1
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Cines DB. Pathogenesis of refractory ITP: Overview. Br J Haematol 2023; 203:10-16. [PMID: 37735546 PMCID: PMC10539016 DOI: 10.1111/bjh.19083] [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: 03/02/2023] [Revised: 06/09/2023] [Accepted: 07/31/2023] [Indexed: 09/23/2023]
Abstract
A subset of individuals with 'primary' or 'idiopathic' immune thrombocytopenia (ITP) who fail to respond to conventional first- and second-line agents or who lose responsiveness are considered to have 'refractory' disease (rITP), placing them at increased risk of bleeding and complications of intensive treatment. However, the criteria used to define the refractory state vary among studies, which complicates research and clinical investigation. Moreover, it is unclear whether rITP is simply 'more severe' ITP, or if there are specific pathogenic pathways that are more likely to result in refractory disease, and whether the presence or development of rITP can be established or anticipated based on these differences. This paper reviews potential biological features that may be associated with rITP, including genetic and epigenetic risk factors, dysregulation of T cells and cytokine networks, antibody affinity and specificity, activation of complement, impaired platelet production and alterations in platelet viability and clearance. These findings indicate the need for longitudinal studies using novel clinically available methodologies to identify and monitor pathogenic T cells, platelet antibodies and other clues to the development of refractory disease.
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Affiliation(s)
- Douglas B Cines
- Department of Pathology and Laboratory Medicine, Perelman-University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA
- Department of Medicine, Perelman-University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA
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2
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Schifferli A, Le Gavrian G, Aladjidi N, Moulis G, Godeau B, Kühne T. Chronic refractory immune thrombocytopenia in adolescents and young adults. Br J Haematol 2023; 203:36-42. [PMID: 37735549 DOI: 10.1111/bjh.19081] [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: 05/28/2023] [Accepted: 07/31/2023] [Indexed: 09/23/2023]
Abstract
Defining immune thrombocytopenia (ITP) in two age groups-children and adults-overlooks the specific clinical features and needs of adolescents and young adults (AYAS). We previously reported a high risk of chronic disease at 12 months (50%); however, data on the course of chronic ITP, the risk of refractoriness and treatment strategies in AYAS are limited. Data from patients aged 12-25 years with chronic primary ITP at 12 months were extracted from three large registries between 2004 and 2021. Clinical and laboratory data were evaluated until 48 months of follow-up (FU). Refractory ITP was defined as the administration of ≥3 different lines of therapy. A total of 427 AYAS (64% female) with chronic ITP were included. Overall, 7% and 14% were classified as 'refractory' at 12 and 48 months of FU respectively. The proportion of males was greater in the refractory group than in the non-refractory group (43% vs. 35%). AYAS with refractory disease displayed lower median platelet counts, more bleeding and a higher need for treatment at initial diagnosis and FU than non-refractory patients. This study reveals that refractory ITP is uncommon in AYAS; however, AYAS with refractory ITP display a high disease burden at all time points, including at initial diagnosis.
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Affiliation(s)
- Alexandra Schifferli
- Department of Hematology/Oncology, University Children's Hospital Basel, Basel, Switzerland
| | - Gautier Le Gavrian
- Department of Hematology/Oncology, University Children's Hospital Basel, Basel, Switzerland
| | - Nathalie Aladjidi
- Centre de Référence National des Cytopénies Autoimmunes de l'Enfant (CEREVANCE), Pediatric Hematologic Unit, Centre d'Investigation Clinique Plurithématique (CICP) INSERM 1401, University Hospital of Bordeaux, Bordeaux, France
| | - Guillaume Moulis
- Service de Médecine Interne, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
- Centre d'Investigation Clinique 1436, Équipe PEPSS, Centre Hospitalier Universitaire de Toulouse, Toulouse, France
| | - Bertrand Godeau
- Department of Internal Medicine, National Reference Center for Adult Immune Cytopenias, Henri Mondor University Hospital, Assistance Publique Hopitaux de Paris, Université Paris-Est Créteil, Créteil, France
| | - Thomas Kühne
- Department of Hematology/Oncology, University Children's Hospital Basel, Basel, Switzerland
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3
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Liu XG, Hou Y, Hou M. How we treat primary immune thrombocytopenia in adults. J Hematol Oncol 2023; 16:4. [PMID: 36658588 PMCID: PMC9850343 DOI: 10.1186/s13045-023-01401-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2022] [Accepted: 01/11/2023] [Indexed: 01/20/2023] Open
Abstract
Primary immune thrombocytopenia (ITP) is an immune-mediated bleeding disorder characterized by decreased platelet counts and an increased risk of bleeding. Multiple humoral and cellular immune abnormalities result in accelerated platelet destruction and suppressed platelet production in ITP. The diagnosis remains a clinical exclusion of other causes of thrombocytopenia. Treatment is not required except for patients with active bleeding, severe thrombocytopenia, or cases in need of invasive procedures. Corticosteroids, intravenous immunoglobulin, and anti-RhD immunoglobulin are the classical initial treatments for newly diagnosed ITP in adults, but these agents generally cannot induce a long-term response in most patients. Subsequent treatments for patients who fail the initial therapy include thrombopoietic agents, rituximab, fostamatinib, splenectomy, and several older immunosuppressive agents. Other potential therapeutic agents, such as inhibitors of Bruton's tyrosine kinase and neonatal Fc receptor, are currently under clinical evaluation. An optimized treatment strategy should aim at elevating the platelet counts to a safety level with minimal toxicity and improving patient health-related quality of life, and always needs to be tailored to the patients and disease phases. In this review, we address the concepts of adult ITP diagnosis and management and provide a comprehensive overview of current therapeutic strategies under general and specific situations.
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Affiliation(s)
- Xin-Guang Liu
- Department of Hematology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Yu Hou
- Department of Hematology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China
| | - Ming Hou
- Department of Hematology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China. .,Shandong Provincial Key Laboratory of Immunohematology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, China.
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4
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Goda S, Hayakawa S, Karakawa S, Okada S, Kawaguchi H, Kobayashi M. Possible involvement of regulatory T cell abnormalities and variational usage of TCR repertoire in children with autoimmune neutropenia. Clin Exp Immunol 2020; 204:1-13. [PMID: 33289074 DOI: 10.1111/cei.13559] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 11/21/2020] [Accepted: 11/23/2020] [Indexed: 01/16/2023] Open
Abstract
Autoimmune neutropenia (AIN) in childhood is characterized by chronic neutropenia and positivity for anti-neutrophil antibodies, resulting in the excessive destruction of neutrophils. In this study, we investigated the involvement of regulatory T cells (Tregs ) in the pathogenesis of AIN in childhood. Tregs have been classified into three subpopulations based on the expressions of CD45RA and forkhead box protein 3 (FoxP3): resting Tregs , activated Tregs and non-suppressive Tregs . The frequency of activated Tregs (CD4+ CD25+ FoxP3high CD45RA- T cells) as well as that of total Tregs (CD4+ CD25+ FoxP3+ T cells) in peripheral blood was significantly decreased in patients with AIN. Analysis of the T cell receptor (TCR)-Vβ repertoire of CD4+ T cells revealed skewed usages in patients with AIN compared with that observed in age-matched control subjects. Regarding T cell subsets, the use of four of 24 TCR-Vβ families in Tregs and one in conventional T cells were increased in patients with AIN. The number of patients with AIN who showed skewed usages of TCR-Vβ family in conventional and Tregs was significantly higher than that reported in control subjects. When the preference between Tregs and conventional T cells in each TCR-Vβ family was individually compared, different use was prominently observed in the TCR-Vβ 9 family in patients with AIN. These results suggest that the quantitative abnormalities of Tregs and the skew of the TCR-Vβ repertoire in CD4+ T cells, including Tregs and conventional T cells, may be related to autoantibody production through a human neutrophil antigen-reactive T cell clone.
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Affiliation(s)
- S Goda
- Department of Pediatrics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - S Hayakawa
- Department of Pediatrics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - S Karakawa
- Department of Pediatrics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - S Okada
- Department of Pediatrics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - H Kawaguchi
- Department of Pediatrics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
| | - M Kobayashi
- Department of Pediatrics, Hiroshima University Graduate School of Biomedical and Health Sciences, Hiroshima, Japan
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Mahévas M, Audia S, Viallard JF. [Management of multirefractory immune thrombocytopenia]. Rev Med Interne 2020; 42:46-49. [PMID: 33334631 DOI: 10.1016/j.revmed.2020.10.378] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 09/21/2020] [Accepted: 10/20/2020] [Indexed: 10/22/2022]
Abstract
Multirefractory immune thrombocytopenia (ITP) is defined by the absence of response to TPO receptor agonists, rituximab and splenectomy (or contraindicated or refused) and the need of treatment. The approach to multirefractory ITP must be systematic and firstly involves reconsidering the diagnosis. Inherited thrombocytopenia, lymphoid hemopathies and myelodysplastic syndrome are the main causes to be mentioned. Multirefractory ITP is often associated with secondary ITP with signs of clinical or biological autoimmunity, monoclonal gammopathy of undetermined significance and a poor response to corticosteroids. Therapeutic management is complex and is based on the combination of treatments. New treatments are being developed.
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Affiliation(s)
- M Mahévas
- Service de médecine interne, centre de référence des cytopénies auto-immunes de l'adulte, centre hospitalier universitaire Henri-Mondor, Assistance Publique-Hôpitaux de Paris, université Paris-Est-Créteil, Créteil, France.
| | - S Audia
- Service de médecine interne et immunologie clinique, médecine 1-SOC 1, hôpital François-Mitterrand, 14, rue Paul-Gaffarel, centre de référence des cytopénies auto-immunes de l'adulte, CHU de Dijon-Bourgogne, 21079 Dijon cedex, France
| | - J-F Viallard
- Service de médecine interne et maladies infectieuses, hôpital Haut-Lévêque, université de Bordeaux, 5, avenue de Magellan, 33604 Pessac cedex, France
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6
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Miltiadous O, Hou M, Bussel JB. Identifying and treating refractory ITP: difficulty in diagnosis and role of combination treatment. Blood 2020; 135:472-490. [PMID: 31756253 PMCID: PMC7484752 DOI: 10.1182/blood.2019003599] [Citation(s) in RCA: 92] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 11/08/2019] [Indexed: 01/19/2023] Open
Abstract
Immune thrombocytopenia (ITP) is the most common acquired thrombocytopenia after chemotherapy-induced thrombocytopenia. Existing guidelines describe the management and treatment of most patients who, overall, do well, even if they present with chronic disease, and they are usually not at a high risk for bleeding; however, a small percentage of patients is refractory and difficult to manage. Patients classified as refractory have a diagnosis that is not really ITP or have disease that is difficult to manage. ITP is a diagnosis of exclusion; no specific tests exist to confirm the diagnosis. Response to treatment is the only affirmative confirmation of diagnosis. However, refractory patients do not respond to front-line or other treatments; thus, no confirmation of diagnosis exists. The first section of this review carefully evaluates the diagnostic considerations in patients with refractory ITP. The second section describes combination treatment for refractory cases of ITP. The reported combinations are divided into the era before thrombopoietin (TPO) and rituximab and the current era. Current therapy appears to have increased effectiveness. However, the definition of refractory, if it includes insufficient response to TPO agents, describes a group with more severe and difficult-to-treat disease. The biology of refractory ITP is largely unexplored and includes oligoclonality, lymphocyte pumps, and other possibilities. Newer treatments, especially rapamycin, fostamatinib, FcRn, and BTK inhibitors, may be useful components of future therapy given their mechanisms of action; however, TPO agents, notwithstanding failure as monotherapy, appear to be critical components. In summary, refractory ITP is a complicated entity in which a precise specific diagnosis is as important as the development of effective combination treatments.
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Affiliation(s)
- Oriana Miltiadous
- Division of Hematology/Oncology, Department of Pediatrics, Weill Cornell Medicine, New York, NY
- Department of Pediatrics, Memorial Sloan Kettering Cancer Center, New York, NY; and
| | - Ming Hou
- Department of Hematology, Qilu Hospital, Shandong University, Jinan, China
| | - James B Bussel
- Division of Hematology/Oncology, Department of Pediatrics, Weill Cornell Medicine, New York, NY
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7
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Zhang H, Zhang BM, Guo X, Xu L, You X, West RB, Bussel JB, Zehnder JL. Blood transcriptome and clonal T-cell correlates of response and non-response to eltrombopag therapy in a cohort of patients with chronic immune thrombocytopenia. Haematologica 2019; 105:e129-e132. [PMID: 31296576 DOI: 10.3324/haematol.2019.226688] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Affiliation(s)
- Haiyu Zhang
- Department of Pathology, School of Medicine, Stanford University, Stanford, CA, USA
| | - Bing M Zhang
- Department of Pathology, School of Medicine, Stanford University, Stanford, CA, USA
| | - Xiangqian Guo
- Department of Pathology, School of Medicine, Stanford University, Stanford, CA, USA.,Department of Preventive Medicine, School of Basic Medical Sciences, Henan University, Kaifeng, China
| | - Liwen Xu
- Department of Pathology, School of Medicine, Stanford University, Stanford, CA, USA
| | - Xiaoqing You
- Department of Pathology, School of Medicine, Stanford University, Stanford, CA, USA
| | - Robert B West
- Department of Pathology, School of Medicine, Stanford University, Stanford, CA, USA
| | - James B Bussel
- Platelet Disorders Center, Department of Pediatrics, Weill-Cornell Medicine, New York, NY, USA
| | - James L Zehnder
- Department of Pathology, School of Medicine, Stanford University, Stanford, CA, USA
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8
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Agnelli Giacchello J, Valeri F, Boccadoro M, Borchiellini A. Thrombopoietin receptor agonists in patients with persistent or chronic immune thrombocytopenia. Eur J Haematol 2018; 100:304-307. [DOI: 10.1111/ejh.13014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/28/2017] [Indexed: 12/17/2022]
Affiliation(s)
- Jacopo Agnelli Giacchello
- Regional Center for Hemorrhagic and Thrombotic Diseases; Haematology Unit; City of Health and Science University Hospital of Molinette; Turin Italy
| | - Federica Valeri
- Regional Center for Hemorrhagic and Thrombotic Diseases; Haematology Unit; City of Health and Science University Hospital of Molinette; Turin Italy
| | - Mario Boccadoro
- Regional Center for Hemorrhagic and Thrombotic Diseases; Haematology Unit; City of Health and Science University Hospital of Molinette; Turin Italy
| | - Alessandra Borchiellini
- Regional Center for Hemorrhagic and Thrombotic Diseases; Haematology Unit; City of Health and Science University Hospital of Molinette; Turin Italy
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9
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Audia S, Mahévas M, Samson M, Godeau B, Bonnotte B. Pathogenesis of immune thrombocytopenia. Autoimmun Rev 2017; 16:620-632. [DOI: 10.1016/j.autrev.2017.04.012] [Citation(s) in RCA: 126] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2017] [Accepted: 03/17/2017] [Indexed: 01/19/2023]
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10
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Liu X, Hou Y, Peng J. Advances in immunopathogenesis of adult immune thrombocytopenia. Front Med 2013; 7:418-24. [DOI: 10.1007/s11684-013-0297-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Accepted: 09/25/2013] [Indexed: 10/26/2022]
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11
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Zhang X, Chen S, Yang L, Li B, Zhu K, Li Y. The feature of TRGV and TRDV repertoire distribution and clonality in patients with immune thrombocytopenic purpura. Hematology 2013; 14:237-44. [PMID: 19635188 DOI: 10.1179/102453309x439755] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Xueli Zhang
- Department of HematologyFirst Affiliated Hospital, Jinan University, Guangzhou, 510632, China
| | - Shaohua Chen
- Institute of HematologyMedical College, Jinan University, Guangzhou, 510632, China
| | - Lijian Yang
- Institute of HematologyMedical College, Jinan University, Guangzhou, 510632, China
| | - Bo Li
- Institute of HematologyMedical College, Jinan University, Guangzhou, 510632, China
| | - Kanger Zhu
- Department of HematologyFirst Affiliated Hospital, Jinan University, Guangzhou, 510632, China
| | - Yangqiu Li
- Department of HematologyFirst Affiliated Hospital, Jinan University, Guangzhou, 510632, China; Key Laboratory for Regenerative Medicine of Ministry of Education, Jinan University, Guangzhou, 510632, China
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12
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Abstract
B lymphocytes producing antiplatelet autoantibodies play a major role in autoimmune thrombocytopenia (ITP). However, certain B cells, including the human CD19(+)CD24(hi)CD38(hi) subpopulation, possess regulatory functions mediated partly by IL-10. In a cohort of chronic ITP patients with low platelet counts who consisted of patients off treatment, we found a lower frequency of CD19(+)CD24(hi)CD38(hi) in the peripheral compartment of nonsplenectomized patients (P = .03). IL-10 expression after activation was decreased in all ITP circulating CD19(+) subpopulations (P < .03), and inhibition of monocyte TNF-α expression by activated B cells was reduced in patients with platelet numbers of < 50 × 10(9) cells/L (P = .001), indicating that regulatory B cells of patients with ITP are functionally impaired in their ability to dampen monocyte activation. Interestingly, in nonsplenectomized patients whose platelet counts were elevated after treatment with thrombopoietic agents, the frequency of CD19(+)CD24(hi)CD38(hi) B cells was increased compared with those before treatment (P = .02). Altogether, these data indicate a compromised regulatory B-cell compartment as an additional defect in immune regulation in patients with chronic ITP that may be restored in responders to thrombopoietic treatment.
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13
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Stasi R. Pathophysiology and therapeutic options in primary immune thrombocytopenia. BLOOD TRANSFUSION = TRASFUSIONE DEL SANGUE 2011; 9:262-73. [PMID: 21251458 PMCID: PMC3136592 DOI: 10.2450/2010.0080-10] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/12/2010] [Accepted: 10/11/2010] [Indexed: 01/11/2023]
Affiliation(s)
- Roberto Stasi
- Department of Haematology, St George's Hospital, Blackshaw Road, London, United Kingdom.
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14
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Affiliation(s)
- Roberto Stasi
- Department of Haematology, St George’s Hospital, London
| | - Adrian C. Newland
- Department of Haematology, Barts and the London NHS Trust, London, UK
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15
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Wang T, Wang Z, Yang R. Thrombopoietic growth factors in the treatment of immune thrombocytopenic purpura. Crit Rev Oncol Hematol 2011; 77:172-83. [DOI: 10.1016/j.critrevonc.2010.03.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2009] [Revised: 02/25/2010] [Accepted: 03/10/2010] [Indexed: 10/19/2022] Open
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ZHANG X, LI Y, CHEN S, YANG L, CHEN S, WU X, ZHANG T, ZHONG J, ZHU K. The feature of clonal expansion of TCR Vβ repertoire, thymic recent output function and TCRζ chain expression in patients with immune thrombocytopenic purpura. Int J Lab Hematol 2009; 31:639-48. [DOI: 10.1111/j.1751-553x.2008.01091.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Immune thrombocytopenia (ITP) is mediated by platelet autoantibodies that accelerate platelet destruction and inhibit their production. Most cases are considered idiopathic, whereas others are secondary to coexisting conditions. Insights from secondary forms suggest that the proclivity to develop platelet-reactive antibodies arises through diverse mechanisms. Variability in natural history and response to therapy suggests that primary ITP is also heterogeneous. Certain cases may be secondary to persistent, sometimes inapparent, infections, accompanied by coexisting antibodies that influence outcome. Alternatively, underlying immune deficiencies may emerge. In addition, environmental and genetic factors may impact platelet turnover, propensity to bleed, and response to ITP-directed therapy. We review the pathophysiology of several common secondary forms of ITP. We suggest that primary ITP is also best thought of as an autoimmune syndrome. Better understanding of pathogenesis and tolerance checkpoint defects leading to autoantibody formation may facilitate patient-specific approaches to diagnosis and management.
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Effects of eradication of Helicobacter pylori infection in patients with immune thrombocytopenic purpura: a systematic review. Blood 2009; 113:1231-40. [DOI: 10.1182/blood-2008-07-167155] [Citation(s) in RCA: 223] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
AbstractWhether the eradication of Helicobacter pylori infection can increase the platelet count in patients with immune thrombocytopenic purpura (ITP) is still a controversial issue. To provide evidence-based guidance, we performed a systematic review of the literature published in English, selecting articles reporting 15 or more total patients. We identified 25 studies including 1555 patients, of whom 696 were evaluable for the effects of H pylori eradication on platelet count. The weighted mean complete response (platelet count ≥ 100 × 109/L) and overall response (platelet count ≥ 30 × 109/L and at least doubling of the basal count) were 42.7% (95% confidence interval [CI], 31.8%-53.9%) and 50.3% (95% CI, 41.6%-59.0%), respectively. In 222 patients with a baseline platelet count less than 30 × 109/L, the complete response rate was 20.1% (95% CI, 13.5%-26.7%) and the overall response rate was 35.2% (95% CI, 28.0%-42.4%). The response rate tended to be higher in countries with a high background prevalence of H pylori infection and in patients with milder degrees of thrombocytopenia. These findings suggest that the detection and eradication of H pylori infection should be considered in the work-up of patients with seemingly typical ITP.
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Analysis of regulatory T-cell changes in patients with idiopathic thrombocytopenic purpura receiving B cell-depleting therapy with rituximab. Blood 2008; 112:1147-50. [PMID: 18375792 DOI: 10.1182/blood-2007-12-129262] [Citation(s) in RCA: 294] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The effects of B-cell depletion with rituximab on regulatory T cells (Tregs) have not been determined. We investigated Tregs in patients receiving rituximab for chronic idiopathic thrombocytopenic purpura (ITP). The peripheral blood Tregs, identified as CD4+FOXP3+ T cells, were measured by flow cytometry prior to and after the immunotherapy. In addition, Tregs were analyzed for their usage of the T-cell receptor (TCR) beta-variable (VB) region gene as well as their regulatory function as assessed by cell proliferation assays. Pretreatment data revealed a reduced number and a defective suppressive capacity of Tregs in ITP patients compared with control individuals. In addition, Tregs showed a polyclonal spectratype. Patients, particularly responders, showed restored numbers of Tregs as well as a restored regulatory function upon treatment with rituximab. These results indicate that patients with active ITP have a defective T regulatory cell compartment that can be modulated by a B cell-targeted therapy.
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Stasi R, Del Poeta G, Stipa E, Evangelista ML, Trawinska MM, Cooper N, Amadori S. Response to B-cell depleting therapy with rituximab reverts the abnormalities of T-cell subsets in patients with idiopathic thrombocytopenic purpura. Blood 2007; 110:2924-30. [PMID: 17548576 DOI: 10.1182/blood-2007-02-068999] [Citation(s) in RCA: 225] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Rituximab, an anti-CD20 monoclonal antibody, has been used to treat autoimmune disorders such as idiopathic thrombocytopenic purpura (ITP). However, its mechanisms of action as well as the effects on cellular immunity remain poorly defined. We investigated the changes of different peripheral blood T-cell subsets, the apoptosis profile, as well as the changes of T-cell receptor (TCR) beta-variable (VB) region gene usage of CD4+ and CD8+ T-cell subpopulations following rituximab therapy. The study involved 30 patients with chronic ITP who received rituximab, of whom 14 achieved a durable (> 6 months) response. Compared with the control group, pretreatment abnormalities of T cells in ITP patients included an increase of the Th1/Th2 ratio and of the Tc1/Tc2 ratios (P < .001), increased expression of Fas ligand on Th1 and Th2 cells (P < .001), increased expression of Bcl-2 mRNA (P = .003) and decreased expression of bax mRNA (P = .025) in Th cells, and expansion of oligoclonal T cells with no preferential use of any TCR VB subfamily. These abnormalities were reverted in responders at 3 and 6 months after treatment, whereas they remained unchanged in nonresponders. Our findings indicate that in patients with ITP, response to B-cell depletion induced by rituximab is associated with significant changes of the T-cell compartment.
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MESH Headings
- Adult
- Aged
- Antibodies, Monoclonal/therapeutic use
- Antibodies, Monoclonal, Murine-Derived
- B-Lymphocytes/drug effects
- Fas Ligand Protein/biosynthesis
- Fas Ligand Protein/drug effects
- Female
- Flow Cytometry
- Gene Expression/drug effects
- Genes, T-Cell Receptor beta/drug effects
- Humans
- Immunologic Factors/therapeutic use
- Lymphocyte Depletion
- Male
- Middle Aged
- Proto-Oncogene Proteins c-bcl-2/biosynthesis
- Proto-Oncogene Proteins c-bcl-2/drug effects
- Purpura, Thrombocytopenic, Idiopathic/drug therapy
- Purpura, Thrombocytopenic, Idiopathic/immunology
- RNA, Messenger/analysis
- Rituximab
- T-Lymphocyte Subsets/drug effects
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
- T-Lymphocytes, Helper-Inducer/drug effects
- T-Lymphocytes, Helper-Inducer/immunology
- T-Lymphocytes, Helper-Inducer/metabolism
- bcl-2-Associated X Protein/biosynthesis
- bcl-2-Associated X Protein/drug effects
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Affiliation(s)
- Roberto Stasi
- Department of Medical Sciences, Ospedale Regina Apostolorum, Albano Laziale, Italy.
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