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Zielen S, Duecker RP, Woelke S, Donath H, Bakhtiar S, Buecker A, Kreyenberg H, Huenecke S, Bader P, Mahlaoui N, Ehl S, El-Helou SM, Pietrucha B, Plebani A, van der Flier M, van Aerde K, Kilic SS, Reda SM, Kostyuchenko L, McDermott E, Galal N, Pignata C, Pérez JLS, Laws HJ, Niehues T, Kutukculer N, Seidel MG, Marques L, Ciznar P, Edgar JDM, Soler-Palacín P, von Bernuth H, Krueger R, Meyts I, Baumann U, Kanariou M, Grimbacher B, Hauck F, Graf D, Granado LIG, Prader S, Reisli I, Slatter M, Rodríguez-Gallego C, Arkwright PD, Bethune C, Deripapa E, Sharapova SO, Lehmberg K, Davies EG, Schuetz C, Kindle G, Schubert R. Simple Measurement of IgA Predicts Immunity and Mortality in Ataxia-Telangiectasia. J Clin Immunol 2021; 41:1878-1892. [PMID: 34477998 PMCID: PMC8604875 DOI: 10.1007/s10875-021-01090-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 06/25/2021] [Indexed: 11/29/2022]
Abstract
Patients with ataxia-telangiectasia (A-T) suffer from progressive cerebellar ataxia, immunodeficiency, respiratory failure, and cancer susceptibility. From a clinical point of view, A-T patients with IgA deficiency show more symptoms and may have a poorer prognosis. In this study, we analyzed mortality and immunity data of 659 A-T patients with regard to IgA deficiency collected from the European Society for Immunodeficiencies (ESID) registry and from 66 patients with classical A-T who attended at the Frankfurt Goethe-University between 2012 and 2018. We studied peripheral B- and T-cell subsets and T-cell repertoire of the Frankfurt cohort and survival rates of all A-T patients in the ESID registry. Patients with A-T have significant alterations in their lymphocyte phenotypes. All subsets (CD3, CD4, CD8, CD19, CD4/CD45RA, and CD8/CD45RA) were significantly diminished compared to standard values. Patients with IgA deficiency (n = 35) had significantly lower lymphocyte counts compared to A-T patients without IgA deficiency (n = 31) due to a further decrease of naïve CD4 T-cells, central memory CD4 cells, and regulatory T-cells. Although both patient groups showed affected TCR-ß repertoires compared to controls, no differences could be detected between patients with and without IgA deficiency. Overall survival of patients with IgA deficiency was significantly diminished. For the first time, our data show that patients with IgA deficiency have significantly lower lymphocyte counts and subsets, which are accompanied with reduced survival, compared to A-T patients without IgA deficiency. IgA, a simple surrogate marker, is indicating the poorest prognosis for classical A-T patients. Both non-interventional clinical trials were registered at clinicaltrials.gov 2012 (Susceptibility to infections in ataxia-telangiectasia; NCT02345135) and 2017 (Susceptibility to Infections, tumor risk and liver disease in patients with ataxia-telangiectasia; NCT03357978)
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Affiliation(s)
- Stefan Zielen
- Division of Allergology, Pulmonology and Cystic Fibrosis, Department for Children and Adolescents, Goethe University, Frankfurt, Germany
| | - Ruth Pia Duecker
- Division of Allergology, Pulmonology and Cystic Fibrosis, Department for Children and Adolescents, Goethe University, Frankfurt, Germany.
| | - Sandra Woelke
- Division of Allergology, Pulmonology and Cystic Fibrosis, Department for Children and Adolescents, Goethe University, Frankfurt, Germany
| | - Helena Donath
- Division of Allergology, Pulmonology and Cystic Fibrosis, Department for Children and Adolescents, Goethe University, Frankfurt, Germany
| | - Sharhzad Bakhtiar
- Division for Stem Cell Transplantation, Immunology and Intensive Care Unit, Department for Children and Adolescents, Goethe University, Frankfurt, Germany
| | - Aileen Buecker
- Division of Allergology, Pulmonology and Cystic Fibrosis, Department for Children and Adolescents, Goethe University, Frankfurt, Germany
| | - Hermann Kreyenberg
- Division for Stem Cell Transplantation, Immunology and Intensive Care Unit, Department for Children and Adolescents, Goethe University, Frankfurt, Germany
| | - Sabine Huenecke
- Division for Stem Cell Transplantation, Immunology and Intensive Care Unit, Department for Children and Adolescents, Goethe University, Frankfurt, Germany
| | - Peter Bader
- Division for Stem Cell Transplantation, Immunology and Intensive Care Unit, Department for Children and Adolescents, Goethe University, Frankfurt, Germany
| | - Nizar Mahlaoui
- Pediatric Immunology-Hematology and Rheumatology Unit, French National Reference Center for Primary Immune Deficiencies (CEREDIH), Necker Children's University Hospital, Assistance Publique-Hôpitaux de Paris (AP-HP), Paris, France
| | - Stephan Ehl
- Institute for Immunodeficiency, Center for Chronic Immunodeficiency (CCI), Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Sabine M El-Helou
- Institute for Immunodeficiency, Center for Chronic Immunodeficiency (CCI), Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- RESIST - Cluster of Excellence 2155 To Hanover Medical School, Satellite Center Freiburg, Freiburg, Germany
- Department of Rheumatology and Immunology, Hannover Medical School, Hannover, Germany
| | - Barbara Pietrucha
- Department of Immunology, The Children's Memorial Health Institute, Av. Dzieci Polskich 20, 04-730, Warsaw, Poland
| | - Alessandro Plebani
- Pediatrics Clinic and Institute for Molecular Medicine A. Nocivelli, Department of Clinical and Experimental Sciences, University of Brescia and ASST-Spedali Civili di Brescia, Brescia, Italy
| | - Michiel van der Flier
- Section Pediatric Infectious Diseases, Laboratory of Medical Immunology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Koen van Aerde
- Department of Pediatrics, Amalia's Children Hospital, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Sara S Kilic
- Department of Pediatric Immunology and Rheumatology, the School of Medicine, Uludag University, Bursa, Turkey
| | - Shereen M Reda
- Department of Pediatrics, Children's Hospital, Faculty of Medicine, Ain Shams University, Cairo, Egypt
| | - Larysa Kostyuchenko
- Center of Pediatric Immunology, Western Ukrainian Specialized Children's Medical Centre, Lviv, Ukraine
| | - Elizabeth McDermott
- Clinical Immunology and Allergy Unit, Nottingham University Hospitals, Nottingham, UK
| | - Nermeen Galal
- Department of Pediatrics, Cairo University Specialized Pediatric Hospital, Cairo, Egypt
| | - Claudio Pignata
- Department of Translational Medical Sciences, Section of Pediatrics, Federico II University, Naples, Italy
| | - Juan Luis Santos Pérez
- Infectious Diseases and Immunodeficiencies Unit, Service of Pediatrics, Hospital Universitario Virgen de Las Nieves, Granada, Spain
| | - Hans-Juergen Laws
- Department of Pediatric Oncology, Hematology and Clinical Immunology, Medical Faculty, Center of Child and Adolescent Health, Heinrich-Heine University, Duesseldorf, Germany
| | - Tim Niehues
- Centre for Child and Adolescent Health, Helios Klinikum Krefeld, Krefeld, Germany
| | - Necil Kutukculer
- Faculty of Medicine, Department of Pediatric Immunology, Ege University, Izmir, Turkey
| | - Markus G Seidel
- Research Unit for Pediatric Hematology and Immunology, Division of Pediatric Hemato-Oncology, Department of Pediatrics and Adolescent Medicine, Medical University Graz, Graz, Austria
| | - Laura Marques
- Pediatric Department, Infectious Diseases and Immunodeficiencies Unit, Porto Hospital Center, Porto, Portugal
| | - Peter Ciznar
- Pediatric Department, Faculty of Medicine, Children University Hospital in Bratislava, Comenius University in Bratislava, Bratislava, Slovakia
| | | | - Pere Soler-Palacín
- Pediatric Infectious Diseases and Immunodeficiencies Unit, Vall D'Hebron Research Institute, Hospital Universitari Vall D'Hebron, Universitat Autònoma de Barcelona, Barcelona, Catalonia, Spain
| | - Horst von Bernuth
- Department of Pediatric Pneumology, Immunology and Intensive Care, Charité - Universitätsmedizin Berlin, Berlin, Germany
- Department of Immunology, Labor Berlin Charité - Vivantes GmbH, Berlin, Germany
- Berlin Center for Regenerative Therapies (BCRT), Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Renate Krueger
- Department of Pediatric Pneumology, Immunology and Intensive Care, Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Isabelle Meyts
- Department of Pediatrics, University Hospitals Leuven, and the Laboratory for Inborn Errors of Immunity, Department of Microbiology, Immunology and Transplantation, KU Leuven, Leuven, Belgium
| | - Ulrich Baumann
- Department of Paediatric Pulmonology, Allergy and Neonatology, Hannover Medical School, Hannover, Germany
| | - Maria Kanariou
- Department of Immunology and Histocompatibility, Centre for Primary Immunodeficiencies, "Aghia Sophia" Children's Hospital, Athens, Greece
| | - Bodo Grimbacher
- Institute for Immunodeficiency, Center for Chronic Immunodeficiency (CCI), Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- RESIST - Cluster of Excellence 2155 To Hanover Medical School, Satellite Center Freiburg, Freiburg, Germany
- DZIF-German Center for Infection Research, Satellite Center Freiburg, Freiburg, Germany; Centre for Integrative Biological Signalling Studies, Albert-Ludwigs University, Freiburg, Germany
| | - Fabian Hauck
- Department of Pediatrics, Dr. Von Hauner Children's Hospital, University Hospital, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Dagmar Graf
- MVZ Dr. Reising-Ackermann Und Kollegen, Leipzig, Germany
| | - Luis Ignacio Gonzalez Granado
- Primary Immunodeficiencies Unit, Pediatrics, Hospital 12 Octubre, Complutense University School of Medicine, Madrid, Spain
| | - Seraina Prader
- Division of Immunology and Children's Research Center, University Children's Hospital Zurich, Zurich, Switzerland
| | - Ismail Reisli
- Department of Pediatrics, Division of Pediatric Immunology and Allergy, Meram Medical Faculty, Necmettin Erbakan University, Konya, Turkey
| | - Mary Slatter
- Primary Immunodeficiency Group, Paediatric Immunology and Haematopoietic Stem Cell Transplantation, Translational and Clinical Research Institute, Great North Childrens' Hospital, Newcastle University, Newcastle upon Tyne, UK
| | - Carlos Rodríguez-Gallego
- Department of Immunology, Dr. Negrin University Hospital of Gran Canaria, University Fernando Pessoa Canarias, Las Palmas de Gran Canaria, Spain
| | - Peter D Arkwright
- Lydia Becker Institute of Immunology and Inflammation, University of Manchester and Royal Manchester Children's Hospital, Manchester, UK
| | | | - Elena Deripapa
- National Medical Research Center of Pediatric Hematology, Oncology and Immunology, Moscow, Russia
| | - Svetlana O Sharapova
- Research Department, Belarusian Research Center for Pediatric Oncology, Hematology and Immunology, Minsk region, Minsk, Belarus
| | - Kai Lehmberg
- Division for Pediatric Stem Cell Transplantation and Immunology, Clinic for Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - E Graham Davies
- Great Ormond Street Hospital and UCL Great Ormond Street Institute of Child Health, London, UK
| | - Catharina Schuetz
- Department of Pediatrics, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Gerhard Kindle
- Institute for Immunodeficiency, Center for Chronic Immunodeficiency (CCI), Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
- FREEZE Biobank, Center for Biobanking, Medical Center and Faculty of Medicine, University of Freiburg, Breisacher Str. 115, 79106, Freiburg, Germany
| | - Ralf Schubert
- Division of Allergology, Pulmonology and Cystic Fibrosis, Department for Children and Adolescents, Goethe University, Frankfurt, Germany
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Chen Y, Chen G, Li J, Huang YY, Li Y, Lin J, Chen LZ, Lu JP, Wang YQ, Wang CX, Pan LK, Xia XF, Yi X, Chen CB, Zheng XW, Guo ZQ, Pan JJ. Association of Tumor Protein p53 and Ataxia-Telangiectasia Mutated Comutation With Response to Immune Checkpoint Inhibitors and Mortality in Patients With Non-Small Cell Lung Cancer. JAMA Netw Open 2019; 2:e1911895. [PMID: 31539077 PMCID: PMC6755545 DOI: 10.1001/jamanetworkopen.2019.11895] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
IMPORTANCE Immune checkpoint inhibitors (ICIs) can elicit durable antitumor responses in patients with non-small cell lung cancer (NSCLC), but only 20% to 25% of patients respond to treatment. As important genes in the DNA damage response pathway, comutation in the tumor protein p53 (TP53) and ataxia-telangiectasia mutated (ATM) genes may be associated with genomic instability and hypermutation. However, the prevalence of TP53 and ATM comutation and its association with response to ICIs are not fully understood. OBJECTIVE To examine the prevalence of the TP53 and ATM comutation, the potential mechanism, and its association with response to ICIs among patients with NSCLC. DESIGN, SETTING, AND PARTICIPANTS This multiple-cohort study included patients with NSCLC from the Geneplus Institute, the Cancer Genome Atlas (TCGA), and the Memorial Sloan Kettering Cancer Center (MSKCC) databases and from the POPLAR and OAK randomized controlled trials. Samples in the Geneplus cohort were collected and analyzed from April 30, 2015, through February 28, 2019. Data from TCGA, the MSKCC, and the POPLAR and OAK cohorts were obtained on January 1, 2019, and analyzed from January 1 to April 10, 2019. Next-generation sequencing assays were performed on tumor samples by the Geneplus Institute. Genomic, transcriptomic, and clinical data were obtained from TCGA and MSKCC databases. EXPOSURES Comprehensive genetic profiling was performed to determine the prevalence of TP53 and ATM comutation and its association with prognosis and response to ICIs. MAIN OUTCOMES AND MEASURES The main outcomes were TP53 and ATM comutation frequency, overall survival (OS), progression-free survival, gene set enrichment analysis, and immune profile in NSCLC. RESULTS Patients with NSCLC analyzed in this study included 2020 patients in the Geneplus cohort (mean [SD] age, 59.5 [10.5] years; 1168 [57.8%] men), 1031 patients in TCGA cohort (mean [SD] age, 66.2 [9.5] years; 579 [56.2%] men), 1527 patients in the MSKCC cohort (662 [43.4%] men), 350 patients in the MSKCC cohort who were treated with ICIs (mean [SD] age, 61.4 [13.8] years; 170 [48.6%] men), and 853 patients in the POPLAR and OAK cohort (mean [SD] age, 63.0 [9.1] years; 527 [61.8%] men). Sites of TP53 and ATM comutation were found scattered throughout the genes, and no significant difference was observed in the frequency of TP53 and ATM comutation within the histologic subtypes and driver genes. In 5 independent cohorts of patients with NSCLC, TP53 and ATM comutation was associated with a significantly higher tumor mutation burden compared with the sole mutation and with no mutation (TCGA, MSKCC, Geneplus, and POPLAR and OAK cohort). Among patients treated with ICIs in the MSKCC cohort, TP53 and ATM comutation was associated with better OS than a single mutation and no mutation among patients with any cancer (median OS: TP53 and ATM comutation, not reached; TP53 mutation alone, 14.0 months; ATM mutation alone, 40.0 months; no mutation, 22.0 months; P = .001; NSCLC median OS: TP53 and ATM comutation, not reached; TP53 mutation alone, 11.0 months; ATM mutation alone, 16.0 months; no mutation, 14.0 months; P = .24). Similar results were found in the POPLAR and OAK cohort in which the disease control benefit rate, progression-free survival, and OS were all greater in patients with the TP53 and ATM comutation compared with the other 3 groups (median progression-free survival: TP53 and ATM comutation, 10.4 months; TP53 mutation, 1.6 months; ATM mutation, 3.5 months; no mutation, 2.8 months; P = .01; median OS: TP53 and ATM comutation, 22.1 months; TP53 mutation, 8.3 months; ATM mutation, 15.8 months; no mutation, 15.3 months; P = .002). CONCLUSIONS AND RELEVANCE This study's findings suggest that the TP53 and ATM comutation occurs in a subgroup of patients with NSCLC and is associated with an increased tumor mutation burden and response to ICIs. This suggests that TP53 and ATM comutation may have implications as a biomarker for guiding ICI treatment.
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Affiliation(s)
- Yu Chen
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Medical Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Gang Chen
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Department of Pathology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Jin Li
- Geneplus-Beijing Institute, Beijing, China
| | | | - Yi Li
- Fujian Medical University Cancer Hospital, Fuzhou, China
| | - Jing Lin
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Medical Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Li-Zhu Chen
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Medical Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Jian-Ping Lu
- Department of Pathology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Yu-Qi Wang
- Geneplus-Beijing Institute, Beijing, China
| | | | - Leong Kin Pan
- China Certification and Inspection Group, Kuok Kim Medical Center III, Macao, China
- Hui Xian Medical Center, Macao, China
| | | | - Xin Yi
- Geneplus-Beijing Institute, Beijing, China
| | - Chuan-Ben Chen
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Radiation Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Xiong-Wei Zheng
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Department of Pathology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Zeng-Qing Guo
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Medical Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
| | - Jian-Ji Pan
- Fujian Provincial Key Laboratory of Translational Cancer Medicine, Fuzhou, China
- Cancer Bio-immunotherapy Center, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
- Department of Radiation Oncology, Fujian Medical University Cancer Hospital and Fujian Cancer Hospital, Fuzhou, China
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van Os NJH, Chessa L, Weemaes CMR, van Deuren M, Fiévet A, van Gaalen J, Mahlaoui N, Roeleveld N, Schrader C, Schindler D, Taylor AMR, Van de Warrenburg BPC, Dörk T, Willemsen MAAP. Genotype-phenotype correlations in ataxia telangiectasia patients with ATM c.3576G>A and c.8147T>C mutations. J Med Genet 2019; 56:308-316. [PMID: 30819809 DOI: 10.1136/jmedgenet-2018-105635] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 11/21/2018] [Accepted: 12/19/2018] [Indexed: 11/03/2022]
Abstract
BACKGROUND Ataxia telangiectasia (A-T) is a neurodegenerative disorder. While patients with classic A-T generally die in their 20s, some patients with variant A-T, who have residual ataxia-telangiectasia mutated (ATM) kinase activity, have a milder phenotype. We noticed two commonly occurring ATM mutations that appeared to be associated with prolonged survival and decided to study patients carrying one of these mutations. METHODS Data were retrospectively collected from the Dutch, Italian, German and French A-T cohorts. To supplement these data, we searched the literature for patients with identical genotypes. RESULTS This study included 35 patients who were homozygous or compound heterozygous for the ATM c.3576G>A; p.(Ser1135_Lys1192del58) mutation and 24 patients who were compound heterozygous for the ATM c.8147T>C; p.(Val2716Ala) mutation. Compared with 51 patients with classic A-T from the Dutch cohort, patients with ATM c.3576G>A had a longer survival and were less likely to develop cancer, respiratory disease or immunodeficiency. This was also true for patients with ATM c.8147T>C, who additionally became wheelchair users later in life and had fewer telangiectasias. The oldest patient with A-T reported so far was a 78-year-old patient who was compound heterozygous for ATM c.8147T>C. ATM kinase activity was demonstrated in cells from all patients tested with the ATM c.8147T>C mutant protein and only at a low level in some patients with ATM c.3576G>A. CONCLUSION Compared with classic A-T, the presence of ATM c.3576G>A results in a milder classic phenotype. Patients with ATM c.8147T>C have a variant phenotype with prolonged survival, which in exceptional cases may approach a near-normal lifespan.
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Affiliation(s)
- Nienke J H van Os
- Department of Pediatric Neurology, Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, the Netherlands
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Luciana Chessa
- Department of Clinical and Molecular Medicine, Sapienza Università di Roma, Rome, Italy
| | - Corry M R Weemaes
- Department of Pediatrics, Pediatric Infectious Disease and Immunology, Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Marcel van Deuren
- Department of Internal Medicine, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Alice Fiévet
- INSERM UMR 830, Institut de recherche, Institut Curie, PSL Research University, Paris, France
- Service de Génétique, Institut Curie Hôpital, Paris, France
| | - Judith van Gaalen
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Nizar Mahlaoui
- French National Reference Center for Primary Immune Deficiencies (CEREDIH), Pediatric Immuno-Haematology and Rheumatology Unit, Biostatistics Unit, Necker Enfants Malades University Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France
- Laboratory of Human Genetics of Infectious Diseases, Necker Branch, INSERM UMR 1163, Imagine Institute, Paris, France
- INSERM UMR 1163, Sorbonne Paris Cité, Imagine Institute, Paris Descartes University, Paris, France
| | - Nel Roeleveld
- Department of Health Evidence, Radboud Institute for Health Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
| | | | - Detlev Schindler
- Institute of Human Genetics, University of Wurzburg, Wurzburg, Germany
| | | | - Bart P C Van de Warrenburg
- Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Thilo Dörk
- Gynaecology Research Unit, Hannover Medical School, Hannover, Germany
| | - Michèl A A P Willemsen
- Department of Pediatric Neurology, Amalia Children's Hospital, Radboud University Medical Center, Nijmegen, the Netherlands
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Krauthammer A, Lahad A, Goldberg L, Sarouk I, Weiss B, Somech R, Soudack M, Pessach IM. Elevated IgM levels as a marker for a unique phenotype in patients with Ataxia telangiectasia. BMC Pediatr 2018; 18:185. [PMID: 29866155 PMCID: PMC5987459 DOI: 10.1186/s12887-018-1156-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Accepted: 05/22/2018] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Ataxia telangiectasia (AT) is a rare, multi-systemic, genetic disorder. Mutations in the ATM gene cause dysfunction in cell-cycle, apoptosis and V (D) J recombination leading to neurodegeneration, cellular, humoral immunodeficiencies and predisposition to malignancies. Previous studies have suggested that a sub-group of AT patients with elevated IgM levels have a distinct and more severe phenotype. In the current study we aimed to better characterize this group of patients. METHODS We performed a retrospective review of 46 patient records, followed from January 1986 to January 2015 at the Israeli National AT Center. Demographic, clinical, radiological, laboratory data was reviewed and compared between AT patients with elevated IgM levels (EIgM) and patients with normal IgM levels (NIgM). RESULTS 15/46(32.6%) patients had significantly elevated IgM levels. This group had a unique phenotype characterized mainly by increased risk of infection and early mortality. Colonization of lower respiratory tract with Mycobacterium gordonae and Pseudomonas aeruginosa as well as viral skin infections were more frequent in EIgM patients. Patients with NIgM had a significantly longer survival as compared to patients with EIgM but had an increased incidence of fatty liver or cirrhosis. T-cell recombination excision circles and kappa-deleting element recombination circle levels were significantly lower in the EIgM group, suggesting an abnormal class switching in this group. CONCLUSIONS EIgM in AT patients are indicative of a more severe phenotype that probably results from a specific immune dysfunction. EIgM in AT should be considered a unique AT phenotype that may require different management.
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Affiliation(s)
- Alexander Krauthammer
- Department of Pediatrics, The Edmond and Lily Safra Children’s Hospital, 52625 Tel- Hashomer, Israel
- Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Avishay Lahad
- Department of Pediatrics, The Edmond and Lily Safra Children’s Hospital, 52625 Tel- Hashomer, Israel
- Pediatric Gastroenterology Unit, The Edmond and Lily Safra Children’s Hospital, Tel- Hashomer, Israel
| | - Lior Goldberg
- Department of Pediatrics, The Edmond and Lily Safra Children’s Hospital, 52625 Tel- Hashomer, Israel
- Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Ifat Sarouk
- Department of Pediatrics, The Edmond and Lily Safra Children’s Hospital, 52625 Tel- Hashomer, Israel
- Pediatric Pulmonary Unit, The Edmond and Lily Safra Children’s Hospital, Tel- Hashomer, Israel
| | - Batia Weiss
- Pediatric Gastroenterology Unit, The Edmond and Lily Safra Children’s Hospital, Tel- Hashomer, Israel
- Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Raz Somech
- Department of Pediatrics, The Edmond and Lily Safra Children’s Hospital, 52625 Tel- Hashomer, Israel
- Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Michalle Soudack
- Department of Pediatrics, The Edmond and Lily Safra Children’s Hospital, 52625 Tel- Hashomer, Israel
- Pediatric Radiology Unit, The Edmond and Lily Safra Children’s Hospital, Tel- Hashomer, Israel
| | - Itai M. Pessach
- The Claudio Cohen Department of Pediatric Intensive Care, The Edmond and Lily Safra Children’s Hospital, Tel- Hashomer, Israel
- Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
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Bhatt JM, Bush A, van Gerven M, Nissenkorn A, Renke M, Yarlett L, Taylor M, Tonia T, Warris A, Zielen S, Zinna S, Merkus PJFM. ERS statement on the multidisciplinary respiratory management of ataxia telangiectasia. Eur Respir Rev 2015; 24:565-81. [PMID: 26621971 PMCID: PMC9487625 DOI: 10.1183/16000617.0066-2015] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 09/08/2015] [Indexed: 11/05/2022] Open
Abstract
Ataxia telangiectasia (A-T) is a rare, progressive, multisystem disease that has a large number of complex and diverse manifestations which vary with age. Patients with A-T die prematurely with the leading causes of death being respiratory diseases and cancer. Respiratory manifestations include immune dysfunction leading to recurrent upper and lower respiratory infections; aspiration resulting from dysfunctional swallowing due to neurodegenerative deficits; inefficient cough; and interstitial lung disease/pulmonary fibrosis. Malnutrition is a significant comorbidity. The increased radiosensitivity and increased risk of cancer should be borne in mind when requesting radiological investigations. Aggressive proactive monitoring and treatment of these various aspects of lung disease under multidisciplinary expertise in the experience of national multidisciplinary clinics internationally forms the basis of this statement on the management of lung disease in A-T. Neurological management is outwith the scope of this document.
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Affiliation(s)
- Jayesh M Bhatt
- Nottingham Children's Hospital, UK Paediatric National Clinic, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Andrew Bush
- Imperial College and Royal Brompton Hospital, London, UK
| | - Marjo van Gerven
- Dept of Paediatrics, Division of Respiratory Medicine, Amalia Children's Hospital Radboud, University Medical Centre, Nijmegen, The Netherlands
| | - Andreea Nissenkorn
- Rare Diseases Service and Pediatric Neurology Unit, Edmond and Lilly Safra Pediatric Hospital, Sheba Medical Center, Tel HaShomer, Israel Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Michael Renke
- Dept of Allergology, Pneumology and Cystic Fibrosis, Children's Hospital, Goethe-University Theodor-Stern Kai, Frankfurt/Main, Germany
| | | | - Malcolm Taylor
- School of Cancer Sciences, University of Birmingham, Birmingham, UK
| | - Thomy Tonia
- Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland
| | - Adilia Warris
- Institute of Medical Sciences, University of Aberdeen and the Royal Aberdeen Children's Hospital, Aberdeen, UK
| | - Stefan Zielen
- Dept of Allergology, Pneumology and Cystic Fibrosis, Children's Hospital, Goethe-University Theodor-Stern Kai, Frankfurt/Main, Germany
| | - Shairbanu Zinna
- Nottingham Children's Hospital, UK Paediatric National Clinic, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Peter J F M Merkus
- Dept of Paediatrics, Division of Respiratory Medicine, Amalia Children's Hospital Radboud, University Medical Centre, Nijmegen, The Netherlands
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Abstract
Ataxia telangiectasia is a rare, multiorgan neurodegenerative disorder with enhanced vulnerability to cancer and infection. Median survival in two large cohorts of patients with this disease, one prospective and one retrospective, is 25 and 19 years, with a wide range. Life expectancy does not correlate well with severity of neurological impairment.
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Affiliation(s)
- T O Crawford
- Department of Neurology, The Johns Hopkins Hospital, Baltimore, Maryland 21287, USA.
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7
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Abstract
OBJECTIVE To characterize the immunodeficiency in ataxia-telangiectasia (A-T) and to determine whether the immunodeficiency is progressive and associated with increased susceptibility to infections. STUDY DESIGN Records of 100 consecutive patients with A-T from the Johns Hopkins Ataxia-Telangiectasia Clinical Center (ATCC) were reviewed. RESULTS Immunoglobulin (Ig) deficiencies are common, affecting IgG4 in 65% of patients, IgA in 63%, IgG2 in 48%, IgE in 23%, and IgG in 18%. Lymphopenia affected 71% of patients, with reduced B-lymphocyte number in 75%, CD4 T lymphocytes in 69%, and CD8 T lymphocytes in 51%. There was no trend for increased frequency or severity of immune abnormalities with age. Recurrent upper and lower respiratory tract infections were frequent: otitis media in 46% of patients, sinusitis in 27%, bronchitis in 19%, and pneumonia in 15%. Sepsis occurred in 5 patients, in 2 patients concurrent with cancer chemotherapy. Warts affected 17% of patients, herpes simplex 8%, molluscum contagiosum 5%, candidal esophagitis 3%, and herpes zoster 2%. Uncomplicated varicella infection occurred in 44% of patients; 2 patients had more than one clinical episode. No patient had Pneumocystis jerovici pneumonia or a complication of live viral vaccine. CONCLUSIONS In spite of the high prevalence of laboratory immunologic abnormalities, systemic bacterial, severe viral, and opportunistic infections are uncommon in A-T. Cross-sectional analysis suggests that the immune defect is rarely progressive.
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Affiliation(s)
- Anna Nowak-Wegrzyn
- Eudowood Division of Pediatric Allergy and Immunology, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD 21287-3923, USA
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Niehues T, Schellong G, Dörffel W, Bucsky P, Mann G, Körholz D, Göbel U. Immunodeficiency and Hodgkin's Disease: Treatment and Outcome in the DAL HD78 - 90 and GPOH HD95 Studies. Klin Padiatr 2003; 215:315-20. [PMID: 14677095 DOI: 10.1055/s-2003-45498] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
BACKGROUND Excellent treatment results have been obtained for children with Hodgkin's disease (HD). Children with immunodeficiencies who present with HD do not have such a favourable prognosis. PATIENTS AND METHODS A systematic literature search using MEDLINE and a search for immunodeficiencies in the database of the trials DAL HD78-HD90 and GPOH HD95 (n = 2263) were carried out. Age, sex, type of immunodeficiency, disease stage, treatment and outcome of all HD cases with known immunodeficiency were recorded. RESULTS 28 published cases and 13 children in the DAL/GPOH trials were identified. 19/28 and 6/13 patients have immunodeficiencies with increased DNA breakage (24/25 ataxia teleangiectasia, 1/25 Nijmegen breakage syndrome) who present largely with stage III - IV HD. Among the published cases with increased DNA breakage there is only one child who is surviving 16 months after diagnosis, while there are 6/9 survivors in the group of immunodeficiencies without increased DNA breakage. Similarly, only 1/6 children survives in the group of children reported to the DAL/GPOH trials suffering from HD and immunodeficiency with increased DNA breakage, while the outcome in children suffering from immunodeficiency without increased DNA breakage is much better with 5/7 survivors. CONCLUSIONS The literature review and data analysis of the DAL/GPOH studies show that treatment outcome is almost invariably fatal in children with HD and immunodeficiency with increased DNA breakage. Thus we propose to treat children with or without increased DNA breakage differently to improve the outcome of Hodgkin's disease in the subgroup of children with immunodeficiency.
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Affiliation(s)
- T Niehues
- Klinik für Kinder-Onkologie, -Hämatologie und -Immunologie, Universitätskinderklinik Düsseldorf, Germany.
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9
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Abstract
BACKGROUND Mutations at the ataxia-telangiectasia locus cause a distinctive autosomal recessive syndrome in homozygotes and predispose heterozygotes to cancer and ischemic heart disease. OBJECTIVE To examine mortality rates among persons carrying a mutated ataxia-telangiectasia gene. DESIGN Retrospective cohort study. SETTING The United States and Canada. PARTICIPANTS 405 grandparents of patients with ataxia-telangiectasia. MEASUREMENTS Ages at death and risk for death (from all causes, cancer, ischemic heart disease, and other causes) among carriers and noncarriers of ataxia-telangiectasia mutations. RESULTS Compared with noncarriers, carriers of a mutated ataxia-telangiectasia allele had a significantly increased risk for death at 20 through 79 years of age (relative risk, 1.9 [95% CI, 1.3 to 2.8]) (P < 0.001). On average, carriers died 7 to 8 years earlier than noncarriers. Cancer caused most of the excess deaths, and ischemic heart disease caused the remainder. Among carriers, relative risk for death from cancer and ischemic heart disease before 80 years of age was 2.6 (CI, 1.4 to 4.7; P = 0.002) and 2.0 (CI, 1.0 to 4.0; P = 0.062), respectively. Compared with noncarriers, carriers who died of cancer were a mean of 4 years younger (P > 0.2) and carriers who died of ischemic heart disease were a mean of 11 years younger (P = 0.006). CONCLUSION Carriers of mutations at the ataxia-telangiectasia locus, who make up 1.4% to 2% of the general population, have a higher mortality rate and an earlier age at death from cancer and ischemic heart disease than noncarriers.
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Affiliation(s)
- Y Su
- The Institute for the Genetic Analysis of Common Diseases, New York Medical College, 4 Skyline Drive, Hawthorne, NY 10532, USA
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Becker-Catania SG, Chen G, Hwang MJ, Wang Z, Sun X, Sanal O, Bernatowska-Matuszkiewicz E, Chessa L, Lee EY, Gatti RA. Ataxia-telangiectasia: phenotype/genotype studies of ATM protein expression, mutations, and radiosensitivity. Mol Genet Metab 2000; 70:122-33. [PMID: 10873394 DOI: 10.1006/mgme.2000.2998] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Previous studies on a limited number of ataxia-telangiectasia (A-T) patients with detectable levels of intracellular ATM protein have suggested a genotype/phenotype correlation. We sought to elucidate this possible correlation by comparing ATM protein levels with mutation types, radiosensitivity, and clinical phenotype. In this study, Western blot analysis was used to measure ATM protein in lysates of lymphoblastoid cell lines (LCLs) from 123 unrelated A-T patients, 10 A-T heterozygotes, and 10 patients with phenotypes similar to A-T. Our Western blot protocol can detect the presence of ATM protein in as little as 1 microg of total protein; at least 25 microg of protein was tested for each individual. ATM protein was absent in 105 of the 123 patients (85%); most of these patients had truncating mutations. The remaining subset of 18 patients (15%) had reduced levels of normal-sized ATM protein; missense mutations were more common in this subset. We used a colony survival assay to characterize the phenotypic response of the LCLs to radiation exposure; patients with or without detectable ATM protein were typically radiosensitive. Nine of 10 A-T heterozygotes also had reduced expression of ATM, indicating that both alleles contribute to ATM protein production. These data suggest that although ATM-specific mRNA is abundant in A-T cells, the abnormal ATM protein is unstable and is quickly targeted for degradation. We found little correlation between level of ATM protein and the type of underlying mutation, the clinical phenotype, or the radiophenotype.
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Affiliation(s)
- S G Becker-Catania
- Department of Pathology and Laboratory Medicine, UCLA School of Medicine, Los Angeles, California, 90095, USA
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11
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Abstract
Mutations at the ataxia-telangiectasia (A-T) locus on chromosome band 11q22 cause a distinctive autosomal recessive syndrome in homozygotes and predispose heterozygotes to cancer, ischemic heart disease, and early mortality. PCR amplification from genomic DNA and automated sequencing of the entire coding region (66 exons) and splice junctions detected 77 mutations (85%) in 90 A-T chromosomes. Heteroduplex analysis detected another 42 mutations at the A-T locus. Out of a total of 71 unique mutations, 50 were found only in a single family, and 51 had not been reported previously. Most (58/71, 82%) mutations were frameshift and nonsense mutations that are predicted to cause truncation of the A-T protein; the less common mutation types were missense (9/71, 13%), splicing (3/71, 4%) and one in-frame deletion, 2546 3 (1/71, 1%). The mean survival and height distribution of 134 A-T patients correlated significantly with the specific mutations present in the patients. Patients homozygous for a single truncating mutation, typically near the N-terminal end of the gene, or heterozygous for the in-frame deletion 2546 3, were shorter and had significantly shorter survival than those heterozygous for a splice site or missense mutation, or heterozygous for two truncating mutations. Alterations of the length or amino acid composition of the A-T gene product affect the A-T clinical phenotype in different ways. Mutation analysis at the A-T locus may help estimate the prognosis of A-T patients.
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Affiliation(s)
- A Li
- Institute for the Genetic Analysis of Common Diseases, New York Medical College, Hawthorne 10532, USA
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12
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Seidemann K, Henze G, Beck JD, Sauerbrey A, Kühl J, Mann G, Reiter A. Non-Hodgkin's lymphoma in pediatric patients with chromosomal breakage syndromes (AT and NBS): experience from the BFM trials. Ann Oncol 2000; 11 Suppl 1:141-5. [PMID: 10707797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023] Open
Abstract
BACKGROUND Lymphoma and leukemia are the commonest malignant diseases in patients with chromosomal breakage syndromes and immunodeficiency (Ataxia teleangiectasia (AT) and Nijmegen breakage syndrome (NBS)). With improved management of infections, malignant disease is more frequently diagnosed and has become one of the commonest causes of death in pediatric AT and NBS. PATIENTS AND METHODS In three consecutive multicenter therapy trials for pediatric non-Hodgkin's lymphoma (NHL) (NHL-BFM), 1569 patients with newly diagnosed NHL have been registered between 1986 and 1997. Nine patients with AT (n = 5) and NBS (n = 4) were identified and analysed. RESULTS Median age of patients with AT and NBS at diagnosis of NHL was nine years. NHL-entities differed from non-AT/NBS-patients: diffuse large B-cell lymphomas, n = 7 (78%); ALCL, n = 1; lymphoblastic T-cell lymphoma, n = 1. Cervical nodes, paranasal sinuses and epipharynx were the sites most frequently involved. Stages were: I and II in three patients, III in five and IV in one patient. All patients received polychemotherapy according to tumor-entity and stage, none received radiation. Dose reductions according to individual tolerance concerned mainly ethotrexate, alkylating agents and epipodophyllotoxines. One patient died of toxic complications, two patients relapsed and died, one patient suffered from second malignancy. Five of nine patients are in 1. CCR after a median follow-up of five years. CONCLUSIONS Patients with AT and NBS suffer from rare entities of pediatric NHL. Curative treatment is possible and should be attempted. Intensity of therapy should be adjusted to individual risk factors and tolerance. Alkylating agents, epipodophyllotoxines should be omitted, dose of MTX should be limited to 1 g/m2. Further cooperative trials using standardized approaches are required.
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Affiliation(s)
- K Seidemann
- University Children's Hospitals of Hannover, Germany
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13
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Abstract
Mortality from cancer among 178 parents and 236 grandparents of 95 British patients with ataxia-telangiectasia was examined. For neither parents nor grandparents was mortality from all causes or from cancer appreciably elevated over that of the national population. Among mothers, three deaths from breast cancer gave rise to a standardized mortality ratio of 3.37 (95% confidence interval (CI): 0.69-9.84). In contrast, there was no excess of breast cancer in grandmothers, the standardized mortality ratio being 0.89 (95% CI: 0.18-2.59), based on three deaths. This is the largest study of families of ataxia-telangiectasia patients conducted in Britain but, nonetheless, the study is small and CIs are wide. However, taken together with data from other countries, an increased risk of breast cancer among female heterozygotes is still apparent, though lower than previously thought.
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Affiliation(s)
- H M Inskip
- MRC Environmental Epidemiology Unit, University of Southampton, Southampton General Hospital, UK
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14
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Pippard EC, Hall AJ, Barker DJ, Bridges BA. Cancer in homozygotes and heterozygotes of ataxia-telangiectasia and xeroderma pigmentosum in Britain. Cancer Res 1988; 48:2929-32. [PMID: 3359449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
We have documented mortality and cancer incidence in the families of 67 patients with ataxia-telangiectasia and 48 patients with xeroderma pigmentosum resident in Britain. For both diseases, parents of patients are obligate heterozygotes and grandparents have a probability of heterozygosity of 0.5. Fourteen ataxia-telangiectasia patients had died by June 30, 1986. This was a significant excess (14 deaths observed, 1.65 expected). Only one death was from a malignancy (non-Hodgkin's lymphoma). Three parents of ataxia-telangiectasia patients had died, all from cancer. The excess from breast cancer (two deaths observed, 0.17 expected) was statistically significant, p less than 0.05. However, no excess mortality from malignant neoplasms was found in the grandparents. Five xeroderma pigmentosum patients had died, none from internal malignancies. No excess mortality from malignant neoplasms was recorded in either their parents or grandparents.
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Affiliation(s)
- E C Pippard
- MRC Environmental Epidemiology Unit, University of Southampton, Southampton General Hospital, England
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Tsukahara M, Masuda M, Ohshiro K, Kobayashi K, Kajii T, Ejima Y, Sasaki MS. Ataxia telangiectasia with generalized skin pigmentation and early death. Eur J Pediatr 1986; 145:121-4. [PMID: 3732314 DOI: 10.1007/bf00441871] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A female infant with clinical and laboratory features of ataxia telangiectasia (AT) showed two clinical features exceptional for the disease, i.e. generalized skin pigmentation and an unusually early death at the age of 15 months. Her clinical features supportive of the diagnosis of AT included growth and developmental retardation and muscle weakness. Findings indicating immunodeficiency included recurrent pulmonary infections, failure of PHA stimulation of PB lymphocytes, decreased levels of serum IgM and IgA and on autopsy, an atrophic thymus without Hassall's corpuscles. Her cultured skin fibroblasts showed increased spontaneous chromosome breakages and hypersensitivity to X-ray irradiation, as would be expected for AT fibroblasts. She showed elevated blood HbF levels, macrocytic anaemia, granulocytopenia and thrombocytopenia, findings suggestive of a preleukaemic or leukaemic process. Yet aspirates of her bone marrow revealed no malignant cells. Autopsy revealed bilateral Pneumocystis carinii pneumonia, telangiectatic lesions in all the internal organs studied, sparse and degenerative Purkinje cells in the cerebellar cortex and atrophic ovaries. In view of these findings, it was concluded that the patient had a hitherto undescribed variant of ataxia telangiectasia.
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