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Foret T, Dufrost V, Lagrange J, Costa P, Mourey G, Lecompte T, Magy-Bertrand N, Regnault V, Zuily S, Wahl D. Thrombin Generation Assay in Antiphospholipid Antibodies Positive Subjects as a Personalized Thrombotic Risk Assessment: State of the Art and Perspectives. Curr Rheumatol Rep 2024; 26:178-187. [PMID: 38372872 DOI: 10.1007/s11926-024-01140-1] [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] [Accepted: 02/05/2024] [Indexed: 02/20/2024]
Abstract
PURPOSE OF THE REVIEW Thrombotic risk assessment in antiphospholipid positive (aPL +) subjects is a major challenge, and the study of in vitro thrombin generation (thrombin generation assays (TGA)) could provide useful information. Activated protein C (APC) sensitivity is involved in thrombotic events in antiphospholipid syndrome patients. We summarized methods used to assess APC sensitivity with TGA and evaluated the prognostic role of APC resistance through literature search. RECENT FINDINGS APC resistance induced by aPL is a complex pathway. Several cross-sectional studies assessed APC sensitivity to understand thrombotic event mechanisms in aPL + subjects. Only one prospective cohort had investigated the prognostic impact of APC resistance in aPL + subjects, with a positive and significant correlation between APC sensitivity and the risk of thrombosis during the follow up (hazard ratio, 6.07 [95% CI, 1.69-21.87]). APC resistance assessed with TGA could be associated with thrombotic events in aPL + subjects.
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Affiliation(s)
- Thomas Foret
- Vascular Medicine Unit, Vascular and Endovascular Surgery Department, CHU-Besancon, 3 BD Alexandre Fleming, F-25000, Besancon, France.
- Université de Franche-Comté, SINERGIES, F-25000, Besancon, France.
| | - Virginie Dufrost
- Université de Lorraine, INSERM, DCAC, F-54000, Nancy, France
- Vascular Medicine Division and National Referral Center for Rare Vascular and Systemic Autoimmune Diseases, CHRU-Nancy, F-54000, Nancy, France
| | - Jeremy Lagrange
- Université de Lorraine, INSERM, DCAC, F-54000, Nancy, France
- CHRU-Nancy, F-54000, Nancy, France
| | - Patricia Costa
- Vascular Medicine Unit, Vascular and Endovascular Surgery Department, CHU-Besancon, 3 BD Alexandre Fleming, F-25000, Besancon, France
| | - Guillaume Mourey
- Université de Franche-Comté, SINERGIES, F-25000, Besancon, France
- Medical Biology Laboratory, Biological Haemostasis Department, CHU Besançon, F-25000, Besançon, France
| | - Thomas Lecompte
- Vascular Medicine Division and National Referral Center for Rare Vascular and Systemic Autoimmune Diseases, CHRU-Nancy, F-54000, Nancy, France
- Université de Lorraine, Nancy, France
| | | | - Veronique Regnault
- Université de Lorraine, INSERM, DCAC, F-54000, Nancy, France
- CHRU-Nancy, F-54000, Nancy, France
| | - Stéphane Zuily
- Université de Lorraine, INSERM, DCAC, F-54000, Nancy, France
- Vascular Medicine Division and National Referral Center for Rare Vascular and Systemic Autoimmune Diseases, CHRU-Nancy, F-54000, Nancy, France
| | - Denis Wahl
- Université de Lorraine, INSERM, DCAC, F-54000, Nancy, France
- Vascular Medicine Division and National Referral Center for Rare Vascular and Systemic Autoimmune Diseases, CHRU-Nancy, F-54000, Nancy, France
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Álvarez D, Rúa C, Cadavid J ÁP. Microparticles: An Alternative Explanation to the Behavior of Vascular Antiphospholipid Syndrome. Semin Thromb Hemost 2021; 47:787-799. [PMID: 33930895 DOI: 10.1055/s-0041-1727111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Antiphospholipid syndrome is an autoimmune disease characterized by the persistent presence of antiphospholipid antibodies, along with occurrence of vascular thrombosis and pregnancy morbidity. The variety of antiphospholipid antibodies and their related mechanisms, as well as the behavior of disease in wide groups of patients, have led some authors to propose a differentiation of this syndrome into two independent entities: vascular and obstetric antiphospholipid syndrome. Thus, previous studies have discussed whether specific autoantibodies may be responsible for this differentiation or, in contrast, how the same antibodies are able to generate two different clinical presentations. This discussion is yet to be settled. The capability of serum IgG from patients with vascular thrombosis to trigger the biogenesis of endothelial cell-derived microparticles in vitro is one of the previously discussed differences between the clinical entities of antiphospholipid syndrome. These vesicles constitute a prothrombotic mechanism as they can directly lead to clot activation in murine models and recalcified human plasma. Nevertheless, other indirect mechanisms by which microparticles can spread a procoagulant phenotype could be critical to understanding their role in antiphospholipid syndrome. For this reason, questions regarding the cargo of microparticles, and the signaling pathways involved in their biogenesis, are of interest in attempting to explain the behavior of this autoimmune disease.
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Affiliation(s)
- Daniel Álvarez
- Grupo Reproducción, Departamento Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia
| | - Carolina Rúa
- Grupo de Investigación en Trombosis, Departamento Medicina Interna, Facultad de Medicina, Universidad de Antioquia UdeA, Medellín, Colombia
| | - Ángela P Cadavid J
- Grupo Reproducción, Departamento Microbiología y Parasitología, Facultad de Medicina, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia.,Grupo de Investigación en Trombosis, Departamento Medicina Interna, Facultad de Medicina, Universidad de Antioquia UdeA, Medellín, Colombia
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Hermel M, Hermel D, Azam S, Shinbane J, Sarcon A, Jones E, Mehta A, Grazette L, Liebman H, Weitz I. Acute dilated cardiomyopathy in the setting of catastrophic antiphospholipid syndrome and thrombotic microangiopathy: A case series and review. EJHAEM 2020; 1:44-50. [PMID: 35847716 PMCID: PMC9175940 DOI: 10.1002/jha2.71] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 07/17/2020] [Accepted: 07/20/2020] [Indexed: 11/25/2022]
Abstract
Catastrophic antiphospholipid antibody syndrome (CAPS) is a rare form of antiphospholipid syndrome, an autoimmune condition characterized by vascular thromboses, pregnancy loss, and antiphospholipid (aPL) antibodies. Diagnosis of CAPS relies on thrombosis of at least three different organs systems over 1 week, histopathological evidence of small vessel occlusion, and high aPL antibody titers. In a subset of precipitating circumstances, activation or disruption of endothelial cells in the microvasculature may occur along with cardiomyopathy. We present two cases of CAPS-associated dilated cardiomyopathy at our institution, focusing on disease management, pathophysiology, and treatment. These patients were of Southeastern Asian descent, raising the possibility of genetic polymorphisms contributing to the development of cardiomyopathy. Both met CAPS criteria and both demonstrated clinicopathologic thrombotic microangiopathy (TMA) and complement activation and developed severe dilated cardiomyopathy with shock. Complement activation plays an important role in the development of CAPS and may be important in the pathogenesis of CAPS-associated cardiomyopathy. Clinical suspicion for TMA as a pathophysiologic mechanism of unexplained heart failure in CAPS is important and increased awareness of cardiac side effects is necessary so that early treatment can be initiated to halt further cardiac and systemic complications.
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Affiliation(s)
- Melody Hermel
- Department of MedicineKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCalifornia
| | - David Hermel
- Department of MedicineKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCalifornia
| | - Saif Azam
- Department of MedicineKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCalifornia
| | - Jerold Shinbane
- Department of CardiologyKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCalifornia
| | - Annahita Sarcon
- Department of CardiologyKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCalifornia
| | - Erika Jones
- Department of CardiologyKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCalifornia
| | - Arjun Mehta
- Department of PathologyKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCalifornia
| | - Luanda Grazette
- Department of CardiologyKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCalifornia
| | - Howard Liebman
- Jane Anne Nohl Division of HematologyKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCalifornia
| | - Ilene Weitz
- Jane Anne Nohl Division of HematologyKeck School of MedicineUniversity of Southern CaliforniaLos AngelesCalifornia
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4
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Chaturvedi S, Braunstein EM, Yuan X, Yu J, Alexander A, Chen H, Gavriilaki E, Alluri R, Streiff MB, Petri M, Crowther MA, McCrae KR, Brodsky RA. Complement activity and complement regulatory gene mutations are associated with thrombosis in APS and CAPS. Blood 2020; 135:239-251. [PMID: 31812994 PMCID: PMC6978159 DOI: 10.1182/blood.2019003863] [Citation(s) in RCA: 127] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 11/19/2019] [Indexed: 12/19/2022] Open
Abstract
The antiphospholipid syndrome (APS) is characterized by thrombosis and/or pregnancy morbidity in the presence of antiphospholipid antibodies, including anti-β2-glycoprotein-I (anti-β2GPI), that are considered central to APS pathogenesis. Based on animal studies showing a role of complement in APS-related clinical events, we used the modified Ham (mHam) assay (complement-dependent cell killing) and cell-surface deposition of C5b-9 to test the hypothesis that complement activation is associated with thrombotic events in APS. A positive mHam (and corresponding C5b-9 deposition) were present in 85.7% of catastrophic APS (CAPS), 35.6% of APS (and 68.5% of samples collected within 1 year of thrombosis), and only 6.8% of systemic lupus erythematosus (SLE) sera. A positive mHam assay was associated with triple positivity (for lupus anticoagulant, anticardiolipin, and anti-β2GPI antibodies) and recurrent thrombosis. Patient-derived anti-β2GPI antibodies also induced C5b-9 deposition, which was blocked completely by an anti-C5 monoclonal antibody, but not by a factor D inhibitor, indicating that complement activation by anti-β2GPI antibodies occurs primarily through the classical complement pathway. Finally, patients with CAPS have high rates of rare germline variants in complement regulatory genes (60%), compared with patients with APS (21.8%) or SLE (28.6%) or normal controls (23.3%), and have mutations at a rate similar to that of patients with atypical hemolytic uremic syndrome (51.5%). Taken together, our data suggest that anti-β2GPI antibodies activate complement and contribute to thrombosis in APS, whereas patients with CAPS have underlying mutations in complement regulatory genes that serve as a "second hit," leading to uncontrolled complement activation and a more severe thrombotic phenotype.
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Affiliation(s)
- Shruti Chaturvedi
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Evan M Braunstein
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Xuan Yuan
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Jia Yu
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Alice Alexander
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Hang Chen
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Eleni Gavriilaki
- Department of Hematology, Papanicolaou Hospital, Thessaloniki, Greece
| | - Ravi Alluri
- Division of Hematology and Medical Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH
| | - Michael B Streiff
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Michelle Petri
- Division of Rheumatology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD; and
| | - Mark A Crowther
- Department of Pathology and Molecular Medicine, Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada
| | - Keith R McCrae
- Division of Hematology and Medical Oncology, Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH
| | - Robert A Brodsky
- Division of Hematology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
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Meroni PL, Borghi MO. Diagnostic laboratory tests for systemic autoimmune rheumatic diseases: unmet needs towards harmonization. Clin Chem Lab Med 2019; 56:1743-1748. [PMID: 29708880 DOI: 10.1515/cclm-2018-0066] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Accepted: 02/28/2018] [Indexed: 12/11/2022]
Abstract
Abstract
Autoantibodies are helpful tools not only for the diagnosis and the classification of systemic autoimmune rheumatic diseases (SARD) but also for sub-grouping patients and/or for monitoring disease activity or specific tissue/organ damage. Consequently, the role of the diagnostic laboratory in the management of SARD is becoming more and more important. The advent of new techniques raised the need of updating and harmonizing our use/interpretation of the assays. We discuss in this opinion paper some of these issues. Indirect immunofluorescence (IIF) was originally suggested as the reference technique for anti-nuclear antibody (ANA) detection as previous solid phase assays (SPA) displayed lower sensitivity. The new available SPA are now offering better results and can represent alternative or even complementary diagnostic tools for ANA detection. The improved sensitivity of SPA technology is also changing our interpretation of the results for other types of autoantibody assays, but we need updating their calibration and new reference materials are going to be obtained in order to harmonize the assays. There is growing evidence that the identification of autoantibody combinations or profiles is helpful in improving diagnosis, patients’ subgrouping and predictivity for disease evolution in the field of SARD. We report some explanatory examples to support the idea to make the use of these autoantibody profiles more and more popular. The technological evolution of the autoimmune assays is going to change our routine diagnostic laboratory tests for SARD and validation of new algorithms is needed in order to harmonize our approach to the issue.
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Affiliation(s)
- Pier Luigi Meroni
- Experimental Laboratory of Immunological and Rheumatologic Researches, IRCCS Istituto Auxologico Italiano, Via Zucchi 18, 20095 Cusano Milanino, Milan, Italy
| | - Maria Orietta Borghi
- Experimental Laboratory of Immunological and Rheumatologic Researches, IRCCS Istituto Auxologico Italiano, Via Zucchi 18, 20095 Cusano Milanino, Milan, Italy.,Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
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6
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Han X, Wang W, He J, Jiang L, Li X. Osteopontin as a biomarker for osteosarcoma therapy and prognosis. Oncol Lett 2019; 17:2592-2598. [PMID: 30854034 PMCID: PMC6365895 DOI: 10.3892/ol.2019.9905] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Accepted: 11/16/2018] [Indexed: 12/13/2022] Open
Abstract
Osteosarcoma (OS) is the most common bone malignancy, and is particularly prevalent in children and adolescents. OS is an aggressive tumor with a tendency to metastasize and invade to para-carcinoma tissues. The primary treatment for this tumor is a combination of surgery and chemotherapy. However, the prognosis remains poor due to chemoresistance and early metastasis. Osteopontin (OPN), a multifunctional secreted protein, has emerged as an important potential biomarker for diagnosing and treating cancer. The overexpression of OPN has been found in numerous malignant tumors, including breast, lung, gastric and ovarian cancer, as well as melanoma. Recent studies have suggested that OPN may provide an important function in the diagnosis and treatment of OS. The present review summarizes current knowledge and progress in understanding the potential role of OPN as a biomarker in OS.
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Affiliation(s)
- Xingwen Han
- Department of Orthopedics, First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Wenji Wang
- Department of Orthopedics, First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Jingjing He
- Department of Liver Diseases, Second Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Lei Jiang
- Department of Oncology Surgery, First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
| | - Xun Li
- Department of General Surgery, First Hospital of Lanzhou University, Lanzhou, Gansu 730000, P.R. China
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7
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Durigutto P, Grossi C, Borghi MO, Macor P, Pregnolato F, Raschi E, Myers MP, de Groot PG, Meroni PL, Tedesco F. New insight into antiphospholipid syndrome: antibodies to β2glycoprotein I-domain 5 fail to induce thrombi in rats. Haematologica 2018; 104:819-826. [PMID: 30442725 PMCID: PMC6442945 DOI: 10.3324/haematol.2018.198119] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 11/14/2018] [Indexed: 11/09/2022] Open
Abstract
Clinical studies have reported different diagnostic/predictive values of antibodies to domain 1 or 4/5 of β2glycoproteinI in terms of risk of thrombosis and pregnancy complications in patients with antiphospholipid syndrome. To obtain direct evidence for the pathogenic role of anti-domain 1 or anti-domain 4/5 antibodies, we analyzed the in vivo pro-coagulant effect of two groups of 5 sera IgG each reacting selectively with domain 1 or domain 5 in lipopolysaccharide (LPS)-treated rats. Antibody-induced thrombus formation in mesenteric vessels was followed by intravital microscopy, and vascular deposition of β2glycoproteinI, human IgG and C3 was analyzed by immunofluorescence. Five serum IgG with undetectable anti-β2glycoproteinI antibodies served as controls. All the anti-domain 1-positive IgG exhibited potent pro-coagulant activity while the anti-domain 5-positive and the negative control IgG failed to promote blood clot and vessel occlusion. A stronger granular deposit of IgG/C3 was found on the mesenteric endothelium of rats treated with anti-domain 1 antibodies, as opposed to a mild linear IgG staining and absence of C3 observed in rats receiving anti-domain 5 antibodies. Purified anti-domain 5 IgG, unlike anti-domain 1 IgG, did not recognize cardiolipin-bound β2glycoproteinI while being able to interact with fluid-phase β2glycoproteinI. These findings may explain the failure of anti-domain 5 antibodies to exhibit a thrombogenic effect in vivo, and the interaction of these antibodies with circulating β2glycoproteinI suggests their potential competitive role with the pro-coagulant activity of anti-domain 1 antibodies. These data aim at better defining “really at risk” patients for more appropriate treatments to avoid recurrences and disability.
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Affiliation(s)
| | - Claudia Grossi
- Istituto Auxologico Italiano, IRCCS, Laboratory of Immuno-Rheumatology, Milan, Italy
| | - Maria Orietta Borghi
- Istituto Auxologico Italiano, IRCCS, Laboratory of Immuno-Rheumatology, Milan, Italy.,Department of Clinical Sciences and Community Health, University of Milan, Italy
| | - Paolo Macor
- Department of Life Sciences, University of Trieste, Italy
| | - Francesca Pregnolato
- Istituto Auxologico Italiano, IRCCS, Laboratory of Immuno-Rheumatology, Milan, Italy
| | - Elena Raschi
- Istituto Auxologico Italiano, IRCCS, Laboratory of Immuno-Rheumatology, Milan, Italy
| | - Michael P Myers
- International Centre for Genetic Engineering and Biotechnology, Trieste, Italy
| | - Philip G de Groot
- Department of Clinical Chemistry and Haematology, University of Utrecht, University Medical Center Utrecht, the Netherlands
| | - Pier Luigi Meroni
- Istituto Auxologico Italiano, IRCCS, Laboratory of Immuno-Rheumatology, Milan, Italy
| | - Francesco Tedesco
- Istituto Auxologico Italiano, IRCCS, Laboratory of Immuno-Rheumatology, Milan, Italy
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Antiphospholipid antibody profile-based outcome of purely vascular and purely obstetric antiphospholipid syndrome. J Thromb Thrombolysis 2018; 46:166-173. [DOI: 10.1007/s11239-018-1672-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Üsküdar Cansu D, Üsküdar Teke H, Musmul A, Korkmaz C. Is thrombocytosis always an indicator of autosplenectomy in patients with systemic lupus erythematosus? Rheumatol Int 2017; 38:239-247. [PMID: 29119304 DOI: 10.1007/s00296-017-3872-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2017] [Accepted: 11/01/2017] [Indexed: 01/20/2023]
Abstract
In systemic lupus erythematosus (SLE), the most commonly encountered finding related to platelets is thrombocytopenia whereas thrombocytosis is rarely reported. Our aim here was to reveal the type and the frequency of thrombocytosis in SLE patients along with its causes. Data of patients were evaluated retrospectively. Patients who had a platelet count of > 450,000/mm3 (> 450 × 109/L) in at least two subsequent counts and lasting more than 6 months during the follow-up were considered to have "persistent thrombocytosis". Peripheral smear results of patients with thrombocytosis were analyzed, and spleen imaging was performed for autosplenectomy/hyposplenism to patients with persistent thrombocytosis. A total of 205 patients with SLE were included in the study [196 (95.6%) female, mean age 41.5 years]. Out of 12 patients (5.9%) with thrombocytosis, 9 (4.3%) had transient thrombocytosis and 3 patients (1.4%) had persistent thrombocytosis. Of those with transient thrombocytosis, 5 were associated with iron deficiency anemia (IDA), 2 to polyarthritis, and the remaining 2 to digital ischemia and/or cutaneous vasculitis. Of three patients with persistent thrombocytosis, one was identified to have had splenectomy due to resistant immune thrombocytopenic purpura, and the other two (0.9%) patients had autosplenectomy. The only independent risk factor for the development of thrombocytosis was the presence of cutaneous vasculitis (OR 10.79 (95% CI 2.14-54.47), p = 0.0004). During the course of SLE, frequency of thrombocytosis is similar to that of the general population and the most common cause is reactive thrombocytosis. If the thrombocytosis was persistent, rheumatologist must consider that the patient may have autosplenectomy/asplenia/hyposplenism.
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Affiliation(s)
- Döndü Üsküdar Cansu
- Division of Rheumatology, Department of Internal Medicine, Eskişehir Osmangazi University, 26480, Eskisehir, Turkey.
| | - Hava Üsküdar Teke
- Division of Hematology, Department of Internal Medicine, Eskişehir Osmangazi University, Eskisehir, Turkey
| | - Ahmet Musmul
- Department of Biostatistics, Eskişehir Osmangazi University, Eskisehir, Turkey
| | - Cengiz Korkmaz
- Division of Rheumatology, Department of Internal Medicine, Eskişehir Osmangazi University, 26480, Eskisehir, Turkey
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