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1.
Blood ; 134(Supplement_1): 44, 2019 Nov 13.
Artigo em Inglês | MEDLINE | ID: mdl-31724018

RESUMO

DISCLOSURES: Bader: Riemser, Neovii: Research Funding; Medac: Patents & Royalties, Research Funding; Amgen (Brasil), Novartis: Consultancy, Speakers Bureau; Celgene: Consultancy. Risitano:Alexion: Honoraria, Research Funding, Speakers Bureau; Achillion: Research Funding; Apellis: Honoraria, Membership on an entity's Board of Directors or advisory committees; Apellis: Honoraria, Membership on an entity's Board of Directors or advisory committees; Biocryst: Membership on an entity's Board of Directors or advisory committees; Alexion: Honoraria, Research Funding, Speakers Bureau; Amyndas: Consultancy; Samsung: Membership on an entity's Board of Directors or advisory committees; Samsung: Membership on an entity's Board of Directors or advisory committees; Roche: Membership on an entity's Board of Directors or advisory committees; Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding; Roche: Membership on an entity's Board of Directors or advisory committees; Novartis: Membership on an entity's Board of Directors or advisory committees, Research Funding; Amyndas: Consultancy; Biocryst: Membership on an entity's Board of Directors or advisory committees; Pfizer: Honoraria, Membership on an entity's Board of Directors or advisory committees; Pfizer: Honoraria, Membership on an entity's Board of Directors or advisory committees; Ra Pharma: Research Funding; Ra Pharma: Research Funding; Alnylam: Research Funding; Alnylam: Research Funding; Achillion: Research Funding. Peffault de Latour:Pfizer: Consultancy, Honoraria, Research Funding; Amgen: Research Funding; Novartis: Consultancy, Honoraria, Research Funding; Alexion: Consultancy, Honoraria, Research Funding.

2.
Front Immunol ; 10: 2194, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31620126

RESUMO

Mutations in the Sterile alpha motif domain containing 9 (SAMD9) gene have been described in patients with severe multisystem disorder, MIRAGE syndrome, but also in patients with bone marrow (BM) failure in the absence of other systemic symptoms. The role of hematopoietic stem cell transplantation (HSCT) in the management of the disease is still unclear. Here, we present a patient with a novel mutation in SAMD9 (c.2471 G>A, p.R824Q), manifesting with prominent gastrointestinal tract involvement and immunodeficiency, but without any sign of adrenal insufficiency typical for MIRAGE syndrome. He suffered from severe CMV (cytomegalovirus) infection at 3 months of age, with a delayed development of T lymphocyte functional response against CMV, profound T cell activation, significantly reduced B lymphocyte counts and impaired lymphocyte proliferative response. Cultured T cells displayed slightly lower calcium flux and decreased survival. At the age of 6 months, he developed severe neutropenia requiring G-CSF administration, and despite only mild morphological and immunophenotypical disturbances in the BM, 78% of the BM cells showed monosomy 7 at the age of 18 months. Surprisingly, T cell proliferation after CD3 stimulation and apoptosis of the cells normalized during the follow-up, possibly reflecting the gradual development of monosomy 7. Among other prominent symptoms, he had difficulty swallowing, requiring percutaneous endoscopic gastrostomy (PEG), frequent gastrointestinal infections, and perianal erosions. He suffered from repeated infections and periodic recurring fevers with the elevation of inflammatory markers. At 26 months of age, he underwent HSCT that significantly improved hematological and immunological laboratory parameters. Nevertheless, he continued to suffer from other conditions, and subsequently, he died at day 440 post-transplant due to sepsis. Pathogenicity of this novel SAMD9 mutation was confirmed experimentally. Expression of mutant SAMD9 caused a significant decrease in proliferation and increase in cell death of the transfected cells. Conclusion: We describe a novel SAMD9 mutation in a patient with prominent gastrointestinal and immunological symptoms but without adrenal hypoplasia. Thus, SAMD9 mutations should be considered as cause of enteropathy in pediatric patients. The insufficient therapeutic outcome of transplantation further questions the role of HSCT in the management of patients with SAMD9 mutations and multisystem involvement.

3.
Clin Immunol ; 201: 30-34, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30776520

RESUMO

Severe combined immunodeficiencies (SCID) comprise a group of genetic diseases characterized by abrogated development of T lymphocytes. In some case reports of atypical SCID patients elevated proportions of γδ T lymphocytes have been reported. However, it is unknown whether these γδ T cells modulate or reflect the patient's clinical phenotype. We investigated the frequency of elevated γδ T cell proportions and associations with clinical disease manifestations in a cohort of 76 atypical SCID patients. Increased proportions of γδ T lymphocytes were present in approximately 60% of these patients. Furthermore, we identified positive correlations between elevated proportions of γδ T cells and the occurrence of CMV infections and autoimmune cytopenias. We discuss that CMV infections might trigger an expansion of γδ T lymphocytes, which could drive the development of autoimmune cytopenias. We advocate that atypical SCID patients should be screened for elevated proportions of γδ T lymphocytes, CMV infection and autoimmune cytopenias.

4.
J Allergy Clin Immunol ; 143(6): 2238-2253, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-30660643

RESUMO

BACKGROUND: CD40 ligand (CD40L) deficiency, an X-linked primary immunodeficiency, causes recurrent sinopulmonary, Pneumocystis and Cryptosporidium species infections. Long-term survival with supportive therapy is poor. Currently, the only curative treatment is hematopoietic stem cell transplantation (HSCT). OBJECTIVE: We performed an international collaborative study to improve patients' management, aiming to individualize risk factors and determine optimal HSCT characteristics. METHODS: We retrospectively collected data on 130 patients who underwent HSCT for CD40L deficiency between 1993-2015. We analyzed outcome and variables' relevance with respect to survival and cure. RESULTS: Overall survival (OS), event-free survival (EFS), and disease-free survival (DFS) were 78.2%, 58.1%, and 72.3% 5 years after HSCT. Results were better in transplantations performed in 2000 or later and in children less than 10 years old at the time of HSCT. Pre-existing organ damage negatively influenced outcome. Sclerosing cholangitis was the most important risk factor. After 2000, superior OS was achieved with matched donors. Use of myeloablative regimens and HSCT at 2 years or less from diagnosis associated with higher OS and DFS. EFS was best with matched sibling donors, myeloablative conditioning (MAC), and bone marrow-derived stem cells. Most rejections occurred after reduced-intensity or nonmyeloablative conditioning, which associated with poor donor cell engraftment. Mortality occurred mainly early after HSCT, predominantly from infections. Among survivors who ceased immunoglobulin replacement, T-lymphocyte chimerism was 50% or greater donor in 85.2%. CONCLUSION: HSCT is curative in patients with CD40L deficiency, with improved outcome if performed before organ damage development. MAC is associated with better OS, EFS, and DFS. Prospective studies are required to compare the risks of HSCT with those of lifelong supportive therapy.

5.
Vnitr Lek ; 64(5): 530-536, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-30193523

RESUMO

Allogeneic hematopoietic stem cell transplantation (HSCT) is currently successfully used in the treatment of many non-malignant hematopoietic disorders, including acquired and inherited bone marrow failure. HSCT from a HLA-identical sibling donor (MSD) is the treatment of choice, better results are achieved using bone marrow graft. Conditioning regimens and graft-versus-host disease prophylaxis are different in dependence on the underlying disease, age and clinical condition of the patient, type of donor and stem cell graft. Transplantation from MSD is the first-line treatment for children and young adults with SAA. Patients with hemoglobinopathies and inherited bone marrow failure syndromes with available MSD should be referred for transplantation as soon as possible, before the development of serious complications and iron overload-related tissue damage. Indications for HSCT from matched unrelated donor in the treatment of non-malignant hematopoietic disorders are expanding in dependence on very good results in the last two decades. The aim of successfully HSCT is not only to increase the percentage of surviving patients but also to improve the quality of life with the minimum of early complications and late effects. Key words: allogeneic hematopoietic stem cell transplantation - aplastic anemia - hemoglobinopathy - inherited bone marrow failure.

6.
Blood Adv ; 2(7): 777-786, 2018 04 10.
Artigo em Inglês | MEDLINE | ID: mdl-29618462

RESUMO

Patients with juvenile idiopathic arthritis (JIA) can experience a severe disease course, with progressive destructive polyarthritis refractory to conventional therapy with disease-modifying antirheumatic drugs including biologics, as well as life-threatening complications including macrophage activation syndrome (MAS). Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is a potentially curative immunomodulatory strategy for patients with such refractory disease. We treated 16 patients in 5 transplant centers between 2007 and 2016: 11 children with systemic JIA and 5 with rheumatoid factor-negative polyarticular JIA; all were either refractory to standard therapy, had developed secondary hemophagocytic lymphohistiocytosis/MAS poorly responsive to treatment, or had failed autologous HSCT. All children received reduced toxicity fludarabine-based conditioning regimens and serotherapy with alemtuzumab. Fourteen of 16 patients are alive with a median follow-up of 29 months (range, 2.8-96 months). All patients had hematological recovery. Three patients had grade II-IV acute graft-versus-host disease. The incidence of viral infections after HSCT was high, likely due to the use of alemtuzumab in already heavily immunosuppressed patients. All patients had significant improvement of arthritis, resolution of MAS, and improved quality of life early following allo-HSCT; most importantly, 11 children achieved complete drug-free remission at the last follow-up. Allo-HSCT using alemtuzumab and reduced toxicity conditioning is a promising therapeutic option for patients with JIA refractory to conventional therapy and/or complicated by MAS. Long-term follow-up is required to ascertain whether disease control following HSCT continues indefinitely.

7.
Cytometry B Clin Cytom ; 92(5): 380-388, 2017 09.
Artigo em Inglês | MEDLINE | ID: mdl-26647177

RESUMO

BACKGROUND: Cytomegalovirus (CMV) specific T-cells are known to provide long-term control of CMV reactivation, which is a frequent complication of hematopoietic stem cell transplantation. We have studied 58 pediatric patients after hematopoietic stem cell transplantation who suffered from CMV reactivation to reveal which functional T cell subset is best correlating with successful reactivation resolution and which protects from reactivation episode. METHODS: Detection of 30 combinatorial subsets of four types of response to ex vivo CMV stimulation (IFNγ secretion, IL-2 secretion, CD40L upregulation and degranulation) that were detectable on either CD8+ or CD4+ T cells through flow cytometry intracellular cytokine staining was used. RESULTS: We found that the presence of CD8+ dual positive (IFNγ+ and IL-2+) cells is the most accurate functional parameter that can predict fast resolution of CMV reactivation. Next, we show that the presence of CD8+ dual positive (IFNγ+ and IL-2+) and CD8+ IFNγ+ cells provides a protective effect (a hazard risk of 0.28 (confidence interval 0.18 - 0.43) and 0.45 (CI 0.27 - 0.75), respectively) and the presence of corticotherapy increases the risk of reactivation (HR 2.47 (CI 1.82-3.36)). Thus, a patient without corticotherapy and with both of the critical T cell subsets present has a cumulative 19.6 times lower risk of developing CMV reactivation than a patient on corticotherapy and without CD8+ dual positive (IFNγ+ and IL-2+) or CD8+ IFNγ+ cells. CONCLUSIONS: We have established parameters of CMV specific functional response ex vivo that can be used in assisting clinical management of patients with CMV reactivation. © 2015 International Clinical Cytometry Society.


Assuntos
Infecções por Citomegalovirus/virologia , Citomegalovirus/metabolismo , Transplante de Células-Tronco Hematopoéticas , Subpopulações de Linfócitos T/imunologia , Viremia/metabolismo , Adolescente , Linfócitos T CD4-Positivos/metabolismo , Linfócitos T CD8-Positivos/metabolismo , Criança , Pré-Escolar , Feminino , Citometria de Fluxo/métodos , Transplante de Células-Tronco Hematopoéticas/métodos , Humanos , Lactente , Masculino , Adulto Jovem
8.
J Allergy Clin Immunol ; 133(4): 1134-41, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24679470

RESUMO

BACKGROUND: Severe combined immunodeficiency (SCID) is a syndrome characterized by profound T-cell deficiency. BCG vaccine is contraindicated in patients with SCID. Because most countries encourage BCG vaccination at birth, a high percentage of patients with SCID are vaccinated before their immune defect is detected. OBJECTIVES: We sought to describe the complications and risks associated with BCG vaccination in patients with SCID. METHODS: An extensive standardized questionnaire evaluating complications, therapeutics, and outcomes regarding BCG vaccination in patients given a diagnosis of SCID was widely distributed. Summary statistics and association analysis was performed. RESULTS: Data on 349 BCG-vaccinated patients with SCID from 28 centers in 17 countries were analyzed. Fifty-one percent of the patients had BCG-associated complications, 34% disseminated and 17% localized (a 33,000- and 400-fold increase, respectively, over the general population). Patients receiving early vaccination (≤1 month) showed an increased prevalence of complications (P = .006) and death caused by BCG-associated complications (P < .0001). The odds of experiencing complications among patients with T-cell numbers of 250/µL or less at diagnosis was 2.1 times higher (95% CI, 1.4-3.4 times higher; P = .001) than among those with T-cell numbers of greater than 250/µL. BCG-associated complications were reported in 2 of 78 patients who received antimycobacterial therapy while asymptomatic, and no deaths caused by BCG-associated complications occurred in this group. In contrast, 46 BCG-associated deaths were reported among 160 patients treated with antimycobacterial therapy for a symptomatic BCG infection (P < .0001). CONCLUSIONS: BCG vaccine has a very high rate of complications in patients with SCID, which increase morbidity and mortality rates. Until safer and more efficient antituberculosis vaccines become available, delay in BCG vaccination should be considered to protect highly vulnerable populations from preventable complications.


Assuntos
Vacina BCG/efeitos adversos , Imunodeficiência Combinada Severa/epidemiologia , Vacina BCG/imunologia , Pré-Escolar , Comorbidade , Feminino , Transplante de Células-Tronco Hematopoéticas , Humanos , Lactente , Recém-Nascido , Estimativa de Kaplan-Meier , Masculino , Prevalência , Estudos Retrospectivos , Risco , Imunodeficiência Combinada Severa/diagnóstico , Imunodeficiência Combinada Severa/terapia , Vacinação/efeitos adversos , Vacinação/legislação & jurisprudência
10.
Clin Immunol ; 131(1): 60-9, 2009 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-19081305

RESUMO

Allogeneic hematopoetic stem cell transplantation (HSCT) represents a unique opportunity to monitor the kinetics of reconstitution of dendritic cells (DCs) and their dynamics in distinct pathologies. We analyzed DCs reconstitution after myeloablative HSCT. We separately analyzed patients with acute GVHD. DCs were monitored from the earliest phase of hematopoetic reconstitution until day +365. Both myeloid DCs and plasmacytoid DCs appeared at earliest stages after engraftment and relative numbers within white blood cells compartment peaked between days 19-25 after HSCT. Their proportion then gradually declined and absolute numbers of both DC subsets remained lower than in controls during the whole follow-up. Patients with acute GVHD had significantly lower numbers of circulating DCs. Decrease in DC counts preceded onset of clinical symptoms by at least 24 h and was independent of corticosteroids administration. This study reveals quantification of plasmacytoid and myeloid DCs as a potential biomarker for the prediction of acute GVHD development.


Assuntos
Antígenos CD/biossíntese , Células Dendríticas/imunologia , Doença Enxerto-Hospedeiro/imunologia , Transplante de Células-Tronco Hematopoéticas/métodos , Adolescente , Adulto , Antígenos CD/imunologia , Antígeno B7-1/biossíntese , Antígeno B7-1/imunologia , Antígeno B7-2/biossíntese , Antígeno B7-2/imunologia , Contagem de Células , Criança , Pré-Escolar , Estudos de Coortes , Células Dendríticas/citologia , Feminino , Citometria de Fluxo , Doença Enxerto-Hospedeiro/patologia , Humanos , Imunoglobulinas/biossíntese , Imunoglobulinas/imunologia , Imunofenotipagem , Masculino , Glicoproteínas de Membrana/biossíntese , Glicoproteínas de Membrana/imunologia , Estudos Prospectivos , Adulto Jovem
11.
Pediatr Transplant ; 13(7): 919-22, 2009 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-19067913

RESUMO

We report an 18-yr-old female patient with repeated CMV reactivations after HSCT treated by several pre-emptive courses of virostatic therapy. Seven months after HSCT, she developed CMV encephalitis/retinitis. Initial therapy with GCV and hyperimmune globulin failed, and later on GCV-resistant strain was detected. Continual increase of CMV DNA in peripheral blood led us to combined therapy with CDV and FCV, which was successful and free of severe renal toxicity. To our best knowledge, this is the first reported case of successful CMV treatment with a combination of CDV and FCV.


Assuntos
Antivirais/uso terapêutico , Infecções por Citomegalovirus/tratamento farmacológico , Infecções por Citomegalovirus/etiologia , Citosina/análogos & derivados , Encefalite Viral/tratamento farmacológico , Encefalite Viral/etiologia , Foscarnet/uso terapêutico , Transplante de Células-Tronco Hematopoéticas/efeitos adversos , Organofosfonatos/uso terapêutico , Retinite/tratamento farmacológico , Retinite/etiologia , Adolescente , Cidofovir , Infecções por Citomegalovirus/complicações , Citosina/uso terapêutico , Encefalite Viral/complicações , Feminino , Transplante de Células-Tronco Hematopoéticas/métodos , Humanos , Leucemia Mieloide Aguda/complicações , Leucemia Mieloide Aguda/terapia , Retinite/complicações , Resultado do Tratamento
12.
Pediatr Transplant ; 12(1): 24-31, 2008 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-18186885

RESUMO

Allogeneic HSCT is a curative treatment, when chemotherapy fails, for certain malignant diseases. In Europe, only 15% of the indicated children have an HLA-matched sibling available; in 65-70% of others, HLA allele-matched (9-10/10) UDs can be identified. For the rest, it is necessary to identify other alternative donors (HLA-mismatched family or unrelated cord blood). We present our data of HSCT using HLA partially allele-mismatched (7-8/10) UDs in 24 children with leukemia. Uniform GvHD prophylaxis was used (rATG, CsA and MTX). Acute GvHD grade II was diagnosed in 70.8% of the patients and grade III-IV in 12.5%. Overall incidence of chronic GvHD was 38.7% (extensive in 30%). The probability of EFS was 60.3% (95% CI 35.5-78.1) and OS was 74.9 (95% CI 49.1-88.9). No difference in survival between PBSC and BM recipients was observed. TRM at day + 100 was 4%, and overall was 12.5%. We conclude that used combination of drugs for GvHD prophylaxis is efficient even for patients transplanted with grafts from a HLA-mismatched UDs. It enables stable engraftment, good control of GvHD, full reconstitution of immunity, and is not connected with unacceptable transplant-related mortality.


Assuntos
Doença Enxerto-Hospedeiro/prevenção & controle , Leucemia/cirurgia , Transplante de Células-Tronco , Adolescente , Soro Antilinfocitário/uso terapêutico , Transplante de Medula Óssea , Criança , Pré-Escolar , Feminino , Humanos , Leucemia/mortalidade , Leucemia Mielogênica Crônica BCR-ABL Positiva/cirurgia , Masculino , Doadores de Tecidos , Imunologia de Transplantes
14.
Pediatr Transplant ; 11(4): 441-7, 2007 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-17493228

RESUMO

We present an infant with cDGS overlapping with CHARGE syndrome, who suffered from T-cell deficiency treated with screened healthy DLI from an unrelated donor (8/10 match). The first dose of DLI (1.1 x 10(6) CD3+/kg) was administered at the age of six months, the second one (0.9 x 10(6) CD3+/kg) 36 days later. No conditioning was employed, GvHD prophylaxis consisting of CsA was used only during the second infusion. Since day+10 after the first DLI, split chimerism showing T-cell engraftment has been documented. Proliferative response to PHA was detected on day+145. The treatment was complicated by severe acute GvHD (grade II-III) after the first DLI and prolonged chronic liver cholestatic GvHD developing after the second DLI. Vigorous EBV proliferation four wk after the second DLI was accompanied by peripheral expansion of CD8+ donor cells. The patient, 26-months old, is clinically well and has slowly started to gain his developmental milestones. We believe that infusions of small doses of DLI from an unrelated donor represent a potentially helpful therapeutic option in patients with cDGS/CHARGE phenotype.


Assuntos
Coloboma/terapia , Síndrome de DiGeorge/terapia , Transfusão de Linfócitos/métodos , Anus Imperfurado/terapia , Síndrome de DiGeorge/sangue , Orelha/anormalidades , Otopatias/congênito , Otopatias/terapia , Seguimentos , Genitália Masculina/anormalidades , Doença Enxerto-Hospedeiro/etiologia , Doença Enxerto-Hospedeiro/prevenção & controle , Transtornos do Crescimento/terapia , Cardiopatias Congênitas/terapia , Humanos , Recém-Nascido , Deficiência Intelectual/terapia , Transfusão de Linfócitos/efeitos adversos , Masculino , Linfócitos T
15.
Pediatr Blood Cancer ; 48(1): 93-100, 2007 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-16521130

RESUMO

BACKGROUND: The level of minimal residual disease (MRD) prior to allogeneic hematopoietic stem cell transplantation (HSCT) has been shown to be an independent prognostic factor for outcome of pediatric patients with high-risk acute lymphoblastic leukemia (ALL). Retrospective studies which used (semi-) quantitation of clone-specific immunoglobulin/T-cell receptor (Ig/TCR) rearrangements have documented the feasibility and practicality of this technique. This approach has also been disputed due to the occurrence of clonal evolution and generally high MRD levels prior to HSCT. PROCEDURE: In our prospective study, MRD before and after HSCT was monitored using quantitative real-time PCR in a cohort of 36 children with ALL consecutively transplanted in our center between VIII/2000 and VII/2004. RESULTS: In 25 of 36 patients, MRD level prior HSCT was assessed. Seventeen patients were classified as MRD-negative and eight were MRD-positive up to 9 x 10(-2). In MRD-positive subgroup, seven events (six relapses) occurred post-transplant in striking contrast to only one relapse in MRD-negative subgroup (event-free survival (EFS) log-rank P < 0.0001). MRD proved to be the only significant prognostic factor in a multivariate analysis (P < 0.0001). Adoptive immunotherapy including donor lymphocyte infusions in patients with adverse dynamics of MRD after HSCT had only limited and/or temporary effect. Clonal evolution did not present a problem precluding MRD monitoring in any of patients suffering a post-transplant relapse. CONCLUSIONS: We show that MRD quantitation using clonal Ig/TCR rearrangements successfully assesses the risk in pediatric ALL patients undergoing allogeneic HSCT. As our ability to treat detectable MRD levels after HSCT is very limited, alternative strategies for MRD-positive patients prior HSCT are necessary.


Assuntos
Transplante de Células-Tronco Hematopoéticas , Monitorização Fisiológica , Neoplasia Residual/mortalidade , Leucemia-Linfoma Linfoblástico de Células Precursoras/mortalidade , Adolescente , Criança , Pré-Escolar , Intervalo Livre de Doença , Feminino , Seguimentos , Rearranjo Gênico do Linfócito B/genética , Rearranjo Gênico do Linfócito T/genética , Transplante de Células-Tronco Hematopoéticas/mortalidade , Humanos , Imunoterapia Adotiva/mortalidade , Lactente , Transfusão de Linfócitos/mortalidade , Masculino , Neoplasia Residual/genética , Reação em Cadeia da Polimerase , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Leucemia-Linfoma Linfoblástico de Células Precursoras/terapia , Valor Preditivo dos Testes , Recidiva , Estudos Retrospectivos , Fatores de Risco , Transplante Homólogo , Resultado do Tratamento
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