMDA) receptor and leucine-rich glioma inactivated protein 1 (LGI1) encephalitides. ESSENTIAL POINTS Autoimmune neurology is now a mainstream subspecialty, consisting of disorders with diverse presentations detectable using antibody testing of serum and CSF. Early and sustained immunotherapy (eg, corticosteroids, intravenous immunoglobulin [IVIg], plasma exchange) is recommended and may be supplemented by immune suppressants (eg, rituximab or cyclophosphamide) to sustain responses and optimize outcomes.
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Mathias A, Perriot S, Jones S, Canales M, Bernard-Valnet R, Gimenez M, Torcida N, Oberholster L, Hottinger AF, Zekeridou A, Theaudin M, Pot C, Du Pasquier R. Human stem cell-derived neurons and astrocytes to detect novel auto-reactive IgG response in immune-mediated neurological diseases. Front Immunol 2024; 15:1419712. [PMID: 39114659 PMCID: PMC11303155 DOI: 10.3389/fimmu.2024.1419712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Accepted: 07/11/2024] [Indexed: 08/10/2024] Open
Abstract
Background and objectives Up to 46% of patients with presumed autoimmune limbic encephalitis are seronegative for all currently known central nervous system (CNS) antigens. We developed a cell-based assay (CBA) to screen for novel neural antibodies in serum and cerebrospinal fluid (CSF) using neurons and astrocytes derived from human-induced pluripotent stem cells (hiPSCs). Methods Human iPSC-derived astrocytes or neurons were incubated with serum/CSF from 99 patients [42 with inflammatory neurological diseases (IND) and 57 with non-IND (NIND)]. The IND group included 11 patients with previously established neural antibodies, six with seronegative neuromyelitis optica spectrum disorder (NMOSD), 12 with suspected autoimmune encephalitis/paraneoplastic syndrome (AIE/PNS), and 13 with other IND (OIND). IgG binding to fixed CNS cells was detected using fluorescently-labeled antibodies and analyzed through automated fluorescence measures. IgG neuronal/astrocyte reactivity was further analyzed by flow cytometry. Peripheral blood mononuclear cells (PBMCs) were used as CNS-irrelevant control target cells. Reactivity profile was defined as positive using a Robust regression and Outlier removal test with a false discovery rate at 10% following each individual readout. Results Using our CBA, we detected antibodies recognizing hiPSC-derived neural cells in 19/99 subjects. Antibodies bound specifically to astrocytes in nine cases, to neurons in eight cases, and to both cell types in two cases, as confirmed by microscopy single-cell analyses. Highlighting the significance of our comprehensive 96-well CBA assay, neural-specific antibody binding was more frequent in IND (15 of 42) than in NIND patients (4 of 57) (Fisher's exact test, p = 0.0005). Two of four AQP4+ NMO and four of seven definite AIE/PNS with intracellular-reactive antibodies [1 GFAP astrocytopathy, 2 Hu+, 1 Ri+ AIE/PNS)], as identified in diagnostic laboratories, were also positive with our CBA. Most interestingly, we showed antibody-reactivity in two of six seronegative NMOSD, six of 12 probable AIE/PNS, and one of 13 OIND. Flow cytometry using hiPSC-derived CNS cells or PBMC-detected antibody binding in 13 versus zero patients, respectively, establishing the specificity of the detected antibodies for neural tissue. Conclusion Our unique hiPSC-based CBA allows for the testing of novel neuron-/astrocyte-reactive antibodies in patients with suspected immune-mediated neurological syndromes, and negative testing in established routine laboratories, opening new perspectives in establishing a diagnosis of such complex diseases.
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Affiliation(s)
- Amandine Mathias
- Laboratories of Neuroimmunology, Neuroscience Research Center and Division of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and Lausanne University, Epalinges, Switzerland
| | - Sylvain Perriot
- Laboratories of Neuroimmunology, Neuroscience Research Center and Division of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and Lausanne University, Epalinges, Switzerland
| | - Samuel Jones
- Laboratories of Neuroimmunology, Neuroscience Research Center and Division of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and Lausanne University, Epalinges, Switzerland
| | - Mathieu Canales
- Laboratories of Neuroimmunology, Neuroscience Research Center and Division of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and Lausanne University, Epalinges, Switzerland
| | - Raphaël Bernard-Valnet
- Service of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Marie Gimenez
- Laboratories of Neuroimmunology, Neuroscience Research Center and Division of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and Lausanne University, Epalinges, Switzerland
| | - Nathan Torcida
- Laboratories of Neuroimmunology, Neuroscience Research Center and Division of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and Lausanne University, Epalinges, Switzerland
| | - Larise Oberholster
- Laboratories of Neuroimmunology, Neuroscience Research Center and Division of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and Lausanne University, Epalinges, Switzerland
| | - Andreas F. Hottinger
- Lundin Family Brain Tumor Research Centre, Department of Clinical Neurosciences and Oncology, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Anastasia Zekeridou
- Department of Laboratory Medicine and Pathology and Department of Neurology, Center for MS and Autoimmune Neurology, Mayo Clinic, Rochester, MN, United States
| | - Marie Theaudin
- Service of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Caroline Pot
- Laboratories of Neuroimmunology, Neuroscience Research Center and Division of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and Lausanne University, Epalinges, Switzerland
- Service of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
| | - Renaud Du Pasquier
- Laboratories of Neuroimmunology, Neuroscience Research Center and Division of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and Lausanne University, Epalinges, Switzerland
- Service of Neurology, Department of Clinical Neurosciences, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland
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5
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Santoro JD, Demakakos P, He S, Kumar S, Murton M, Tennigkeit F, Hemingway C. A systematic review of the epidemiology of pediatric autoimmune encephalitis: disease burden and clinical decision-making. Front Neurol 2024; 15:1408606. [PMID: 39040538 PMCID: PMC11262030 DOI: 10.3389/fneur.2024.1408606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Accepted: 06/19/2024] [Indexed: 07/24/2024] Open
Abstract
Background Autoimmune encephalitis (AIE) comprises a group of rare, immune system-mediated conditions. Clinical manifestations among children are not well-characterized, and there are challenges in testing and diagnosis. This can result in treatment delays, which has been found to correlate with poorer long-term outcomes. This challenge is exacerbated by the scarcity of epidemiological reporting of AIE. The objective of this systematic literature review (SLR) was to identify studies reporting epidemiological data on AIE in children. Methods MEDLINE, Embase, the Cochrane Library, and the University of York Centre for Reviews and Dissemination (CRD) were searched in May 2023 for studies reporting on the epidemiology of AIE in children. These were supplemented with additional searches of conference proceedings, gray literature, and the reference lists of identified SLRs. Quality of studies was assessed using a modified version of the Joanna Briggs Institute (JBI) Checklist for Prevalence Studies. Results Forty-three publications reporting on 41 unique studies were included. Nine studies reported incidence estimates of different subtypes of AIE, with only one reporting the incidence of overall AIE in children ≤ 18 years, estimated at 1.54 per million children per year in the Netherlands. Three studies reported the incidence of pediatric N-methyl-D-aspartate receptor (NMDAR)-AIE [in United Kingdom (UK), Hong Kong, and Denmark]. The other studies reported incidence data for selected populations. Conclusion This SLR highlights a paucity of epidemiology data for AIE in children, which is likely reflective of difficulties in testing and diagnosis. There is a clear need for further research and awareness of these challenges in clinical practice to avoid treatment delays and improve patient outcomes. A deeper understanding of the epidemiology of AIE will help determine the worldwide burden of disease and inform research, health policies and clinical decision-making.
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Affiliation(s)
- Jonathan D. Santoro
- Department of Neurology, Keck School of Medicine of the University of Southern California, Los Angeles, CA, United States
| | | | - Shiying He
- Costello Medical Singapore Ltd., Singapore, Singapore
| | - Swati Kumar
- Costello Medical Consulting Ltd., Cambridge, United Kingdom
| | - Molly Murton
- Costello Medical Consulting Ltd., Cambridge, United Kingdom
| | | | - Cheryl Hemingway
- Department of Neurology, Great Ormond Street Hospital for Children, London, United Kingdom
- UCL Queen Square Institute of Neurology, London, United Kingdom
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6
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Dutra LA, Silva PVDC, Ferreira JHF, Marques AC, Toso FF, Vasconcelos CCF, Brum DG, Pereira SLDA, Adoni T, Rocha LJDA, Sampaio LPDB, Sousa NADC, Paolilo RB, Pizzol AD, Costa BKD, Disserol CCD, Pupe C, Valle DAD, Diniz DS, Abrantes FFD, Schmidt FDR, Cendes F, Oliveira FTMD, Martins GJ, Silva GD, Lin K, Pinto LF, Santos MLSF, Gonçalves MVM, Krueger MB, Haziot MEJ, Barsottini OGP, Nascimento OJMD, Nóbrega PR, Proveti PM, Castilhos RMD, Daccach V, Glehn FV. Brazilian consensus recommendations on the diagnosis and treatment of autoimmune encephalitis in the adult and pediatric populations. ARQUIVOS DE NEURO-PSIQUIATRIA 2024; 82:1-15. [PMID: 39089672 DOI: 10.1055/s-0044-1788586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
BACKGROUND Autoimmune encephalitis (AIE) is a group of inflammatory diseases characterized by the presence of antibodies against neuronal and glial antigens, leading to subacute psychiatric symptoms, memory complaints, and movement disorders. The patients are predominantly young, and delays in treatment are associated with worse prognosis. OBJECTIVE With the support of the Brazilian Academy of Neurology (Academia Brasileira de Neurologia, ABN) and the Brazilian Society of Child Neurology (Sociedade Brasileira de Neurologia Infantil, SBNI), a consensus on the diagnosis and treatment of AIE in Brazil was developed using the Delphi method. METHODS A total of 25 panelists, including adult and child neurologists, participated in the study. RESULTS The panelists agreed that patients fulfilling criteria for possible AIE should be screened for antineuronal antibodies in the serum and cerebrospinal fluid (CSF) using the tissue-based assay (TBA) and cell-based assay (CBA) techniques. Children should also be screened for anti-myelin oligodendrocyte glucoprotein antibodies (anti-MOG). Treatment should be started within the first 4 weeks of symptoms. The first-line option is methylprednisolone plus intravenous immunoglobulin (IVIG) or plasmapheresis, the second-line includes rituximab and/or cyclophosphamide, while third-line treatment options are bortezomib and tocilizumab. Most seizures in AIE are symptomatic, and antiseizure medications may be weaned after the acute stage. In anti-N-methyl-D-aspartate receptor (anti-NMDAR) encephalitis, the panelists have agreed that oral immunosuppressant agents should not be used. Patients should be evaluated at the acute and postacute stages using functional and cognitive scales, such as the Mini-Mental State Examination (MMSE), the Montreal Cognitive Assessment (MoCA), the Modified Rankin Scale (mRS), and the Clinical Assessment Scale in Autoimmune Encephalitis (CASE). CONCLUSION The present study provides tangible evidence for the effective management of AIE patients within the Brazilian healthcare system.
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Affiliation(s)
- Lívia Almeida Dutra
- Hospital Israelita Albert Einstein, Instituto do Cérebro, São Paulo, São Paulo SP, Brazil
| | | | | | | | - Fabio Fieni Toso
- Hospital Israelita Albert Einstein, Instituto do Cérebro, São Paulo, São Paulo SP, Brazil
| | | | - Doralina Guimarães Brum
- Universidade Estadual Paulista, Faculdade de Medicina de Botucatu, Departamento de Neurologia, Psicologia e Psiquiatria, Botucatu SP, Brazil
| | - Samira Luisa Dos Apóstolos Pereira
- Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Departamento de Neurologia e Neurocirurgia, São Paulo SP, Brazil
| | - Tarso Adoni
- Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Departamento de Neurologia e Neurocirurgia, São Paulo SP, Brazil
| | | | | | | | - Renata Barbosa Paolilo
- Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Instituto da Criança, São Paulo SP, Brazil
| | - Angélica Dal Pizzol
- Hospital Moinhos de Vento, Departamento de Neurologia, Porto Alegre RS, Brazil
| | - Bruna Klein da Costa
- Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre RS, Brazil
- Santa Casa de Misericórdia de Porto Alegre, Porto Alegre RS, Brazil
| | - Caio César Diniz Disserol
- Universidade Federal do Paraná, Hospital das Clínicas, Curitiba PR, Brazil
- Instituto de Neurologia de Curitiba, Curitiba PR, Brazil
| | - Camila Pupe
- Universidade Federal Fluminense, Niterói RJ, Brazil
| | | | | | | | | | | | | | | | - Guilherme Diogo Silva
- Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Departamento de Neurologia e Neurocirurgia, São Paulo SP, Brazil
| | - Katia Lin
- Universidade Federal de Santa Catarina, Florianópolis SC, Brazil
| | - Lécio Figueira Pinto
- Universidade de São Paulo, Faculdade de Medicina, Hospital das Clínicas, Departamento de Neurologia e Neurocirurgia, São Paulo SP, Brazil
| | | | | | | | | | | | | | | | | | | | - Vanessa Daccach
- Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Ribeirão Preto SP, Brazil
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7
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Mangioris G, Halfdanarson TR, Lennon VA, Chang BK, Dubey D, Dyck PJB, Flanagan EP, McKeon A, Mills JR, Pittock SJ, Zekeridou A. Neurological autoimmunity in patients with non-pulmonary neuroendocrine neoplasms: clinical manifestations and neural autoantibody profiles. Eur J Neurol 2024; 31:e16273. [PMID: 38466015 PMCID: PMC11235830 DOI: 10.1111/ene.16273] [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: 01/20/2024] [Revised: 02/16/2024] [Accepted: 02/21/2024] [Indexed: 03/12/2024]
Abstract
BACKGROUND AND PURPOSE Paraneoplastic neurological autoimmunity is well described with small-cell lung cancer, but information is limited for other neuroendocrine neoplasms (NENs). METHODS Adult patients with histopathologically confirmed non-pulmonary NENs, neurological autoimmunity within 5 years of NEN diagnosis, and neural antibody testing performed at the Mayo Clinic Neuroimmunology Laboratory (January 2008 to March 2023) were retrospectively identified. Control sera were available from patients with NENs without neurological autoimmunity (116). RESULTS Thirty-four patients were identified (median age 68 years, range 31-87). The most common primary tumor sites were pancreas (nine), skin (Merkel cell, eight), small bowel/duodenum (seven), and unknown (seven). Five patients received immune checkpoint inhibitor (ICI) therapy before symptom onset; symptoms preceded cancer diagnosis in 62.1% of non-ICI-treated patients. The most frequent neurological phenotypes (non-ICI-treated) were movement disorders (12; cerebellar ataxia in 10), dysautonomia (six), peripheral neuropathy (eight), encephalitis (four), and neuromuscular junction disorders (four). Neural antibodies were detected in 55.9% of patients studied (most common specificities: P/Q-type voltage-gated calcium channel [seven], muscle-type acetylcholine receptor [three], anti-neuronal nuclear antibody type 1 [three], and neuronal intermediate filaments [two]), but in only 6.9% of controls. Amongst patients receiving cancer or immunosuppressive therapy, 51.6% had partial or complete recovery. Outcomes were unfavorable in 48.3% (non-ICI-treated) and neural autoantibody positivity was associated with poor neurological outcome. DISCUSSION Neurological autoimmunity associated with non-pulmonary NENs is often multifocal and can be treatment responsive, underscoring the importance of rapid recognition and early treatment.
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Affiliation(s)
- Georgios Mangioris
- Department of Laboratory Medicine and PathologyMayo ClinicRochesterMinnesotaUSA
| | | | - Vanda A. Lennon
- Department of Laboratory Medicine and PathologyMayo ClinicRochesterMinnesotaUSA
- Department of NeurologyMayo ClinicRochesterMinnesotaUSA
- Department of ImmunologyMayo ClinicRochesterMinnesotaUSA
| | | | - Divyanshu Dubey
- Department of Laboratory Medicine and PathologyMayo ClinicRochesterMinnesotaUSA
- Department of NeurologyMayo ClinicRochesterMinnesotaUSA
- Center for Multiple Sclerosis and Autoimmune NeurologyMayo ClinicRochesterMinnesotaUSA
| | | | - Eoin P. Flanagan
- Department of Laboratory Medicine and PathologyMayo ClinicRochesterMinnesotaUSA
- Department of NeurologyMayo ClinicRochesterMinnesotaUSA
- Center for Multiple Sclerosis and Autoimmune NeurologyMayo ClinicRochesterMinnesotaUSA
| | - Andrew McKeon
- Department of Laboratory Medicine and PathologyMayo ClinicRochesterMinnesotaUSA
- Department of NeurologyMayo ClinicRochesterMinnesotaUSA
- Center for Multiple Sclerosis and Autoimmune NeurologyMayo ClinicRochesterMinnesotaUSA
| | - John R. Mills
- Department of Laboratory Medicine and PathologyMayo ClinicRochesterMinnesotaUSA
| | - Sean J. Pittock
- Department of Laboratory Medicine and PathologyMayo ClinicRochesterMinnesotaUSA
- Department of NeurologyMayo ClinicRochesterMinnesotaUSA
- Center for Multiple Sclerosis and Autoimmune NeurologyMayo ClinicRochesterMinnesotaUSA
| | - Anastasia Zekeridou
- Department of Laboratory Medicine and PathologyMayo ClinicRochesterMinnesotaUSA
- Department of NeurologyMayo ClinicRochesterMinnesotaUSA
- Center for Multiple Sclerosis and Autoimmune NeurologyMayo ClinicRochesterMinnesotaUSA
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8
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Gilligan M, McGuigan C, McKeon A. Autoimmune central nervous system disorders: Antibody testing and its clinical utility. Clin Biochem 2024; 126:110746. [PMID: 38462203 PMCID: PMC11016295 DOI: 10.1016/j.clinbiochem.2024.110746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 02/16/2024] [Accepted: 03/05/2024] [Indexed: 03/12/2024]
Abstract
A rapidly expanding repertoire of neural antibody biomarkers exists for autoimmune central nervous system (CNS) disorders. Following clinical recognition of an autoimmune CNS disorder, the detection of a neural antibody facilitates diagnosis and informs prognosis and management. This review considers the phenotypes, diagnostic assay methodologies, and clinical utility of neural antibodies in autoimmune CNS disorders. Autoimmune CNS disorders may present with a diverse range of clinical features. Clinical phenotype should inform the neural antibodies selected for testing via the use of phenotype-specific panels. Both serum and cerebrospinal fluid (CSF) are preferred in the vast majority of cases but for some analytes either CSF (e.g. N-methyl-D-aspartate receptor [NMDA-R] IgG) or serum (e.g. aquaporin-4 [AQP4] IgG) specimens may be preferred. Screening using 2 methods is recommended for most analytes, particularly paraneoplastic antibodies. We utilize murine tissue-based indirect immunofluorescence assay (TIFA) with subsequent confirmatory protein-specific testing. The cellular location of the target antigen informs choice of confirmatory diagnostic assay (e.g. blot for intracellular antigens such as Hu; cell-based assay for cell surface targets such as leucine-rich glioma inactivated 1 [LGI1]). Titers of positive results have limited diagnostic utility with the exception of glutamic acid decarboxylase (GAD) 65 IgG autoimmunity, which is associated with neurological disease at higher values. While novel antibodies are typically discovered using established techniques such as TIFA and immunoprecipitation-mass spectrometry, more recent high-throughput molecular technologies (such as protein microarray and phage-display immunoprecipitation sequencing) may expedite the process of antibody discovery. Individual neural antibodies inform the clinician regarding the clinical associations, oncological risk stratification and tumor histology, the likely prognosis, and immunotherapy choice. In the era of neural antibody biomarkers for autoimmune CNS disorders, access to appropriate laboratory assays for neural antibodies is of critical importance in the diagnosis and management of these disorders.
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Affiliation(s)
- Michael Gilligan
- Departments of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Department of Neurology, St Vincent's University Hospital, Dublin, Ireland
| | | | - Andrew McKeon
- Departments of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA; Department of Neurology, Mayo Clinic, Rochester, MN, USA.
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9
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Hahn C, Budhram A, Alikhani K, AlOhaly N, Beecher G, Blevins G, Brooks J, Carruthers R, Comtois J, Cowan J, de Robles P, Hébert J, Kapadia RK, Lapointe S, Mackie A, Mason W, McLane B, Muccilli A, Poliakov I, Smyth P, Williams KG, Uy C, McCombe JA. Canadian Consensus Guidelines for the Diagnosis and Treatment of Autoimmune Encephalitis in Adults. Can J Neurol Sci 2024:1-21. [PMID: 38312020 DOI: 10.1017/cjn.2024.16] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2024]
Abstract
Autoimmune encephalitis is increasingly recognized as a neurologic cause of acute mental status changes with similar prevalence to infectious encephalitis. Despite rising awareness, approaches to diagnosis remain inconsistent and evidence for optimal treatment is limited. The following Canadian guidelines represent a consensus and evidence (where available) based approach to both the diagnosis and treatment of adult patients with autoimmune encephalitis. The guidelines were developed using a modified RAND process and included input from specialists in autoimmune neurology, neuropsychiatry and infectious diseases. These guidelines are targeted at front line clinicians and were created to provide a pragmatic and practical approach to managing such patients in the acute setting.
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Affiliation(s)
- Christopher Hahn
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Adrian Budhram
- Clinical Neurological Sciences, London Health Sciences Centre, London, ON, Canada
- Department of Pathology and Laboratory Medicine, Western University, London Health Sciences Centre, London, ON, Canada
| | - Katayoun Alikhani
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Nasser AlOhaly
- Division of Neurology, University of Toronto, Toronto, ON, Canada
| | - Grayson Beecher
- Division of Neurology, University of Alberta, Edmonton, AB, Canada
| | - Gregg Blevins
- Division of Neurology, University of Alberta, Edmonton, AB, Canada
| | - John Brooks
- Division of Neurology, University of Toronto, Toronto, ON, Canada
| | - Robert Carruthers
- Division of Neurology, University of British Columbia, Vancouver, BC, Canada
| | - Jacynthe Comtois
- Neurosciences, Universite de Montreal Faculte de Medecine, Montreal, QC, Canada
| | - Juthaporn Cowan
- Division of Infectious Diseases, Department of Medicine Ottawa Hospital, Ottawa, ON, Canada
| | - Paula de Robles
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
- Department of Oncology, University of Calgary, Calgary, AB, Canada
| | - Julien Hébert
- Division of Neurology, University of Toronto, Toronto, ON, Canada
| | - Ronak K Kapadia
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
| | - Sarah Lapointe
- Neurosciences, Universite de Montreal Faculte de Medecine, Montreal, QC, Canada
| | - Aaron Mackie
- Department of Psychiatry, University of Calgary, Calgary, AB, Canada
| | - Warren Mason
- Division of Neurology, University of Toronto, Toronto, ON, Canada
| | - Brienne McLane
- Department of Clinical Neurosciences, University of Calgary, Calgary, AB, Canada
- Department of Psychiatry, University of Calgary, Calgary, AB, Canada
| | | | - Ilia Poliakov
- Division of Neurology, University of Saskatchewan College of Medicine, Saskatoon, SK, Canada
| | - Penelope Smyth
- Division of Neurology, University of Alberta, Edmonton, AB, Canada
| | | | - Christopher Uy
- Division of Neurology, University of British Columbia, Vancouver, BC, Canada
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Budhram A, Flanagan EP. Optimizing the diagnostic performance of neural antibody testing for paraneoplastic and autoimmune encephalitis in clinical practice. HANDBOOK OF CLINICAL NEUROLOGY 2024; 200:365-382. [PMID: 38494290 DOI: 10.1016/b978-0-12-823912-4.00002-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
The detection of neural antibodies in patients with paraneoplastic and autoimmune encephalitis has majorly advanced the diagnosis and management of neural antibody-associated diseases. Although testing for these antibodies has historically been restricted to specialized centers, assay commercialization has made this testing available to clinical chemistry laboratories worldwide. This improved test accessibility has led to reduced turnaround time and expedited diagnosis, which are beneficial to patient care. However, as the utilization of these assays has increased, so too has the need to evaluate how they perform in the clinical setting. In this chapter, we discuss assays for neural antibody detection that are in routine use, draw attention to their limitations and provide strategies to help clinicians and laboratorians overcome them, all with the aim of optimizing neural antibody testing for paraneoplastic and autoimmune encephalitis in clinical practice.
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Affiliation(s)
- Adrian Budhram
- Department of Clinical Neurological Sciences, Western University, London Health Sciences Centre, London, ON, Canada; Department of Pathology and Laboratory Medicine, Western University, London Health Sciences Centre, London, ON, Canada.
| | - Eoin P Flanagan
- Department of Neurology, Mayo Clinic, Rochester, MN, United States; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, United States
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11
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Budhram A, Sechi E. Antibodies to neural cell surface and synaptic proteins in paraneoplastic neurologic syndromes. HANDBOOK OF CLINICAL NEUROLOGY 2024; 200:347-364. [PMID: 38494289 DOI: 10.1016/b978-0-12-823912-4.00006-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Among patients with paraneoplastic neurologic syndromes (PNS), emphasis has historically been placed on neural antibodies against intracellular proteins that have a strong association with malignancy. Because of the intracellular location of their antigenic targets, these antibodies are typically considered to be non-pathogenic surrogate markers of immune cell-mediated neural injury. Unfortunately, patients with these antibodies often have suboptimal response to immunotherapy and poor prognosis. Over the last two decades, however, dramatic advancements have been made in the discovery and clinical characterization of neural antibodies against extracellular targets. These antibodies are generally considered to be pathogenic, given their potential to directly alter antigen structure or function, and patients with these antibodies often respond favorably to prompt immunotherapy. These antibodies also associate with tumors and may thus occur as PNS, albeit more variably than neural antibodies against intracellular targets. The updated 2021 PNS diagnostic criteria, which classifies antibodies as high-risk, intermediate-risk, or lower-risk for an associated cancer, better clarifies how neural antibodies against extracellular targets relate to PNS. Using this recently created framework, the clinical presentations, ancillary test findings, oncologic associations, and treatment responses of syndromes associated with these antibodies are discussed.
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Affiliation(s)
- Adrian Budhram
- Department of Clinical Neurological Sciences, Western University, London Health Sciences Centre, London, ON, Canada; Department of Pathology and Laboratory Medicine, Western University, London Health Sciences Centre, London, ON, Canada.
| | - Elia Sechi
- Department of Medical, Surgical and Experimental Sciences, University of Sassari, Sassari, Italy
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12
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Masciocchi S, Businaro P, Scaranzin S, Morandi C, Franciotta D, Gastaldi M. General features, pathogenesis, and laboratory diagnostics of autoimmune encephalitis. Crit Rev Clin Lab Sci 2024; 61:45-69. [PMID: 37777038 DOI: 10.1080/10408363.2023.2247482] [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: 03/23/2023] [Accepted: 08/09/2023] [Indexed: 10/02/2023]
Abstract
Autoimmune encephalitis (AE) is a group of inflammatory conditions that can associate with the presence of antibodies directed to neuronal intracellular, or cell surface antigens. These disorders are increasingly recognized as an important differential diagnosis of infectious encephalitis and of other common neuropsychiatric conditions. Autoantibody diagnostics plays a pivotal role for accurate diagnosis of AE, which is of utmost importance for the prompt recognition and early treatment. Several AE subgroups can be identified, either according to the prominent clinical phenotype, presence of a concomitant tumor, or type of neuronal autoantibody, and recent diagnostic criteria have provided important insights into AE classification. Antibodies to neuronal intracellular antigens typically associate with paraneoplastic neurological syndromes and poor prognosis, whereas antibodies to synaptic/neuronal cell surface antigens characterize many AE subtypes that associate with tumors less frequently, and that are often immunotherapy-responsive. In addition to the general features of AE, we review current knowledge on the pathogenic mechanisms underlying these disorders, focusing mainly on the potential role of neuronal antibodies in the most frequent conditions, and highlight current theories and controversies. Then, we dissect the crucial aspects of the laboratory diagnostics of neuronal antibodies, which represents an actual challenge for both pathologists and neurologists. Indeed, this diagnostics entails technical difficulties, along with particularly interesting novel features and pitfalls. The novelties especially apply to the wide range of assays used, including specific tissue-based and cell-based assays. These assays can be developed in-house, usually in specialized laboratories, or are commercially available. They are widely used in clinical immunology and in clinical chemistry laboratories, with relevant differences in analytic performance. Indeed, several data indicate that in-house assays could perform better than commercial kits, notwithstanding that the former are based on non-standardized protocols. Moreover, they need expertise and laboratory facilities usually unavailable in clinical chemistry laboratories. Together with the data of the literature, we critically evaluate the analytical performance of the in-house vs commercial kit-based approach. Finally, we propose an algorithm aimed at integrating the present strategies of the laboratory diagnostics in AE for the best clinical management of patients with these disorders.
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Affiliation(s)
- Stefano Masciocchi
- Neuroimmunology Research Section, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, Università degli Studi di Pavia, Pavia, Italy
| | - Pietro Businaro
- Neuroimmunology Research Section, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, Università degli Studi di Pavia, Pavia, Italy
| | - Silvia Scaranzin
- Neuroimmunology Research Section, IRCCS Mondino Foundation, Pavia, Italy
| | - Chiara Morandi
- Neuroimmunology Research Section, IRCCS Mondino Foundation, Pavia, Italy
| | - Diego Franciotta
- Neuroimmunology Research Section, IRCCS Mondino Foundation, Pavia, Italy
| | - Matteo Gastaldi
- Neuroimmunology Research Section, IRCCS Mondino Foundation, Pavia, Italy
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13
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Akkus S, Elkhooly M, Amatya S, Shrestha K, Sharma K, Kagzi Y, Khan E, Gupta R, Piquet AL, Jaiswal S, Wen S, Tapia M, Samant R, Sista SR, Sriwastava S. Autoimmune and paraneoplastic neurological disorders: A review of relevant neuroimaging findings. J Neurol Sci 2023; 454:120830. [PMID: 37856996 DOI: 10.1016/j.jns.2023.120830] [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: 08/21/2023] [Revised: 09/28/2023] [Accepted: 10/04/2023] [Indexed: 10/21/2023]
Abstract
INTRODUCTION Paraneoplastic neurologic syndromes (PNS) and autoimmune encephalitis (AIE) are immune-mediated disorders. PNS is linked to cancer, while AIE may not Their clinical manifestations and imaging patterns need further elucidation. OBJECTIVE/AIMS To investigate the clinical profiles, antibody associations, neuroimaging patterns, treatments, and outcomes of PNS and AIE. METHODS A systematic review of 379 articles published between 2014 and 2023 was conducted. Of the 55 studies screened, 333 patients were diagnosed with either PNS or AIE and tested positive for novel antibodies. Data on demographics, symptoms, imaging, antibodies, cancer associations, treatment, and outcomes were extracted. RESULTS The study included 333 patients (mean age 54 years, 67% males) with PNS and AIE positive for various novel antibodies. 84% had central nervous system issues like cognitive impairment (53%), rhombencephalitis (17%), and cerebellar disorders (24%). Neuroimaging revealed distinct patterns with high-risk antibodies associated with brainstem lesions in 98%, cerebellar in 91%, hippocampal in 98%, basal ganglia in 75%, and spinal cord in 91%, while low/intermediate-risk antibodies were associated with medial temporal lobe lesions in 71% and other cortical/subcortical lesions in 55%. High-risk antibodies were associated with younger males, deep brain lesions, and increased mortality of 61%, while low/intermediate-risk antibodies were associated with females, cortical/subcortical lesions, and better outcomes with 39% mortality. Associated cancers included seminomas (23%), lung (19%), ovarian (2%), and breast (2%). Treatments included IVIG, chemotherapy, and plasmapheresis. Overall mortality was 25% in this cohort. CONCLUSION PNS and AIE have distinct clinical and radiological patterns based on antibody profiles. High-risk antibodies are associated with increased mortality while low/intermediate-risk antibodies are associated with improved outcomes. Appropriate imaging and antibody testing are critical for accurate diagnosis.
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Affiliation(s)
- Sema Akkus
- Department of Neurology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Mahmoud Elkhooly
- Department of Neurology, Wayne state University, Detroit, MI, USA; Department of Neurology, Southern Illinois university, Springfield, IL, USA; Department of Neuropsychiatry, Minia University, Egypt
| | - Suban Amatya
- Department of Medicine, Patan Academy of Health Sciences, Kathmandu, Nepal
| | - Kriti Shrestha
- Department of Medicine, Patan Academy of Health Sciences, Kathmandu, Nepal
| | - Kanika Sharma
- Division of Multiple Sclerosis and Neuroimmunology Department of Neurology, McGovern Medical School (UT Health), University of Texas Health Science Center at Houston, Houston, TX,USA
| | - Yusuf Kagzi
- Mahatma Gandhi Memorial Medical College, Indore, India
| | - Erum Khan
- Department of Neurology, University of Alabama at Birmingham, Al, USA
| | - Rajesh Gupta
- Division of Multiple Sclerosis and Neuroimmunology Department of Neurology, McGovern Medical School (UT Health), University of Texas Health Science Center at Houston, Houston, TX,USA
| | - Amanda L Piquet
- Neuroimmunology, Neuroinfectious Disease and Neurohospitalist Sections, University of Colorado School of Medicine, CO, USA
| | - Shruti Jaiswal
- Department of Neuro-oncology, MD Anderson Cancer Center, Houston, TX, USA
| | - Sijin Wen
- West Virginia Clinical Transitional Science, Morgantown, WV, USA
| | - Michaela Tapia
- West Virginia Clinical Transitional Science, Morgantown, WV, USA
| | - Rohan Samant
- Department of Neuroradiology, McGovern Medical School (UT Health), University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Sri Raghav Sista
- Division of Multiple Sclerosis and Neuroimmunology Department of Neurology, McGovern Medical School (UT Health), University of Texas Health Science Center at Houston, Houston, TX,USA
| | - Shitiz Sriwastava
- Division of Multiple Sclerosis and Neuroimmunology Department of Neurology, McGovern Medical School (UT Health), University of Texas Health Science Center at Houston, Houston, TX,USA.
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14
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McKeon A, Lesnick C, Vorasoot N, Buckley MW, Dasari S, Flanagan EP, Gilligan M, Lafrance-Corey R, Miske R, Pittock SJ, Scharf M, Yang B, Zekeridou A, Dubey D, Mills J. Utility of Protein Microarrays for Detection of Classified and Novel Antibodies in Autoimmune Neurologic Disease. NEUROLOGY(R) NEUROIMMUNOLOGY & NEUROINFLAMMATION 2023; 10:e200145. [PMID: 37550073 PMCID: PMC10406426 DOI: 10.1212/nxi.0000000000200145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 06/01/2023] [Indexed: 08/09/2023]
Abstract
BACKGROUND AND OBJECTIVES Neural antibodies are detected by tissue-based indirect immunofluorescence assay (IFA) in Mayo Clinic's Neuroimmunology Laboratory practice, but the process of characterizing and validating novel antibodies is lengthy. We report our assessment of human protein arrays. METHODS Assessment of arrays (81% human proteome coverage) was undertaken using diverse known positive samples (17 serum and 14 CSF). Samples from patients with novel neural antibodies were reflexed from IFA to arrays. Confirmatory assays were cell-based (CBA) or line blot. Epitope mapping was undertaken using phage display immunoprecipitation sequencing (PhiPSeq). RESULTS Control positive samples known to be reactive with linear epitopes of intracellular antigens (e.g., ANNA-1 [anti-Hu]) were readily identified by arrays in 20 of 21 samples. By contrast, 10 positive controls known to be enriched with antibodies against cell surface protein conformational epitopes (e.g., GluN1 subunit of NMDA-R) were indistinguishable from background signal. Three antibodies, previously characterized by other investigators (but unclassified in our laboratory), were unmasked in 4 patients using arrays (July-December 2022): Neurexin-3α, 1 patient; regulator of gene protein signaling (RGS)8, 1 patient; and seizure-related homolog like 2 (SEZ6L2), 2 patients. All were accompanied by previously reported phenotypes (encephalitis, 1; cerebellar ataxia, 3). Patient 1 had subacute onset of seizures and encephalopathy. Neurexin-3α ranked high in CSF (second ranked neural protein) but low in serum (660th overall). Neurexin-3α CBA was positive in both samples. Patient 2 presented with rapidly progressive cerebellar ataxia. RGS8 ranked the highest neural protein in available CSF sample by array (third overall). RGS8-specific line blot was positive. Patients 3 and 4 had rapidly progressive cerebellar ataxia. SEZ6L2 was the highest ranked neural antigen by arrays in all samples (CSF, 1, serum, 2; Patient 3, ranked 9th overall in CSF, 11th in serum; Patient 4, 6th overall in serum]). By PhIPSeq, diverse neurexin-3α epitopes (including cell surface) were detected in CSF from patient 1, but no SEZ6L2 peptides were detected for serum or CSF samples from Patient 3. DISCUSSION Individualized autoimmune neurologic diagnoses may be accelerated using protein arrays. They are optimal for detection of intracellular antigen-reactive antibodies, though certain cell surface-directed antibodies (neurexin-3α and SEZ6L2) may also be detected.
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Affiliation(s)
- Andrew McKeon
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany.
| | - Connie Lesnick
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Nisa Vorasoot
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Monica W Buckley
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Surendra Dasari
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Eoin P Flanagan
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Michael Gilligan
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Reghann Lafrance-Corey
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Ramona Miske
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Sean J Pittock
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Madeleine Scharf
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Binxia Yang
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Anastasia Zekeridou
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - Divyanshu Dubey
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
| | - John Mills
- From the Departments of Laboratory Medicine and Pathology and Neurology (A.M., E.P.F., S.J.P., B.Y., A.Z., D.D.); Department of Laboratory Medicine and Pathology (C.L., N.V., M.G., R.L.-C., J.M.); Khon Kaen University (N.V.), Thailand; University of Virginia (M.W.B.); Division of Biomedical Statistics and Informatics (S.D.), Mayo Clinic, Rochester, MN; The Institute for Experimental Immunology (R.M., M.S.), affiliated to Euroimmun AG, Lubeck, Germany
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Budhram A, Freeman E, Bhayana V, Yang L. Positive Predictive Value of Anti-GAD65 ELISA Cut-Offs for Neurological Autoimmunity. Can J Neurol Sci 2023; 50:766-768. [PMID: 35861111 DOI: 10.1017/cjn.2022.276] [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] [Indexed: 11/05/2022]
Abstract
High anti-GAD65 levels associate with core manifestations of GAD65 neurological autoimmunity. ELISA cut-offs for high anti-GAD65 levels (>10,000 IU/ml in serum, >100 IU/ml in CSF) have been proposed that merit further evaluation. We reviewed patients who underwent anti-GAD65 ELISA for suspected autoimmune encephalitis and found values above these cut-offs to have a positive predictive value (PPV) for neurological autoimmunity of 88%. Anti-GAD65 values above proposed ELISA cut-offs have a reasonably high PPV for neurological autoimmunity in patients with suspected autoimmune encephalitis. Consideration of alternative diagnoses and corroboration with CSF can help flag potentially clinically irrelevant results and avoid patient misdiagnosis.
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Affiliation(s)
- Adrian Budhram
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, Ontario, Canada
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Erin Freeman
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Vipin Bhayana
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Liju Yang
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada
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16
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He J, Lian Y. Clinical study of autonomic dysfunction in patients with autoimmune encephalitis. Immunobiology 2023; 228:152711. [PMID: 37543010 DOI: 10.1016/j.imbio.2023.152711] [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: 04/20/2023] [Revised: 06/25/2023] [Accepted: 07/15/2023] [Indexed: 08/07/2023]
Abstract
BACKGROUND Autoimmune encephalitis (AE) is a collective name, covering an emerging spectrum of autoimmune-mediated neurological diseases related to antibodies and synaptic or intracellular proteins. Anti-NMDAR, anti-LGI1, and anti-GABABR are three types of neuronal cell surface antibodies. Autonomic dysfunction represents a frequently occurring clinical manifestation. This observational study purposes to investigate comparisons between two groups with or without autonomic dysfunction and detect the autonomic dysfunction and other indexes in anti-NMDAR, anti-LGI1, and anti-GABABR cohorts. METHODS Patients with anti-NMDAR, anti-LGI1 and anti-GABABR encephalitis were recruited from the May 2017 to the April 2022. The following information was recorded: age, age at onset, tumor presence, gender, prodromal symptoms, clinical manifestations, cranial magnetic resonance imaging, cerebrospinal fluid and blood examinations, and immunotherapy. RESULTS There were totally 161 patients enrolled in this study. Among these participants, 104 individuals (64.6%) presented autonomic dysfunction and the remaining 57 (35.4%) were free of autonomic dysfunction. Sinus tachycardia was the most common autonomic dysfunction, followed by pollakiuria/uroclepsia, feverscence, central hypoventilation, sinus bradycardia, constipation, uroschesis, hyperhidrosis, hypersalivation, hypotension, and early satiety/emesis. Compared to patients without autonomic dysfunction, those with autonomic dysfunction had a higher incidence of central hypoventilation and ICU admissions. Meanwhile, in both groups with or without autonomic dysfunction, meatal behavior disorder, cognitive impairment, and epileptic seizure were three most common clinical manifestations. There were no significant differences in cranial magnetic resonance imaging (MRI), cerebrospinal fluid (CSF) examination, antibody titers and number of immunotherapy types. Further analysis of AE mediated by distinct neuronal surface antibodies demonstrated that there were 85 anti-NMDAR, 56 anti-LGI1, and 20 anti-GABABR encephalitis patients. The significant differences between these three cohorts appeared in age, tumor presence, fervescence presence and antibody titers. CONCLUSION This study demonstrated the comparisons between autonomic dysfunction group and autonomic dysfunction-free group and provided insights into better diagnosis and treatment.
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Affiliation(s)
- Jiao He
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450000, China
| | - Yajun Lian
- Department of Neurology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450000, China.
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17
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Balint B. Relevance of Antibody Testing in Movement Disorders. Mov Disord Clin Pract 2023; 10:S32-S35. [PMID: 37637987 PMCID: PMC10448132 DOI: 10.1002/mdc3.13772] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 05/03/2023] [Accepted: 05/04/2023] [Indexed: 08/29/2023] Open
Affiliation(s)
- Bettina Balint
- Department of NeurologyUniversity Hospital Zurich, University of ZurichZurichSwitzerland
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18
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Sawaya R, Ricard G, McKeon A, Budhram A. Paraneoplastic Neuronal Intermediate Filament Autoimmunity with Hepatocellular Carcinoma. Can J Neurol Sci 2023:1-2. [PMID: 37496428 PMCID: PMC10818005 DOI: 10.1017/cjn.2023.264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Affiliation(s)
- Robin Sawaya
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, ON, Canada
| | | | - Andrew McKeon
- Department of Neurology, Mayo Clinic, Rochester, MN, USA
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Adrian Budhram
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, ON, Canada
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, ON, Canada
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Orozco E, Valencia-Sanchez C, Britton J, Dubey D, Flanagan EP, Lopez-Chiriboga AS, Zalewski N, Zekeridou A, Pittock SJ, McKeon A. Autoimmune Encephalitis Criteria in Clinical Practice. Neurol Clin Pract 2023; 13:e200151. [PMID: 37124463 PMCID: PMC10132262 DOI: 10.1212/cpj.0000000000200151] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 02/13/2023] [Indexed: 05/02/2023]
Abstract
Background and Objectives To assess the clinical practice applicability of autoimmune encephalitis (AE) criteria (2016). Methods Medical records of 538 adults diagnosed with AE or related autoimmune encephalopathy at Mayo Clinic (not including pure movement disorders) were reviewed and AE guideline criteria applied. Results Of 538 patients, 288 were male (52%). The median symptom onset age was 55 years (range, 11-97 years; 16 had onset as children). All had other non-AE diagnoses reasonably excluded. Of 538 patients, 361 (67%) met at least possible criteria, having all 3 of subacute onset; memory deficits, altered mental status or psychiatric symptoms, and ≥1 supportive feature (new focal objective CNS finding, N = 285; new-onset seizures, N = 283; supportive MRI findings, N = 251; or CSF pleocytosis, N = 160). Of 361 patients, AE subgroups were as follows: definite AE (N = 221, 61%, [87% AE-specific IgG positive]), probable seronegative AE (N = 18, 5%), Hashimoto encephalopathy (N = 20, 6%), or possible AE not otherwise categorizable (N = 102, 28%). The 221 patients with definite AE had limbic encephalitis (N = 127, 57%), anti-NMDA-R encephalitis (N = 32, 15%), ADEM (N = 8, 4%), or other AE-specific IgG defined (N = 54, 24%). The 3 most common definite AE-IgGs detected were as follows: LGI1 (76, 34%), NMDA-R (32, 16%), and high-titer GAD65 (23, 12%). The remaining 177 patients (33%) not meeting possible AE criteria had the following: seizures only (65, 12% of all 538 patients), brainstem encephalitis without supratentorial findings (55, 10%; none had Bickerstaff encephalitis), or other (57, 11%). Those 57 "others" lacked sufficient supportive clinical, radiologic, or CSF findings (N = 26), had insidious or initially episodic onset of otherwise typical disorders (N = 21), or had atypical syndromes without clearcut memory deficits, altered mental status, or psychiatric symptoms (N = 10). Fifteen of 57 were AE-specific IgG positive (26%). Among the remaining 42, evidence of other organ-specific autoimmunity (mostly thyroid) was encountered in 31 (74%, ≥1 coexisting autoimmune disease [21, 50%] or ≥1 non-AE-specific antibodies detected [23, 53%]), and all but 1 had an objective immunotherapy response (97%). Discussion The 2016 AE guidelines permit autoimmune causation assessment in subacute encephalopathy and are highly specific. Inclusion could be improved by incorporating AE-IgG-positive patients with isolated seizures or brainstem disorders. Some patients with atypical presentations but with findings supportive of autoimmunity may be immune therapy responsive.
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Affiliation(s)
- Emma Orozco
- Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL
| | - Cristina Valencia-Sanchez
- Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL
| | - Jeffrey Britton
- Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL
| | - Divyanshu Dubey
- Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL
| | - Eoin P Flanagan
- Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL
| | - A Sebastian Lopez-Chiriboga
- Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL
| | - Nicholas Zalewski
- Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL
| | - Anastasia Zekeridou
- Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL
| | - Sean J Pittock
- Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL
| | - Andrew McKeon
- Department of Laboratory Medicine and Pathology (EO, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; Department of Neurology (CV-S, NZ), Mayo Clinic, AZ; Department of Neurology (JB, DD, EPF, AZ, SJP, AM), Mayo Clinic, Rochester, MN; and Department of Neurology (ASL-C), Mayo Clinic, FL
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20
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Alkabie S, Yang L, Budhram A. Neural antibody testing for autoimmune encephalitis: Impact of Autoimmune Neurology approval process on test utilization. J Neurol Sci 2023; 450:120676. [PMID: 37209510 DOI: 10.1016/j.jns.2023.120676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/01/2023] [Accepted: 05/08/2023] [Indexed: 05/22/2023]
Affiliation(s)
- Samir Alkabie
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Liju Yang
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Adrian Budhram
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, Ontario, Canada; Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada.
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21
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Marsili L, Marcucci S, LaPorta J, Chirra M, Espay AJ, Colosimo C. Paraneoplastic Neurological Syndromes of the Central Nervous System: Pathophysiology, Diagnosis, and Treatment. Biomedicines 2023; 11:biomedicines11051406. [PMID: 37239077 DOI: 10.3390/biomedicines11051406] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 05/04/2023] [Accepted: 05/06/2023] [Indexed: 05/28/2023] Open
Abstract
Paraneoplastic neurological syndromes (PNS) include any symptomatic and non-metastatic neurological manifestations associated with a neoplasm. PNS associated with antibodies against intracellular antigens, known as "high-risk" antibodies, show frequent association with underlying cancer. PNS associated with antibodies against neural surface antigens, known as "intermediate- or low-risk" antibodies, are less frequently associated with cancer. In this narrative review, we will focus on PNS of the central nervous system (CNS). Clinicians should have a high index of suspicion with acute/subacute encephalopathies to achieve a prompt diagnosis and treatment. PNS of the CNS exhibit a range of overlapping "high-risk" clinical syndromes, including but not limited to latent and overt rapidly progressive cerebellar syndrome, opsoclonus-myoclonus-ataxia syndrome, paraneoplastic (and limbic) encephalitis/encephalomyelitis, and stiff-person spectrum disorders. Some of these phenotypes may also arise from recent anti-cancer treatments, namely immune-checkpoint inhibitors and CAR T-cell therapies, as a consequence of boosting of the immune system against cancer cells. Here, we highlight the clinical features of PNS of the CNS, their associated tumors and antibodies, and the diagnostic and therapeutic strategies. The potential and the advance of this review consists on a broad description on how the field of PNS of the CNS is constantly expanding with newly discovered antibodies and syndromes. Standardized diagnostic criteria and disease biomarkers are fundamental to quickly recognize PNS to allow prompt treatment initiation, thus improving the long-term outcome of these conditions.
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Affiliation(s)
- Luca Marsili
- Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology, University of Cincinnati, Cincinnati, OH 45219, USA
| | - Samuel Marcucci
- Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology, University of Cincinnati, Cincinnati, OH 45219, USA
| | - Joseph LaPorta
- Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology, University of Cincinnati, Cincinnati, OH 45219, USA
| | - Martina Chirra
- Department of Internal Medicine, University of Cincinnati, Cincinnati, OH 45219, USA
| | - Alberto J Espay
- Gardner Family Center for Parkinson's Disease and Movement Disorders, Department of Neurology, University of Cincinnati, Cincinnati, OH 45219, USA
| | - Carlo Colosimo
- Department of Neurology, Santa Maria University Hospital, 05100 Terni, Italy
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22
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Dinoto A, Zara P, Mariotto S, Ferrari S, Flanagan EP, Budhram A, Orellana D, Turilli D, Solla P, Day GS, Sechi E, Lopez-Chiriboga AS. Autoimmune encephalitis misdiagnosis and mimics. J Neuroimmunol 2023; 378:578071. [PMID: 36989703 DOI: 10.1016/j.jneuroim.2023.578071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 03/03/2023] [Accepted: 03/13/2023] [Indexed: 03/18/2023]
Abstract
The diagnosis of autoimmune encephalitis (AE) requires reasonable exclusion of other conditions. The aim of this study is to characterize mimickers and misdiagnoses of AE, thus we performed an independent PubMed search for mimickers of AEs or patients with alternative neurological disorders misdiagnosed as AE. Fifty-eight studies with 66 patients were included. Neoplastic (n = 17), infectious (n = 15), genetic (n = 13), neurodegenerative (n = 8), and other neurological (n = 8) or systemic autoimmune (n = 5) disorders were misdiagnosed as AE. The lack of fulfillment of diagnostic criteria for AE, atypical neuroimaging findings, non-inflammatory CSF findings, non-specific autoantibody specificities and partial response to immunotherapy were major confounding factors.
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Affiliation(s)
- Alessandro Dinoto
- Neurology Unit, Department of Neuroscience, Biomedicine and Movement Sciences, University of Verona, Policlinico GB Rossi, Verona, Italy
| | - Pietro Zara
- Department of Medical, Surgical and Experimental Sciences, University of Sassari, Sassari, Italy
| | - Sara Mariotto
- Neurology Unit, Department of Neuroscience, Biomedicine and Movement Sciences, University of Verona, Policlinico GB Rossi, Verona, Italy
| | - Sergio Ferrari
- Neurology Unit, Department of Neuroscience, Biomedicine and Movement Sciences, University of Verona, Policlinico GB Rossi, Verona, Italy
| | - Eoin P Flanagan
- Department of Neurology, Mayo Clinic, Rochester, MN, USA; Department of Laboratory Medicine and Pathology, Neuroimmunology Laboratory, Mayo Clinic, Rochester, MN, USA
| | - Adrian Budhram
- Department of Clinical Neurological Sciences, Western University, London Health Sciences Centre, London, Ontario, Canada; Department of Pathology and Laboratory Medicine, Western University, London Health Sciences Centre, London, Ontario, Canada
| | - Daniela Orellana
- Department of Neurology, Mayo Clinic College of Medicine, Jacksonville, FL, USA
| | - Davide Turilli
- Department of Medical, Surgical and Experimental Sciences, University of Sassari, Sassari, Italy
| | - Paolo Solla
- Department of Medical, Surgical and Experimental Sciences, University of Sassari, Sassari, Italy
| | - Gregory S Day
- Department of Neurology, Mayo Clinic College of Medicine, Jacksonville, FL, USA
| | - Elia Sechi
- Department of Medical, Surgical and Experimental Sciences, University of Sassari, Sassari, Italy
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23
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Flanagan EP, Geschwind MD, Lopez-Chiriboga AS, Blackburn KM, Turaga S, Binks S, Zitser J, Gelfand JM, Day GS, Dunham SR, Rodenbeck SJ, Clardy SL, Solomon AJ, Pittock SJ, McKeon A, Dubey D, Zekeridou A, Toledano M, Turner LE, Vernino S, Irani SR. Autoimmune Encephalitis Misdiagnosis in Adults. JAMA Neurol 2023; 80:30-39. [PMID: 36441519 PMCID: PMC9706400 DOI: 10.1001/jamaneurol.2022.4251] [Citation(s) in RCA: 73] [Impact Index Per Article: 73.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 09/22/2022] [Indexed: 11/29/2022]
Abstract
Importance Autoimmune encephalitis misdiagnosis can lead to harm. Objective To determine the diseases misdiagnosed as autoimmune encephalitis and potential reasons for misdiagnosis. Design, Setting, and Participants This retrospective multicenter study took place from January 1, 2014, to December 31, 2020, at autoimmune encephalitis subspecialty outpatient clinics including Mayo Clinic (n = 44), University of Oxford (n = 18), University of Texas Southwestern (n = 18), University of California, San Francisco (n = 17), University of Washington in St Louis (n = 6), and University of Utah (n = 4). Inclusion criteria were adults (age ≥18 years) with a prior autoimmune encephalitis diagnosis at a participating center or other medical facility and a subsequent alternative diagnosis at a participating center. A total of 393 patients were referred with an autoimmune encephalitis diagnosis, and of those, 286 patients with true autoimmune encephalitis were excluded. Main Outcomes and Measures Data were collected on clinical features, investigations, fulfillment of autoimmune encephalitis criteria, alternative diagnoses, potential contributors to misdiagnosis, and immunotherapy adverse reactions. Results A total of 107 patients were misdiagnosed with autoimmune encephalitis, and 77 (72%) did not fulfill diagnostic criteria for autoimmune encephalitis. The median (IQR) age was 48 (35.5-60.5) years and 65 (61%) were female. Correct diagnoses included functional neurologic disorder (27 [25%]), neurodegenerative disease (22 [20.5%]), primary psychiatric disease (19 [18%]), cognitive deficits from comorbidities (11 [10%]), cerebral neoplasm (10 [9.5%]), and other (18 [17%]). Onset was acute/subacute in 56 (52%) or insidious (>3 months) in 51 (48%). Magnetic resonance imaging of the brain was suggestive of encephalitis in 19 of 104 patients (18%) and cerebrospinal fluid (CSF) pleocytosis occurred in 16 of 84 patients (19%). Thyroid peroxidase antibodies were elevated in 24 of 62 patients (39%). Positive neural autoantibodies were more frequent in serum than CSF (48 of 105 [46%] vs 7 of 91 [8%]) and included 1 or more of GAD65 (n = 14), voltage-gated potassium channel complex (LGI1 and CASPR2 negative) (n = 10), N-methyl-d-aspartate receptor by cell-based assay only (n = 10; 6 negative in CSF), and other (n = 18). Adverse reactions from immunotherapies occurred in 17 of 84 patients (20%). Potential contributors to misdiagnosis included overinterpretation of positive serum antibodies (53 [50%]), misinterpretation of functional/psychiatric, or nonspecific cognitive dysfunction as encephalopathy (41 [38%]). Conclusions and Relevance When evaluating for autoimmune encephalitis, a broad differential diagnosis should be considered and misdiagnosis occurs in many settings including at specialized centers. In this study, red flags suggesting alternative diagnoses included an insidious onset, positive nonspecific serum antibody, and failure to fulfill autoimmune encephalitis diagnostic criteria. Autoimmune encephalitis misdiagnosis leads to morbidity from unnecessary immunotherapies and delayed treatment of the correct diagnosis.
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Affiliation(s)
- Eoin P. Flanagan
- Laboratory Medicine and Pathology, Mayo Clinic College of Medicine, Rochester, Minnesota
- Center for Multiple Sclerosis and Autoimmune Neurology, Department of Neurology, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Michael D. Geschwind
- Department of Neurology, University of California, San Francisco (UCSF), San Francisco
| | | | - Kyle M. Blackburn
- Department of Neurology, University of Texas Southwestern Medical Center, Dallas
| | - Sanchit Turaga
- Autoimmune Neurology Group, West Wing, Level 3, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom
| | - Sophie Binks
- Autoimmune Neurology Group, West Wing, Level 3, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom
| | - Jennifer Zitser
- Department of Neurology, University of California, San Francisco (UCSF), San Francisco
- Movement Disorders Unit, Department of Neurology, Tel Aviv Sourazky Medical Center, Affiliate of Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Jeffrey M. Gelfand
- Department of Neurology, University of California, San Francisco (UCSF), San Francisco
| | - Gregory S. Day
- Department of Neurology, Mayo Clinic, Jacksonville, Florida
- Washington University in St Louis, St Louis, Missouri
| | | | | | | | | | - Sean J. Pittock
- Laboratory Medicine and Pathology, Mayo Clinic College of Medicine, Rochester, Minnesota
- Center for Multiple Sclerosis and Autoimmune Neurology, Department of Neurology, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Andrew McKeon
- Laboratory Medicine and Pathology, Mayo Clinic College of Medicine, Rochester, Minnesota
- Center for Multiple Sclerosis and Autoimmune Neurology, Department of Neurology, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Divyanshu Dubey
- Laboratory Medicine and Pathology, Mayo Clinic College of Medicine, Rochester, Minnesota
- Center for Multiple Sclerosis and Autoimmune Neurology, Department of Neurology, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Anastasia Zekeridou
- Laboratory Medicine and Pathology, Mayo Clinic College of Medicine, Rochester, Minnesota
- Center for Multiple Sclerosis and Autoimmune Neurology, Department of Neurology, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Michel Toledano
- Center for Multiple Sclerosis and Autoimmune Neurology, Department of Neurology, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Lindsey E. Turner
- Graduate School of Health Sciences, Mayo Clinic College of Medicine, Rochester, Minnesota
| | - Steven Vernino
- Department of Neurology, University of Texas Southwestern Medical Center, Dallas
| | - Sarosh R. Irani
- Autoimmune Neurology Group, West Wing, Level 3, John Radcliffe Hospital, University of Oxford, Oxford, United Kingdom
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24
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Fernández-Fournier M, Lacruz L, Nozal P, Chico JL, Tallón Barranco A, Otero-Ortega L, Corral I, Carrasco A. The study of neural antibodies in neurology: A practical summary. Front Immunol 2022; 13:1043723. [PMID: 36569884 PMCID: PMC9768545 DOI: 10.3389/fimmu.2022.1043723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 11/21/2022] [Indexed: 12/12/2022] Open
Abstract
The field of Autoimmune Neurology is expanding rapidly, with new neural antibodies being identified each year. However, these disorders remain rare. Deciding when to test for these antibodies, when and what samples are to be obtained, how to handle and study them correctly, and how to interpret test results, is complex. In this article we review current diagnostic techniques and provide a comprehensive explanation on the study of these patients, in an effort to help with correct diagnosis minimizing false positive and false negative results. We also propose routine storage of samples and referral of certain cases to specialized research laboratories.
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Affiliation(s)
- Mireya Fernández-Fournier
- Neuroimmunology and MS Unit, Department of Neurology, La Paz University Hospital, Neurology and Cerebrovascular Disease Group, Neuroscience Area of Hospital La Paz Institute for Health Research – IdiPAZ, Universidad Autónoma de Madrid,Madrid, Spain
| | - Laura Lacruz
- Neuroimmunology and MS Unit, Department of Neurology, La Paz University Hospital, Neurology and Cerebrovascular Disease Group, Neuroscience Area of Hospital La Paz Institute for Health Research – IdiPAZ, Universidad Autónoma de Madrid,Madrid, Spain
| | - Pilar Nozal
- Department of Immunology, La Paz University Hospital, Complement Research Group, of Hospital La Paz Institute for Health Research – IdiPAZ, Center for Biomedical Network Research on Rare Diseases (Ciberer), Madrid, Spain
| | - Juan Luis Chico
- Department of Neurology, Ramon y Cajal University Hospital, Instituto Ramón y Cajal de Investigación Sanitaria IRYCIS, Madrid, Spain
| | - Antonio Tallón Barranco
- Neuroimmunology and MS Unit, Department of Neurology, La Paz University Hospital, Neurology and Cerebrovascular Disease Group, Neuroscience Area of Hospital La Paz Institute for Health Research – IdiPAZ, Universidad Autónoma de Madrid,Madrid, Spain
| | - Laura Otero-Ortega
- Neurology and Cerebrovascular Disease Group, Neuroscience Area of Hospital La Paz Institute for Health Research – IdiPAZ (La Paz University Hospital- Universidad Autónoma de Madrid), Madrid, Spain
| | - Iñigo Corral
- Department of Neurology, Ramon y Cajal University Hospital, Instituto Ramón y Cajal de Investigación Sanitaria IRYCIS, Madrid, Spain
| | - Angela Carrasco
- Department of Immunology, Ramon y Cajal University Hospital, Instituto Ramón y Cajal de Investigación Sanitaria IRYCIS, Madrid, Spain
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25
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Montalvo M, Khattak JF, Redenbaugh V, Britton J, Sanchez CV, Datta A, Tillema JM, Chen J, McKeon A, Pittock SJ, Flanagan EP, Dubey D. Acute symptomatic seizures secondary to myelin oligodendrocyte glycoprotein antibody-associated disease. Epilepsia 2022; 63:3180-3191. [PMID: 36168809 PMCID: PMC10641900 DOI: 10.1111/epi.17424] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 09/25/2022] [Accepted: 09/26/2022] [Indexed: 01/11/2023]
Abstract
OBJECTIVE To report the clinical presentations and outcomes of patients with seizure and myelin oligodendrocyte glycoprotein antibody-associated disease (MOGAD). METHODS We retrospectively reviewed the electronic medical records for clinical and paraclinical features among patients with seizures and MOG-IgG (immunoglobulin G) seropositivity. RESULTS We identified 213 patients with MOG-IgG seropositivity who fulfilled criteria for MOGAD. Seizures attributed to central nervous system (CNS) autoimmunity were observed in 10% of patients (n = 23: 19 children, 4 adults). The majority (n = 19, 83%) had pediatric disease onset. Focal motor seizures were the most common seizure semiology (16/23; 70%). Focal to bilateral tonic-clonic seizures were present in 12 patients (53%), and 3 patients (13%) developed status epilepticus. All patients had features of encephalitis at onset of seizures. Cerebral cortical encephalitis (CCE) was the most common radiological finding (10 unilateral and 5 bilateral cases). Eight of 23 patients (35%) had only CCE, six of 23 patients (26%) had only acute disseminated encephalomyelitis (ADEM), and seven of 23 patients (30%) had features of both. Fifteen patients (65%) had leptomeningeal enhancement. Three patients (13%) had coexistence of N-methyl-d-aspartate receptor (NMDAR) IgG. Only 3 of 23 patients (13%) developed drug- resistant epilepsy. Although the majority had MOGAD relapses (14/23, 60%) had only 5 of 23 patients had recurrence of episodes of encephalitis with associated seizures. Twenty-one of 23 patients (91%) had seizure freedom at last follow-up. SIGNIFICANCE MOG-IgG evaluation should be considered in patients who present with encephalitis and focal motor and/or focal to bilateral tonic-clonic seizures, especially pediatric patients with magnetic resonance imaging (MRI) brain findings consistent with CCE, ADEM, or other MOGAD presentations. The majority of these seizures are self-limited and do not require maintenance/chronic antiseizure medications. Although seizure recurrence is uncommon, many patients have MOGAD relapses in the form of encephalitis and optic neuritis.
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Affiliation(s)
| | | | | | | | | | | | | | - John Chen
- Department of Neurology, Mayo Clinic, Rochester MN
- Department of Ophthalmology, Mayo Clinic, Rochester MN
| | - Andrew McKeon
- Department of Neurology, Mayo Clinic, Rochester MN
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester MN
| | - Sean J. Pittock
- Department of Neurology, Mayo Clinic, Rochester MN
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester MN
| | - Eoin P Flanagan
- Department of Neurology, Mayo Clinic, Rochester MN
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester MN
| | - Divyanshu Dubey
- Department of Neurology, Mayo Clinic, Rochester MN
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester MN
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26
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Rettenmaier L, Abdel-Wahed L, McKeon A, Groth CL. Paraneoplastic neuronal intermediate filament presenting as encephalopathy and myoclonus: a case report and literature review. J Neurol 2022; 269:6145-6147. [PMID: 35604468 PMCID: PMC9561123 DOI: 10.1007/s00415-022-11191-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 05/11/2022] [Accepted: 05/12/2022] [Indexed: 11/29/2022]
Affiliation(s)
- Leigh Rettenmaier
- Department of Neurology, Massachusetts General Hospital, Boston, MA, USA.
| | - Lama Abdel-Wahed
- Department of Neurology, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA
| | - Andrew McKeon
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Christopher L Groth
- Department of Neurology, University of Iowa Hospitals and Clinics, Iowa City, Iowa, USA
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27
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Masi G, Li Y, Karatz T, Pham MC, Oxendine SR, Nowak RJ, Guptill JT, O'Connor KC. The clinical need for clustered AChR cell-based assay testing of seronegative MG. J Neuroimmunol 2022; 367:577850. [PMID: 35366559 PMCID: PMC9106915 DOI: 10.1016/j.jneuroim.2022.577850] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 03/23/2022] [Indexed: 12/31/2022]
Abstract
Trial eligibility in myasthenia gravis (MG) remains largely dependent on a positive autoantibody serostatus. This significantly hinders seronegative MG (SNMG) patients from receiving potentially beneficial new treatments. In a subset of SNMG patients, acetylcholine receptor (AChR) autoantibodies are detectable by a clustered AChR cell-based assay (CBA). Of 99 SNMG patients from two academic U.S. centers, 18 (18.2%) tested positive by this assay. Autoantibody positivity was further validated in 17/18 patients. In a complementary experiment, circulating AChR-specific B cells were identified in a CBA-positive SNMG patient. These findings corroborate the clinical need for clustered AChR CBA testing when evaluating SNMG patients.
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Affiliation(s)
- Gianvito Masi
- Department of Neurology, Yale School of Medicine, New Haven, CT 06511, USA; Department of Immunobiology, Yale School of Medicine, New Haven, CT 06511, USA
| | - Yingkai Li
- Neuromuscular Division, Department of Neurology, Duke University Medical Center, Durham, NC 27710, USA
| | - Tabitha Karatz
- Neuromuscular Division, Department of Neurology, Duke University Medical Center, Durham, NC 27710, USA
| | - Minh C Pham
- Department of Immunobiology, Yale School of Medicine, New Haven, CT 06511, USA
| | - Seneca R Oxendine
- Department of Neurology, Yale School of Medicine, New Haven, CT 06511, USA; Department of Immunobiology, Yale School of Medicine, New Haven, CT 06511, USA
| | - Richard J Nowak
- Department of Neurology, Yale School of Medicine, New Haven, CT 06511, USA
| | - Jeffrey T Guptill
- Neuromuscular Division, Department of Neurology, Duke University Medical Center, Durham, NC 27710, USA; Duke Clinical Research Institute, Durham, NC 27710, USA
| | - Kevin C O'Connor
- Department of Neurology, Yale School of Medicine, New Haven, CT 06511, USA; Department of Immunobiology, Yale School of Medicine, New Haven, CT 06511, USA.
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Schindler SE. Fluid Biomarkers in Dementia Diagnosis. Continuum (Minneap Minn) 2022; 28:822-833. [PMID: 35678404 DOI: 10.1212/con.0000000000001083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
PURPOSE OF REVIEW This article discusses how fluid biomarkers can augment the routine dementia evaluation and improve diagnostic accuracy. The tests that are currently available and the indications for their use are described. Further, tests that are under development and likely to be used in the future are identified. RECENT FINDINGS Technical improvements in assay sensitivity and precision have led to the rapid development of blood-based biomarkers for Alzheimer disease (AD) over the past several years. Studies have found that the ratio of amyloid-β (Aβ) peptides (Aβ42/Aβ40) and concentrations of phosphorylated tau isoforms in plasma can identify individuals with AD brain pathology. Blood-based tests may enable much broader use of AD biomarkers in the evaluation of patients with cognitive impairment. SUMMARY Even after a detailed history, examination, routine laboratory testing, and brain imaging, the cause of dementia sometimes remains unclear. CSF and blood-based biomarkers can evaluate for a range of neurologic disorders that are associated with dementia, including AD. Integrating data from fluid biomarker tests and the routine dementia evaluation may improve the accuracy of dementia diagnosis.
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Alkabie S, Budhram A. Testing for Antibodies Against Aquaporin-4 and Myelin Oligodendrocyte Glycoprotein in the Diagnosis of Patients With Suspected Autoimmune Myelopathy. Front Neurol 2022; 13:912050. [PMID: 35669883 PMCID: PMC9163833 DOI: 10.3389/fneur.2022.912050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2022] [Accepted: 04/26/2022] [Indexed: 11/13/2022] Open
Abstract
Autoimmune myelopathies are immune-mediated disorders of the spinal cord that can cause significant neurologic disability. Discoveries of antibodies targeting aquaporin-4 (AQP4-IgG) and myelin oligodendrocyte glycoprotein (MOG-IgG) have facilitated the diagnosis of autoimmune myelopathies that were previously considered to be atypical presentations of multiple sclerosis (MS) or idiopathic, and represent major advancements in the field of autoimmune neurology. The detection of these antibodies can substantially impact patient diagnosis and management, and increasing awareness of this has led to a dramatic increase in testing for these antibodies among patients with suspected autoimmune myelopathy. In this review we discuss test methodologies used to detect these antibodies, the role of serum vs. cerebrospinal fluid testing, and the value of antibody titers when interpreting results, with the aim of helping laboratorians and clinicians navigate this testing when ordered as part of the diagnostic evaluation for suspected autoimmune myelopathy.
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Affiliation(s)
- Samir Alkabie
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, ON, Canada
| | - Adrian Budhram
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, ON, Canada
- Deparment of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, ON, Canada
- *Correspondence: Adrian Budhram
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Chang YC, Nouri MN, Mirsattari S, Burneo JG, Budhram A. "Obvious" indications for Neural antibody testing in Epilepsy or Seizures: The ONES checklist. Epilepsia 2022; 63:1658-1670. [PMID: 35340020 PMCID: PMC9544067 DOI: 10.1111/epi.17238] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/24/2022] [Accepted: 03/24/2022] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Numerous predictive scores have been developed to help determine which patients with epilepsy or seizures of unknown etiology should undergo neural antibody testing. However, their diagnostic advantage compared to only performing testing in patients with "obvious" indications (e.g. broader features of autoimmune encephalitis, characteristic seizure semiologies) requires further study. We aimed to develop a checklist that identifies patients who have "obvious" indications for neural antibody testing, and compare its diagnostic performance to predictive scores. METHODS We developed the "Obvious" indications for Neural antibody testing in Epilepsy or Seizures (ONES) checklist through literature review. We then retrospectively reviewed patients who underwent neural antibody testing for epilepsy or seizures at our center between March 2019 and January 2021, to determine and compare the sensitivity and specificity of the ONES checklist to the recently-proposed Antibody Prevalence in Epilepsy and Encephalopathy (APE2)/Antibodies Contributing to Focal Epilepsy Signs and Symptoms (ACES) reflex score. RESULTS One-hundred-seventy patients who underwent neural antibody testing for epilepsy or seizures were identified. Seventy-four of 170 (43.5%) with a known etiology were excluded from sensitivity/specificity analyses; none had a true-positive neural antibody. Of the 96 patients with an unknown etiology, fourteen (15%) had a true-positive neural antibody. The proportion of false-positives was significantly higher among patients with a known etiology (3/3, 100%) compared to an unknown etiology (2/16, 13%) (P = .01). There was no significant difference of the APE2/ACES reflex score compared to the ONES checklist with regard to sensitivity (93% for both, P > .99) or specificity (71% versus 78%, P = .18) for true-positive neural antibodies. SIGNIFICANCE Compared to only performing neural antibody testing in patients with epilepsy or seizures of unknown etiology who have "obvious" indications, predictive scores confer no clear diagnostic advantage. Pre-specified definitions of what constitutes a true-positive neural antibody is required in future studies to avoid false-positives that can confound results.
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Affiliation(s)
- Yiu-Chia Chang
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Maryam N Nouri
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, Ontario, Canada.,Department of Paediatrics, London Health Sciences Centre, Western University, London, Ontario, Canada
| | - Seyed Mirsattari
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, Ontario, Canada.,Department of Medical Biophysics, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Jorge G Burneo
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, Ontario, Canada.,Neuroepidemiology Unit, Schulich School of Medicine & Dentistry, Western University, London, Ontario, Canada
| | - Adrian Budhram
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, Ontario, Canada.,Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, Ontario, Canada
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Zhang YX, Qiu W, Guan HZ, Wu LJ, Ding MP. Editorial: Antibody-Mediated Autoimmune Diseases of the CNS: Challenges and Approaches to Diagnosis and Management. Front Neurol 2022; 13:844155. [PMID: 35309572 PMCID: PMC8924292 DOI: 10.3389/fneur.2022.844155] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 02/04/2022] [Indexed: 12/02/2022] Open
Affiliation(s)
- Yin-Xi Zhang
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Wei Qiu
- Department of Neurology, Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
- *Correspondence: Wei Qiu
| | - Hong-Zhi Guan
- Department of Neurology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Hong-Zhi Guan
| | - Long-Jun Wu
- Department of Neurology, Mayo Clinic, Rochester, MN, United States
- Long-Jun Wu
| | - Mei-Ping Ding
- Department of Neurology, Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
- Mei-Ping Ding
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Shah S, Flanagan EP, Paul P, Smith CY, Bryant SC, Devine MF, Lennon VA, McKeon A, Pittock SJ, Dubey D. Population-Based Epidemiology Study of Paraneoplastic Neurologic Syndromes. NEUROLOGY(R) NEUROIMMUNOLOGY & NEUROINFLAMMATION 2022; 9:9/2/e1124. [PMID: 34937736 PMCID: PMC8696552 DOI: 10.1212/nxi.0000000000001124] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 11/15/2021] [Indexed: 01/22/2023]
Abstract
OBJECTIVES Population-based epidemiologic data for paraneoplastic neurologic syndromes (PNSs) in the United States are lacking. Our objective was to evaluate the incidence, prevalence, and associated morbidity of PNS. METHODS We performed a population-based epidemiology study in Olmsted County, Minnesota, with patients identified between January 1, 1987, and December 31, 2018, using the medical records linkage system of the Rochester Epidemiology Project (REP) who met the definite/probable 2021 PNS criteria and 2004 PNS criteria. Patients with dermatomyositis and myasthenia gravis with underlying tumors were included. Age- and sex-specific population counts were obtained from REP resources for January 1, 2014 (prevalence denominator) and annually for 1987-2018 (incidence denominator). Morbidity was estimated using disability-adjusted life years (DALYs; years lived with disability [YLD] plus years of life lost [YLL]). RESULTS There were 28 patients with PNS identified (50% female) residing in Olmsted County, Minnesota, with median age at diagnosis of 54.5 (IQR 46.5-69.0) years. All patients had a cancer diagnosis, and 18 (64%) patients were neural autoantibody positive including antineuronal nuclear autoantibody type 1 (ANNA-1/anti-Hu; n = 1), ANNA-2/anti-Ri (n = 1), muscle-type acetylcholine receptor (AChR; n = 6), Purkinje cell cytoplasmic antibody type 1 (PCA-1/anti-Yo; n = 1), kelch-like protein 11 (KLH11; n = 3), collapsin response mediator protein 5 (CRMP-5/anti-CV2; n = 2), α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid receptor (n = 1), neurofilament light chain (n = 1), leucine zipper 4 (LUZP4; n = 1), and unclassified neural antibodies (n = 1). PNS incidence was 0.6/100,000 person-years and increased over time from 0.4/100,000 person-years (1987-2002) to 0.8/100,000 person-years (2003-2018) (p = 0.06). Prevalence was 5.4/100,000 people. The median follow-up period after PNS diagnosis was 3.1 years (IQR, 1.1-9.9 years). Total disability-adjusted life years (DALYs) for 28 patients with PNS were 472.7 years, based on total years of life lost (YLL) for patients dying between 1987 and 2018 (n = 15) of 445.3 years plus years lived with disability (YLD) 27.4 years. DISCUSSION PNSs are rare neurologic disorders but are associated with severe morbidity and mortality. The estimated number of prevalent PNS cases in the United States is 17,099, and predicted DALY for all US PNS cases is 292,393 years. Their apparent increasing rate of detection is attributable to increasing physician awareness and availability of serologic testing.
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Affiliation(s)
- Shailee Shah
- From the Department of Neurology (S.S., E.P.F., P.P., M.F.D., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic; Department of Laboratory Medicine and Pathology (E.P.F., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic College of Medicine; Department of Quantitative Health Sciences (C.Y.S., S.C.B.), Mayo Clinic; Olmsted Medical Center (M.F.D.); and Department of Immunology (V.A.L.), Mayo Clinic, Rochester, MN
| | - Eoin P Flanagan
- From the Department of Neurology (S.S., E.P.F., P.P., M.F.D., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic; Department of Laboratory Medicine and Pathology (E.P.F., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic College of Medicine; Department of Quantitative Health Sciences (C.Y.S., S.C.B.), Mayo Clinic; Olmsted Medical Center (M.F.D.); and Department of Immunology (V.A.L.), Mayo Clinic, Rochester, MN
| | - Pritikanta Paul
- From the Department of Neurology (S.S., E.P.F., P.P., M.F.D., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic; Department of Laboratory Medicine and Pathology (E.P.F., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic College of Medicine; Department of Quantitative Health Sciences (C.Y.S., S.C.B.), Mayo Clinic; Olmsted Medical Center (M.F.D.); and Department of Immunology (V.A.L.), Mayo Clinic, Rochester, MN
| | - Carin Y Smith
- From the Department of Neurology (S.S., E.P.F., P.P., M.F.D., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic; Department of Laboratory Medicine and Pathology (E.P.F., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic College of Medicine; Department of Quantitative Health Sciences (C.Y.S., S.C.B.), Mayo Clinic; Olmsted Medical Center (M.F.D.); and Department of Immunology (V.A.L.), Mayo Clinic, Rochester, MN
| | - Sandra C Bryant
- From the Department of Neurology (S.S., E.P.F., P.P., M.F.D., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic; Department of Laboratory Medicine and Pathology (E.P.F., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic College of Medicine; Department of Quantitative Health Sciences (C.Y.S., S.C.B.), Mayo Clinic; Olmsted Medical Center (M.F.D.); and Department of Immunology (V.A.L.), Mayo Clinic, Rochester, MN
| | - Michelle F Devine
- From the Department of Neurology (S.S., E.P.F., P.P., M.F.D., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic; Department of Laboratory Medicine and Pathology (E.P.F., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic College of Medicine; Department of Quantitative Health Sciences (C.Y.S., S.C.B.), Mayo Clinic; Olmsted Medical Center (M.F.D.); and Department of Immunology (V.A.L.), Mayo Clinic, Rochester, MN
| | - Vanda A Lennon
- From the Department of Neurology (S.S., E.P.F., P.P., M.F.D., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic; Department of Laboratory Medicine and Pathology (E.P.F., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic College of Medicine; Department of Quantitative Health Sciences (C.Y.S., S.C.B.), Mayo Clinic; Olmsted Medical Center (M.F.D.); and Department of Immunology (V.A.L.), Mayo Clinic, Rochester, MN
| | - Andrew McKeon
- From the Department of Neurology (S.S., E.P.F., P.P., M.F.D., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic; Department of Laboratory Medicine and Pathology (E.P.F., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic College of Medicine; Department of Quantitative Health Sciences (C.Y.S., S.C.B.), Mayo Clinic; Olmsted Medical Center (M.F.D.); and Department of Immunology (V.A.L.), Mayo Clinic, Rochester, MN
| | - Sean J Pittock
- From the Department of Neurology (S.S., E.P.F., P.P., M.F.D., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic; Department of Laboratory Medicine and Pathology (E.P.F., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic College of Medicine; Department of Quantitative Health Sciences (C.Y.S., S.C.B.), Mayo Clinic; Olmsted Medical Center (M.F.D.); and Department of Immunology (V.A.L.), Mayo Clinic, Rochester, MN
| | - Divyanshu Dubey
- From the Department of Neurology (S.S., E.P.F., P.P., M.F.D., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic; Department of Laboratory Medicine and Pathology (E.P.F., V.A.L., A.M., S.J.P., D.D.), Mayo Clinic College of Medicine; Department of Quantitative Health Sciences (C.Y.S., S.C.B.), Mayo Clinic; Olmsted Medical Center (M.F.D.); and Department of Immunology (V.A.L.), Mayo Clinic, Rochester, MN.
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Budhram A, Yang L, Bhayana V, Mills JR, Dubey D. Clinical Sensitivity, Specificity, and Predictive Value of Neural Antibody Testing for Autoimmune Encephalitis. J Appl Lab Med 2022; 7:350-356. [PMID: 34996087 DOI: 10.1093/jalm/jfab127] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Accepted: 08/16/2021] [Indexed: 01/01/2023]
Affiliation(s)
- Adrian Budhram
- Department of Clinical Neurological Sciences, London Health Sciences Centre, Western University, London, ON, Canada.,Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, ON, Canada.,Department of Neurology, Mayo Clinic, Rochester, MN, USA
| | - Liju Yang
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, ON, Canada
| | - Vipin Bhayana
- Department of Pathology and Laboratory Medicine, London Health Sciences Centre, Western University, London, ON, Canada
| | - John R Mills
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Divyanshu Dubey
- Department of Neurology, Mayo Clinic, Rochester, MN, USA.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
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34
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Ancona C, Masenello V, Tinnirello M, Toscano LM, Leo A, La Piana C, Toldo I, Nosadini M, Sartori S. Autoimmune Encephalitis and Other Neurological Syndromes With Rare Neuronal Surface Antibodies in Children: A Systematic Literature Review. Front Pediatr 2022; 10:866074. [PMID: 35515348 PMCID: PMC9067304 DOI: 10.3389/fped.2022.866074] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Accepted: 03/16/2022] [Indexed: 11/13/2022] Open
Abstract
Neuronal surface antibody syndromes (NSAS) are an expanding group of autoimmune neurological diseases, whose most frequent clinical manifestation is autoimmune encephalitis (AE). Anti-NMDAR, anti-LGI1, and anti-CASPR2 autoimmunity represent the most described forms, while other NSAS are rarer and less well-characterized, especially in children. We carried out a systematic literature review of children with rare NSAS (with antibodies targeting D2R, GABAAR, GlyR, GABABR, AMPAR, amphiphysin, mGluR5, mGluR1, DPPX, IgLON5, and neurexin-3alpha) and available individual data, to contribute to improve their clinical characterization and identification of age-specific features. Ninety-four children were included in the review (47/94 female, age range 0.2-18 years). The most frequent NSAS were anti-D2R (28/94, 30%), anti-GABAAR (23/94, 24%), and anti-GlyR (22/94, 23%) autoimmunity. The most frequent clinical syndromes were AE, including limbic and basal ganglia encephalitis (57/94, 61%; GABAAR, D2R, GABABR, AMPAR, amphiphysin, and mGluR5), and isolated epileptic syndromes (15/94, 16%; GlyR, GABAAR). With the limitations imposed by the low number of cases, the main distinctive features of our pediatric literature cohort compared to the respective NSAS in adults included: absent/lower tumor association (exception made for anti-mGluR5 autoimmunity, and most evident in anti-amphiphysin autoimmunity); loss of female preponderance (AMPAR); relatively frequent association with preceding viral encephalitis (GABAAR, D2R). Moreover, while SPS and PERM are the most frequent syndromes in adult anti-GlyR and anti-amphiphysin autoimmunity, in children isolated epileptic syndromes and limbic encephalitis appear predominant, respectively. To our knowledge, this is the first systematic review on rare pediatric NSAS. An improved characterization may aid their recognition in children.
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Affiliation(s)
- Claudio Ancona
- Department of Women's and Children's Health, University Hospital of Padova, Padova, Italy
| | - Valentina Masenello
- Department of Women's and Children's Health, University Hospital of Padova, Padova, Italy
| | - Matteo Tinnirello
- Department of Women's and Children's Health, University Hospital of Padova, Padova, Italy
| | - Luca Mattia Toscano
- Department of Women's and Children's Health, University Hospital of Padova, Padova, Italy
| | - Andrea Leo
- Department of Women's and Children's Health, University Hospital of Padova, Padova, Italy
| | - Chiara La Piana
- Department of Women's and Children's Health, University Hospital of Padova, Padova, Italy
| | - Irene Toldo
- Paediatric Neurology and Neurophysiology Unit, Department of Women's and Children's Health, University Hospital of Padova, Padova, Italy
| | - Margherita Nosadini
- Paediatric Neurology and Neurophysiology Unit, Department of Women's and Children's Health, University Hospital of Padova, Padova, Italy.,Neuroimmunology Group, Paediatric Research Institute "Città della Speranza", Padova, Italy
| | - Stefano Sartori
- Paediatric Neurology and Neurophysiology Unit, Department of Women's and Children's Health, University Hospital of Padova, Padova, Italy.,Neuroimmunology Group, Paediatric Research Institute "Città della Speranza", Padova, Italy
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35
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Data on the utilization of paraneoplastic syndrome autoantibody testing at an academic medical center. Data Brief 2021; 39:107578. [PMID: 34877371 PMCID: PMC8627986 DOI: 10.1016/j.dib.2021.107578] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 10/28/2021] [Accepted: 11/10/2021] [Indexed: 12/20/2022] Open
Abstract
Paraneoplastic syndromes are rare conditions associated with characteristic autoantibodies produced by malignancy, although similar autoantibodies and clinical presentations may occur in the absence of any neoplasm. Testing for paraneoplastic syndromes often involves panels of autoantibody assays. While autoantibody testing may reveal or confirm actionable clinical diagnoses, inappropriate utilization of testing may be low yield and further lead to false positives that may confuse the clinical picture. There is thus opportunity to improve patient care by analyzing patterns of paraneoplastic autoantibody test utilization. The data in this article provides results from detailed retrospective review of patients tested by 7 autoantibody tests or test panels offered by two large reference laboratories in the United States. The data include 1,446 tests performed on 1,338 unique patients at an academic medical center. For all results, detailed chart review revealed main category of presenting symptoms, patient location at time of testing (either inpatient or outpatient), sex, age, whether cancer was present at the time of testing or later detected, and the specific results of the testing. The data are summarized by category of testing and specific autoantibodies.
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36
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Lopez JA, Houston SD, Tea F, Merheb V, Lee FXZ, Smith S, McDonald D, Zou A, Liyanage G, Pilli D, Denkova M, Lechner-Scott J, van der Walt A, Barnett MH, Reddel SW, Broadley S, Ramanathan S, Dale RC, Brown DA, Brilot F. Validation of a Flow Cytometry Live Cell-Based Assay to Detect Myelin Oligodendrocyte Glycoprotein Antibodies for Clinical Diagnostics. J Appl Lab Med 2021; 7:12-25. [PMID: 34718586 DOI: 10.1093/jalm/jfab101] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Accepted: 07/29/2021] [Indexed: 11/13/2022]
Abstract
BACKGROUND Myelin oligodendrocyte glycoprotein antibodies (MOG Ab) are essential in the diagnosis of MOG Ab-associated disease (MOGAD). Live cell-based assays (CBAs) are the gold standard for MOG Ab detection with improved sensitivity and specificity over fixed CBAs. A number of testing centers have used flow cytometry for its high throughput and quantitative utility. Presently, there is increasing demand to translate these research-based methods into an accredited routine diagnostic setting. METHODS A flow cytometry live CBA was used to detect MOG Ab in patients with demyelination. Serostatuses were compared between a research-based assay and a streamlined diagnostic assay. Inter-laboratory validation of the streamlined assay was performed in an accredited diagnostic laboratory. Further streamlining was performed by introducing a borderline serostatus range and reducing the number of controls used to determine the positivity threshold. RESULTS High serostatus agreement (98%-100%) was observed between streamlined and research-based assays. Intra- and inter-assay imprecision was improved in the streamlined assay (mean intra- and inter-assay CV = 7.3% and 27.8%, respectively) compared to the research-based assay (mean intra- and inter-assay CV = 11.8% and 33.6%, respectively). Borderline positive and clear positive serostatuses were associated with confirmed phenotypes typical of MOGAD. Compared to using 24 controls, robust serostatus classification was observed when using 13 controls without compromising analytical performance (93%-98.5% agreement). CONCLUSIONS Flow cytometry live CBAs show robust utility in determining MOG Ab serostatus. Streamlining and standardizing use of this assay for diagnostics would improve the accuracy and reliability of routine testing to aid diagnosis and treatment of patients with demyelination.
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Affiliation(s)
- Joseph A Lopez
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia.,Specialty of Child and Adolescent Health, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Samuel D Houston
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia.,School of Biomedical Engineering, The University of Sydney, Sydney, Australia
| | - Fiona Tea
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia.,Specialty of Child and Adolescent Health, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Vera Merheb
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia
| | - Fiona X Z Lee
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia
| | - Sandy Smith
- New South Wales Health Pathology, Institute of Clinical Pathology and Medical Research, Westmead Hospital, Sydney, Australia
| | - David McDonald
- New South Wales Health Pathology, Institute of Clinical Pathology and Medical Research, Westmead Hospital, Sydney, Australia
| | - Alicia Zou
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia.,Specialty of Child and Adolescent Health, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Ganesha Liyanage
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia.,School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Deepti Pilli
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia.,Specialty of Child and Adolescent Health, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Martina Denkova
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia.,School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Jeannette Lechner-Scott
- Hunter Medical Research Institute, Faculty of Medicine and Public Health, The University of Newcastle, Department of Neurology, John Hunter Hospital, Newcastle, Australia
| | - Anneke van der Walt
- Department of Neurosciences, Central Clinical School, Monash University, Melbourne, Australia
| | | | - Stephen W Reddel
- Brain and Mind Centre, The University of Sydney, Sydney, Australia.,Department of Neurology, Concord Repatriation General Hospital, Sydney, Australia
| | - Simon Broadley
- Menzies Health Institute Queensland, Gold Coast Campus, Griffith University Southport, Australia.,Department of Neurology, Gold Coast University Hospital, Southport, Australia
| | - Sudarshini Ramanathan
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia.,Department of Neurology, Concord Repatriation General Hospital, Sydney, Australia.,Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia
| | - Russell C Dale
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia.,Specialty of Child and Adolescent Health, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia.,Brain and Mind Centre, The University of Sydney, Sydney, Australia
| | - David A Brown
- New South Wales Health Pathology, Institute of Clinical Pathology and Medical Research, Westmead Hospital, Sydney, Australia.,Sydney Medical School, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia.,Westmead Institute for Medical Research, Sydney, Australia
| | - Fabienne Brilot
- Brain Autoimmunity Group, Kids Neuroscience Centre, Kids Research at the Children's Hospital at Westmead, Sydney, Australia.,Specialty of Child and Adolescent Health, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia.,School of Medical Sciences, Faculty of Medicine and Health, The University of Sydney, Sydney, Australia.,Brain and Mind Centre, The University of Sydney, Sydney, Australia
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37
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Lockhart A, Boers P. Paraneoplastic neurologic syndromes with multiple neural autoantibodies: A report of two cases. J Neuroimmunol 2021; 358:577665. [PMID: 34329983 DOI: 10.1016/j.jneuroim.2021.577665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 07/01/2021] [Accepted: 07/12/2021] [Indexed: 11/16/2022]
Abstract
We present two patients who presented with classical paraneoplastic syndromes with multiple central nervous system (CNS) autoantibodies in each case. The presence of multiple antibodies made the detection of a malignancy more likely and both patients were subsequently diagnosed with small cell lung carcinoma (SCLC). We highlight that the presence of multiple CNS autoantibodies increases the likelihood of detecting a malignancy but that the clinical presentation and response to treatment can vary despite similar antibody profiles. Clinicians should be alert to the need to search for occult malignancy in patients with multiple CNS autoantibodies.
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Affiliation(s)
- Andrew Lockhart
- University Hosptial Limerick, Dooradoyle, Co Limerick, Ireland.
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38
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Sechi E, Flanagan EP. Antibody-Mediated Autoimmune Diseases of the CNS: Challenges and Approaches to Diagnosis and Management. Front Neurol 2021; 12:673339. [PMID: 34305787 PMCID: PMC8292678 DOI: 10.3389/fneur.2021.673339] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 05/28/2021] [Indexed: 12/25/2022] Open
Abstract
Antibody-mediated disorders of the central nervous system (CNS) are increasingly recognized as neurologic disorders that can be severe and even life-threatening but with the potential for reversibility with appropriate treatment. The expanding spectrum of newly identified autoantibodies targeting glial or neuronal (neural) antigens and associated clinical syndromes (ranging from autoimmune encephalitis to CNS demyelination) has increased diagnostic precision, and allowed critical reinterpretation of non-specific neurological syndromes historically associated with systemic disorders (e.g., Hashimoto encephalopathy). The intracellular vs. cell-surface or synaptic location of the different neural autoantibody targets often helps to predict the clinical characteristics, potential cancer association, and treatment response of the associated syndromes. In particular, autoantibodies targeting intracellular antigens (traditionally termed onconeural autoantibodies) are often associated with cancers, rarely respond well to immunosuppression and have a poor outcome, although exceptions exist. Detection of neural autoantibodies with accurate laboratory assays in patients with compatible clinical-MRI phenotypes allows a definite diagnosis of antibody-mediated CNS disorders, with important therapeutic and prognostic implications. Antibody-mediated CNS disorders are rare, and reliable autoantibody identification is highly dependent on the technique used for detection and pre-test probability. As a consequence, indiscriminate neural autoantibody testing among patients with more common neurologic disorders (e.g., epilepsy, dementia) will necessarily increase the risk of false positivity, so that recognition of high-risk clinical-MRI phenotypes is crucial. A number of emerging clinical settings have recently been recognized to favor development of CNS autoimmunity. These include antibody-mediated CNS disorders following herpes simplex virus encephalitis or occurring in a post-transplant setting, and neurological autoimmunity triggered by TNFα inhibitors or immune checkpoint inhibitors for cancer treatment. Awareness of the range of clinical and radiological manifestations associated with different neural autoantibodies, and the specific settings where autoimmune CNS disorders may occur is crucial to allow rapid diagnosis and early initiation of treatment.
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Affiliation(s)
- Elia Sechi
- Department of Neurology, Mayo Clinic, Rochester, MN, United States.,Department of Medical, Surgical and Experimental Sciences, University of Sassari, Sassari, Italy
| | - Eoin P Flanagan
- Department of Neurology, Mayo Clinic, Rochester, MN, United States.,Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, United States
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39
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Zhang TY, Cai MT, Zheng Y, Lai QL, Shen CH, Qiao S, Zhang YX. Anti-Alpha-Amino-3-Hydroxy-5-Methyl-4-Isoxazolepropionic Acid Receptor Encephalitis: A Review. Front Immunol 2021; 12:652820. [PMID: 34093540 PMCID: PMC8175895 DOI: 10.3389/fimmu.2021.652820] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Accepted: 05/05/2021] [Indexed: 11/23/2022] Open
Abstract
Anti-alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) encephalitis, a rare subtype of autoimmune encephalitis, was first reported by Lai et al. The AMPAR antibodies target against extracellular epitopes of the GluA1 or GluA2 subunits of the receptor. AMPARs are expressed throughout the central nervous system, especially in the hippocampus and other limbic regions. Anti-AMPAR encephalitis was more common in middle-aged women and most patients had an acute or subacute onset. Limbic encephalitis, a classic syndrome of anti-AMPAR encephalitis, was clinically characterized by a subacute disturbance of short-term memory loss, confusion, abnormal behavior and seizure. Magnetic resonance imaging often showed T2/fluid-attenuated inversion-recovery hyperintensities in the bilateral medial temporal lobe. For suspected patients, paired serum and cerebrospinal fluid (CSF) testing with cell-based assay were recommended. CSF specimen was preferred given its higher sensitivity. Most patients with anti-AMPAR encephalitis were complicated with tumors, such as thymoma, small cell lung cancer, breast cancer, and ovarian cancer. First-line treatments included high-dose steroids, intravenous immunoglobulin and plasma exchange. Second-line treatments, including rituximab and cyclophosphamide, can be initiated in patients who were non-reactive to first-line treatment. Most patients with anti-AMPAR encephalitis showed a partial neurologic response to immunotherapy.
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Affiliation(s)
- Tian-Yi Zhang
- Department of Neurology, Tongde Hospital of Zhejiang Province, Hangzhou, China
| | - Meng-Ting Cai
- Department of Neurology, Second Affiliated Hospital School of Medicine Zhejiang University, Hangzhou, China
| | - Yang Zheng
- Department of Neurology, Second Affiliated Hospital School of Medicine Zhejiang University, Hangzhou, China
| | - Qi-Lun Lai
- Department of Neurology, Zhejiang Hospital, Hangzhou, China
| | - Chun-Hong Shen
- Department of Neurology, Second Affiliated Hospital School of Medicine Zhejiang University, Hangzhou, China
| | - Song Qiao
- Department of Neurology, Zhejiang Hospital, Hangzhou, China
| | - Yin-Xi Zhang
- Department of Neurology, Second Affiliated Hospital School of Medicine Zhejiang University, Hangzhou, China
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40
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Balint B, Bhatia KP, Dalmau J. "Antibody of Unknown Significance" (AUS): The Issue of Interpreting Antibody Test Results. Mov Disord 2021; 36:1543-1547. [PMID: 33955060 DOI: 10.1002/mds.28597] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 01/30/2021] [Accepted: 03/05/2021] [Indexed: 11/11/2022] Open
Affiliation(s)
- Bettina Balint
- Department of Neurology, University Hospital, Heidelberg, Germany.,Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, UK
| | - Kailash P Bhatia
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, UK
| | - Josep Dalmau
- Neuroimmunology Program, Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Universitat de Barcelona, Barcelona, Spain.,Service of Neurology, Hospital Clinic de Barcelona, Barcelona, Spain.,Department of Neurology, University of Pennsylvania, Philadelphia, Pennsylvania, USA.,Centro de Investigación Biomédica en Red de Enfermedades Raras, Barcelona, Spain.,Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
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41
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Masi G, Spagni G, Campetella L, Monte G, Sabatelli E, Evoli A, Papi C, Iorio R. Assessing the role of a tissue-based assay in the diagnostic algorithm of autoimmune encephalitis. J Neuroimmunol 2021; 356:577601. [PMID: 33975245 DOI: 10.1016/j.jneuroim.2021.577601] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 04/11/2021] [Accepted: 04/28/2021] [Indexed: 12/11/2022]
Abstract
Tissue-based assay (TBA) is a widely-used method to detect neural autoantibodies, but the diagnostic accuracy for autoimmune encephalitis (AE) has not yet been adequately measured. We retrospectively evaluated the sensitivity and specificity of an indirect immunofluorescence TBA (IIF-TBA) in 159 patients with suspected AE. Serum and cerebrospinal fluid (CSF) specimens were collected and tested from December 2012 to September 2020. In the paired sample analysis, serum testing showed higher sensitivity than CSF, while the latter had higher specificity. Based on these results, we clarify the advantages of using a TBA as the principal screening method for patients with suspected AE.
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Affiliation(s)
- Gianvito Masi
- Dipartimento di Neuroscienze, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Gregorio Spagni
- Dipartimento di Neuroscienze, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Lucia Campetella
- Dipartimento di Neuroscienze, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Gabriele Monte
- Dipartimento di Neuroscienze, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Eleonora Sabatelli
- Dipartimento di Neuroscienze, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Amelia Evoli
- Dipartimento di Neuroscienze, Università Cattolica del Sacro Cuore, Rome, Italy; UOC Neurologia, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, Rome, Italy
| | - Claudia Papi
- Dipartimento di Neuroscienze, Università Cattolica del Sacro Cuore, Rome, Italy
| | - Raffaele Iorio
- Dipartimento di Neuroscienze, Università Cattolica del Sacro Cuore, Rome, Italy; UOC Neurologia, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, Rome, Italy.
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42
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Flanagan EP. Paraneoplastic disorders of the nervous system. J Neurol 2021; 268:4899-4907. [PMID: 33904967 DOI: 10.1007/s00415-021-10570-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 04/13/2021] [Accepted: 04/16/2021] [Indexed: 12/19/2022]
Abstract
This article on paraneoplastic neurologic disorders provides an update on the diagnostic approach, utility and pitfalls of autoantibody testing and emerging settings in which these disorders are encountered. Recognition of the clinical and neuroimaging features accompanying paraneoplastic neurologic disorders is crucial to select those at highest risk who need neural antibody testing and screening for cancer. Cursory knowledge of the antibody assay methodology being ordered is important as the false positive rate varies by the technique utilized for detection. Antibodies can generally be stratified by the location of the target antigen (intraceullar versus cell-surface/synaptic) which informs frequency of cancer association, treatment response and prognosis. The therapeutic approach generally involves detection of the underlying cancer and combinations of oncologic treatments and immunosuppressant medications. The occurrence of paraneoplastic autoimmune neurologic disorders in novel settings, such as with immune checkpoint inhibitor use, has improved understanding of their pathogenesis and increased the likelihood neurologists will encounter such patients in their practice.
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Affiliation(s)
- Eoin P Flanagan
- Department of Neurology, Mayo Clinic, 200 First St SW, Rochester, MN, 55905, USA.
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43
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Hümmert MW, Stadler M, Hambach L, Gingele S, Bredt M, Wattjes MP, Göhring G, Venturini L, Möhn N, Stangel M, Trebst C, Ganser A, Wegner F, Skripuletz T. Severe allo-immune antibody-associated peripheral and central nervous system diseases after allogeneic hematopoietic stem cell transplantation. Sci Rep 2021; 11:8527. [PMID: 33875720 PMCID: PMC8055885 DOI: 10.1038/s41598-021-87989-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 03/24/2021] [Indexed: 01/24/2023] Open
Abstract
Allogeneic hematopoietic stem cell transplantation (alloHSCT) is a curative treatment for hematologic malignancies. Acute and chronic graft-versus-host disease (GvHD) are the major immune-mediated complications after alloHSCT. However, there is controversy whether neurologic complications after alloHSCT might represent manifestations of GvHD. We report three patients who acquired distinct, severe immune-mediated peripheral or central nervous system diseases after alloHSCT without other, concomitant GvHD manifestations. One patient had been diagnosed with B-cell chronic lymphocytic leukemia and two patients with high risk myelodysplastic syndrome. Patient #1 presented as LGI1- and GAD-IgG positive immune-mediated encephalitis, patient #2 was diagnosed with MOG-IgG positive encephalomyelitis, and patient #3 had chronic inflammatory polyneuropathy associated with SSA(Ro)-IgG positive Sjögren's syndrome. 100% donor chimerism was detectable in the peripheral blood in all three. The specific antibodies were undetectable in donors' and patients' blood before alloHSCT suggesting that the antibodies had arisen from the transplanted donor immune system. Early intensive immunotherapy led to improvement of clinical symptoms and stability of the neurological disease, however, at the cost of losing the graft-versus-malignancy effect in one patient. In conclusion, we provide evidence of isolated, severe allo-immune diseases of the peripheral and central nervous system as complications of alloHSCT ("neuro-GvHD"). Interdisciplinary surveillance and thorough diagnostic work-up are needed for early diagnosis and treatment of neuro-immunologic complications after alloHSCT to improve the otherwise poor outcome.
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Affiliation(s)
- Martin W Hümmert
- Department of Neurology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany. .,Department of Clinical Neuroimmunology and Neurochemistry, Hannover Medical School, Hannover, Germany.
| | - Michael Stadler
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany
| | - Lothar Hambach
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany
| | - Stefan Gingele
- Department of Neurology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.,Department of Clinical Neuroimmunology and Neurochemistry, Hannover Medical School, Hannover, Germany
| | - Martin Bredt
- Hannover Medical School, Institute for Pathology, Hannover, Germany
| | - Mike P Wattjes
- Department of Diagnostic and Interventional Neuroradiology, Hannover Medical School, Hannover, Germany
| | - Gudrun Göhring
- Department of Human Genetics, Hannover Medical School, Hannover, Germany
| | - Letizia Venturini
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany
| | - Nora Möhn
- Department of Neurology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.,Department of Clinical Neuroimmunology and Neurochemistry, Hannover Medical School, Hannover, Germany
| | - Martin Stangel
- Department of Neurology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.,Department of Clinical Neuroimmunology and Neurochemistry, Hannover Medical School, Hannover, Germany
| | - Corinna Trebst
- Department of Neurology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.,Department of Clinical Neuroimmunology and Neurochemistry, Hannover Medical School, Hannover, Germany
| | - Arnold Ganser
- Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany
| | - Florian Wegner
- Department of Neurology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.,Department of Clinical Neuroimmunology and Neurochemistry, Hannover Medical School, Hannover, Germany
| | - Thomas Skripuletz
- Department of Neurology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625, Hannover, Germany.,Department of Clinical Neuroimmunology and Neurochemistry, Hannover Medical School, Hannover, Germany
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44
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Balint B. Are Antibody Panels Under-Utilized in Movement Disorders Diagnosis? Yes. Mov Disord Clin Pract 2021; 8:341-346. [PMID: 33816660 PMCID: PMC8015910 DOI: 10.1002/mdc3.13171] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 01/24/2021] [Accepted: 01/26/2021] [Indexed: 11/21/2022] Open
Affiliation(s)
- Bettina Balint
- Department of Neurology University Hospital Heidelberg Heidelberg Germany
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