Natural killer cells 56bnght16- have higher counts in the umbilical cord blood than in the adult peripheral blood

ABSTRACT Introduction and hypothesis: Umbilical cord blood (UCB) is an alternative source of hematopoietic stem cells for allogeneic hematopoietic stem cell transplantation in the absence of a compatible donor. The UCB transplantation has a lower incidence of chronic graft versus host disease (GvHD), but is associated with slower engraftment and slower immune reconstitution, compared to other sources. Dendritic cells (DCs) and Natural Killer cells (NKs) play a central role in the development of GvHD and the graft versus leukemia (GvL) effect, as well as in the control of infectious complications. Method: We quantified by multiparametric flow cytometry monocytes, lymphocytes, NK cells, and DCs, including their subsets, in UCB samples from 54 healthy newborns and peripheral blood (PB) from 25 healthy adult volunteers. Results: In the UCB samples, there were higher counts of NK cells 56bright16- (median 0.024 × 109/L), compared to the PB samples (0.012 × 109/L, p < 0.0001), NK 56dim16bright (median 0.446 × 109/L vs. 0.259 × 109/L for PB samples, p = 0.001) and plasmacytoid dendritic cells (pDCs, median 0.008 × 109/L for UCB samples vs. 0.006 × 109/L for PB samples, p = 0.03). Moreover, non-classic monocyte counts were lower in UCB than in PB (median 0.024 × 109/L vs. 0.051 × 109/L, respectively, p < 0.0001). Conclusion: In conclusion, there were higher counts of NK cells and pDCs and lower counts of non-classic monocytes in UCB than in PB from healthy individuals. These findings might explain the lower incidence and severity of chronic GvHD, although maintaining the GvL effect, in UCB transplant recipients, compared to other stem cell sources.

Updating recommendations of the Brazilian Group of Flow Cytometry (GBCFLUX) for diagnosis of acute leukemias using four-color flow cytometry panels

ABSTRACT Introduction: Flow cytometry has become an increasingly important tool in the clinical laboratory for the diagnosis and monitoring of many hematopoietic neoplasms. This method is ideal for immunophenotypic identification of cellular subpopulations in complex samples, such as bone marrow and peripheral blood. In general, 4-color panels appear to be adequate, depending on the assay. In acute leukemias (ALs), it is necessary identify and characterize the population of abnormal cells in order to recognize the compromised lineage and classify leukemia according to the WHO criteria. Although the use of eightto ten-color immunophenotyping panels is wellestablished, many laboratories do not have access to this technology. Objective and Method: In 2015, the Brazilian Group of Flow Cytometry (Grupo Brasileiro de Citometria de Fluxo, GBCFLUX) proposed antibody panels designed to allow the precise diagnosis and characterization of AL within available resources. As many Brazilian flow cytometry laboratories use four-color immunophenotyping, the GBCFLUX has updated that document, according to current leukemia knowledge and after a forum of discussion and validation of antibody panels. Results: Recommendations for morphological analysis of bone marrow smears and performing screening panel for lineage (s) identification of AL were maintained from the previous publication. The lineage-oriented proposed panels for B and T cell acute lymphoblastic leukemia (ALL) and for acute myeloid leukemia (AML) were constructed for an appropriate leukemia classification. Conclusion: Three levels of recommendations (i.e., mandatory, recommended, and optional) were established to enable an accurate diagnosis with some flexibility, considering local laboratory resources and patient-specific needs.

Minimal residual disease assessment in acute lymphoblastic leukemia by 4-color flow cytometry: Recommendations from the MRD Working Group of the Brazilian Society of Bone Marrow Transplantation

Abstract Introduction: The minimal residual disease (MRD) status plays a crucial role in the treatment of acute lymphoblastic leukemia (ALL) and is currently used in most therapeutic protocols to guide the appropriate therapeutic decision. Therefore, it is imperative that laboratories offer accurate and reliable results through well standardized technical processes by establishing rigorous operating procedures. Method: Our goal is to propose a monoclonal antibody (MoAb) panel for MRD detection in ALL and provide recommendations intended for flow cytometry laboratories that work on 4-color flow cytometry platforms. Results and conclusion: The document includes pre-analytical and analytical procedures, quality control assurance, technical procedures, as well as the information that needs to be included in the reports for clinicians.

Diagnosis and treatment of chronic lymphocytic leukemia: recommendations from the Brazilian Group of Chronic Lymphocytic Leukemia

ABSTRACT Chronic lymphocytic leukemia is characterized by clonal proliferation and progressive accumulation of B-cell lymphocytes that typically express CD19+, CD5+ and CD23+. The lymphocytes usually infiltrate the bone marrow, peripheral blood, lymph nodes, and spleen. The diagnosis is established by immunophenotyping circulating B-lymphocytes, and prognosis is defined by two staging systems (Rai and Binet) established by physical examination and blood counts, as well as by several biological and genetic markers. In this update, we present the recommendations from the Brazilian Group of Chronic Lymphocytic Leukemia for the diagnosis and treatment of chronic lymphocytic leukemia. The following recommendations are based on an extensive literature review with the aim of contributing to more uniform patient care in Brazil and possibly in other countries with a similar social-economic profile.

Recommendations for quality assurance in multiparametric flow cytometry: first consensus of the Brazilian Group of Flow Cytometry (GBCFLUX) / Recomendações para garantia da qualidade em citometria de fluxo multiparamétrica: primeiro consenso do Grupo Brasileiro de Citometria de Fluxo (GBCFLUX)

ABSTRACT The Brazilian Group of Flow Cytometry (Grupo Brasileiro de Citometria de Fluxo [GBCFLUX]), founded on April 24, 2010, is composed of experts in flow cytometry (FC) area who have the common objective of contributing to technical and scientific advances in Brazilian clinical and research laboratories. Among GBCFLUX working groups, the Quality Control (QC) subcommittee is responsible for discussing data in the literature and contributes to the quality assurance of the pre-analytical, analytical and post-analytical process in FC. The QC subcommittee's actions began through meetings and lectures, in which data from the literature were reviewed and discussed with all participating members of the GBCFLUX. In a second step, it was decided to draw up a text of technical and scientific consensus recommendations, informative and educative, for dissemination to all FC working groups in Brazil. To this effect, a questionnaire with objective responses was designed and sent to 35 recognized Brazilian institutions, in order to evaluate the QC profile of these institutions. Thus, the QC technical-scientific recommendations, which will be described in this updating article, are intended to ensure the process quality, technical standardization, and reproducibility of results in FC.

RESUMO O Grupo Brasileiro de Citometria de Fluxo (GBCFLUX), fundado em 24 de abril de 2010, é composto por especialistas da área de citometria de fluxo (CF) que possuem o objetivo comum de contribuir para avanços técnico-científicos em laboratórios clínicos e de pesquisa brasileiros. Entre os grupos de trabalho do GBCFLUX, o subcomitê de Controle de Qualidade (CQ) é responsável por discutir dados da literatura e contribuir para a garantia da qualidade do processo pré-analítico, analítico e pós-analítico em CF. As ações do subcomitê de CQ iniciaram-se por meio de reuniões e palestras, nas quais dados da literatura foram revisados e discutidos com todos os membros participantes do GBCFLUX. Em uma segunda etapa, definiu-se elaborar um texto de recomendações consensuais técnicocientíficas, informativas e educativas para divulgação a todos os grupos que trabalham com CF no Brasil. Para tanto, foi elaborado um questionário com respostas objetivas, sendo enviado para 35 instituições brasileiras cadastradas, com a finalidade de avaliar o perfil de CQ dessas instituições. Dessa forma, as recomendações técnico-científicas de CQ que serão descritas neste artigo de atualização têm o objetivo de contribuir para a garantia da qualidade do processo, a padronização técnica e a reprodutibilidade dos resultados em CF.

Proposal for the standardization of flow cytometry protocols to detect minimal residual disease in acute lymphoblastic leukemia

Minimal residual disease is the most powerful predictor of outcome in acute leukemia and is useful in therapeutic stratification for acute lymphoblastic leukemia protocols. Nowadays, the most reliable methods for studying minimal residual disease in acute lymphoblastic leukemia are multiparametric flow cytometry and polymerase chain reaction. Both provide similar results at a minimal residual disease level of 0.01% of normal cells, that is, detection of one leukemic cell in up to 10,000 normal nucleated cells. Currently, therapeutic protocols establish the minimal residual disease threshold value at the most informative time points according to the appropriate methodology employed. The expertise of the laboratory in a cancer center or a cooperative group could be the most important factor in determining which method should be used. In Brazil, multiparametric flow cytometry laboratories are available in most leukemia treatment centers, but multiparametric flow cytometry processes must be standardized for minimal residual disease investigations in order to offer reliable and reproducible results that ensure quality in the clinical application of the method. The Minimal Residual Disease Working Group of the Brazilian Society of Bone Marrow Transplantation (SBTMO) was created with that aim. This paper presents recommendations for the detection of minimal residual disease in acute lymphoblastic leukemia based on the literature and expertise of the laboratories who participated in this consensus, including pre-analytical and analytical methods. This paper also recommends that both multiparametric flow cytometry and polymerase chain reaction are complementary methods, and so more laboratories with expertise in immunoglobulin/T cell receptor (Ig/TCR) gene assays are necessary in Brazil.

Multiple myeloma with cells typically seen in storage diseases

We report on a rare case of multiple myeloma with atypically large cells containing a great amount of azurophilic inclusions usually seen in storage diseases.

Caracterização imunofenotípica das células plasmáticas em pacientes portadores de mieloma múltiplo / Immunophenotypic characterization of plasma cells in patients with multiple myeloma

INTRODUÇÃO E OBJETIVO: O mieloma múltiplo (MM) é uma doença maligna incurável caracterizada pela proliferação de um único clone de plasmócitos na medula óssea. O objetivo deste estudo foi avaliar a frequência e o valor prognóstico da expressão dos fenótipos aberrantes em pacientes com MM por meio de citometria de fluxo multiparamétrica. MÉTODOS: O estudo foi realizado no Hospital São Paulo/Disciplina de Hematologia e Hemoterapia da Universidade Federal de São Paulo (UNIFESP), sendo analisados de maneira prospectiva 30 pacientes portadores de MM ao diagnóstico. Na tentativa de identificar as células mielomatosas por citometria de fluxo (FACScalibur, BD), foram utilizados anticorpos monoclonais anti-CD138, anti-CD38, anti-CD45 específicos para seleção dos plasmócitos. O grupo controle consistiu em quatro doadores saudáveis de medula óssea. RESULTADOS: Todos os plasmócitos mielomatosos expressaram pelo menos um fenótipo aberrante, e CD56+++, CD117++, CD33++, CD13++, CD28++ foram os marcadores mais frequentes, observados em 88 por cento dos pacientes. Os marcadores linfoides foram encontrados nos casos com maior número de fenótipos aberrantes. DISCUSSÃO: Os antígenos CD56+++ e CD28++ apresentaram altos níveis de β2-microglobulina, sendo estes associados a estágios mais agressivos da doença e maior massa tumoral. A ausência da molécula de adesão CD56 foi relacionada com altos níveis de β2M e de cálcio iônico, mostrando que este achado pode ter valor prognóstico. CONCLUSÃO: A partir deste estudo concluiu-se que os fenótipos aberrantes estão presentes na maioria dos casos de MM e que a imunofenotipagem por citometria de fluxo multiparamétrica é uma boa ferramenta para distinguir células plasmáticas normais dos plasmócitos mielomatosos.

INTRODUCTION AND OBJECTIVE: Multiple myeloma is an incurable malignancy characterized by the proliferation of a single clone of plasma cells in bone marrow. The aim of this study was to evaluate the frequency and prognostic value of the expression of aberrant phenotypes in patients with multiple myeloma by multiparametric flow cytometry. METHODS: The study was carried out at Department of Hematology and Hemotherapy of Federal University of São Paulo and 30 patients with MM were analyzed prospectively. In an attempt to identify myeloma cells by flow cytometry (FACSCalibur, BD), specific monoclonal antibodies anti-CD138, anti-CD38 and anti-CD45 were used for the selection of plasma cells. The control group comprised four healthy bone marrow donors. RESULTS: All myeloma plasma cells expressed at least one aberrant phenotype and CD56+++, CD117++, CD33++, CD13++ and CD28++ markers were more frequently observed in 88 percent of patients. Lymphoid markers were found in cases with a higher number of aberrant phenotypes. DISCUSSION: CD56+++ and CD28++ antigens showed high levels of β2-microglobulin, which are associated with more aggressive stages of the disease and larger tumor mass. The absence of adhesion molecule CD56 was associated with high levels of β2M and calcium ion, showing that this finding may have prognostic value. CONCLUSION: From this study it was concluded that the aberrant phenotypes are present in most cases of MM, and immunophenotyping by multiparametric flow cytometry is a useful tool to distinguish normal plasma cells from myeloma plasma cells.

Hemoglobinúria paroxística noturna: da fisiopatologia ao tratamento / Paroxysmal nocturnal hemoglobinuria: from physiopathology to treatment

Hemoglobinúria paroxística noturna (HPN) é uma anemia hemolítica crônica adquirida rara, de curso clínico extremamente variável. Apresenta-se frequentemente com infecções recorrentes, neutropenia e trombocitopenia, e surge em associação com outras doenças hematológicas, especialmente com síndromes de falência medular, como anemia aplásica e síndrome mielodisplásica. É considerada ainda um tipo de trombofilia adquirida, apresentando-se com tromboses venosas variadas, com especial predileção por trombose de veias hepáticas e intra-abdominais, sua maior causa de mortalidade. A tríade anemia hemolítica, pancitopenia e trombose faz da HPN uma síndrome clínica única, que deixou de ser encarada como simples anemia hemolítica adquirida para ser considerada um defeito mutacional clonal da célula-tronco hematopoética (CTH). A mutação ocorre no gene da fosfaditilinositolglicana classe-A, e resulta no bloqueio precoce da síntese de âncoras de glicosilfosfaditilinositol (GPI), responsáveis por manter aderidas à membrana plasmática dezenas de proteínas com funções específicas. A falência em sintetizar GPI madura gera redução de todas as proteínas de superfície normalmente ancoradas por ela. Dentre elas estão o CD55 e o CD59, que controlam a ativação da cascata do complemento. Assim, na HPN há aumento da susceptibilidade de eritrócitos ao complemento, gerando hemólise. Revisa-se aqui sua fisiopatologia, curso clínico, os tratamentos disponíveis com ênfase para o transplante de células-tronco hematopoéticas alogênicas e para o eculizumab, um anticorpo monoclonal humanizado que bloqueia a ativação do complemento terminal no nível C5 e previne a formação do complexo de ataque à membrana, a primeira droga a demonstrar eficácia no tratamento da HPN.

Paroxysmal nocturnal hemoglobinuria (PNH) is a rare disorder, an acquired chronic hemolytic anemia, often associated with recurrent nocturnal exacerbations, recurrent infections, neutropenia, thrombocytopenia, and episodes of venous thrombosis. Its clinical course is highly variable. It frequently arises in association with bone marrow failure, particularly aplastic anemia and myelodysplastic syndrome. It is also an acquired thrombophilia, presenting with a variety of venous thrombosis, mainly manifested with intra-abdominal thrombosis, here the major cause of mortality. The triad of hemolytic anemia, pancytopenia, and thrombosis makes a truly unique clinical syndrome of PNH, which was reclassified from a purely acquired hemolytic anemia to a hematopoietic stem cell mutation defect of the phosphatidyl inositol glycanclass-A gene. This mutation results in an early block in the synthesis of glycosylphosphatidylinositol (GPI) anchors, responsible for binding membrane functional proteins. Among these proteins are the complement inhibitors, especially CD55 and CD59, that play a key role in protecting blood cells from complement cascade attack. Therefore, in PNH occurs an increased susceptibility of red cells to complement, and consequently, hemolysis. We here review PNH physiopathology, clinical course, and treatment options, especially eculizumab, a humanized monoclonal antibody that blocks the activation of terminal complement at C5 and prevents formation of the terminal complement complex, the first effective drug therapy for PNH.

Human neutrophil alloantigens systems

Neutrophil alloantigens are involved in a variety of clinical conditions including immune neutropenias, transfusion-related acute lung injury (TRALI), refractoriness to granulocyte transfusions and febrile transfusion reactions. In the last decade, considerable progress has been made in the characterization of the implicated antigens. Currently, seven antigens are assigned to five human neutrophil antigen (HNA) systems. The HNA-1a, HNA-1b and HNA-1c antigens have been identified as polymorphic forms of the neutrophil Fcγ receptor IIIb (CD16b), encoded by three alleles. Recently, the primary structure of the HNA-2a antigen was elucidated and the HNA-2a-bearing glycoprotein was identified as a member of the Ly-6/uPAR superfamily, which has been clustered as CD177. The HNA-3a antigen is located on a 70-95 kDa glycoprotein; however, its molecular basis is still unknown. Finally, the HNA-4a and HNA-5a antigens were found to be caused by single nucleotide mutations in the αM (CD11b) and αL (CD11a) subunits of the leucocyte adhesion molecules (β2 integrins). Molecular and biochemical characterization of neutrophil antigenshave expanded our diagnostic tools by the introduction of genotyping techniques and immunoassays for antibody identification. Further studies in the field of neutrophil immunology will facilitate the prevention and management of transfusion reactions and immune diseases caused by neutrophil antibodies.

Os aloantígenos de neutrófilos estão associados a várias condições clínicas como neutropenias imunes, insuficiência pulmonar relacionada à transfusão (TRALI), refratariedade à transfusão de granulócitos, e reações transfusionais febris. Na última década, foi observado considerável progresso na caracterização dos aloantígenos envolvidos nestas condições clínicas. Atualmente sete antígenos estão incluídos em cinco sistemas de antígenos de neutrófilo humano (HNA). Os antígenos HNA-1a, HNA-1b e HNA-1c foram identificados como formas polimórficas do receptor Fcγ RIIIb (CD16b), codificados por três alelos. Recentemente, a estrutura primária do antígeno HNA-2a foi elucidada e a glicoproteína carreadora do antígeno foi identificada como um membro da superfamília Ly-6/uPARe designada como CD177. O antígeno HNA-3a está localizadoem uma glicoproteína de 70-90 kDa, entretanto sua base molecular ainda é desconhecida. Finalmente, os antígenos HNA-4ae HNA-5a são resultantes de mutações de um único nucleotídeo nas subunidades αM (CD11b) and αL (CD11a) das moléculas de adesão de leucócitos (β2 integrinas). A caracterização molecular e bioquímica dos antígenos neutrofílicos permitiu a expansão das ferramentas diagnósticas pela introdução de técnicas de genotipagem e imunoensaios para a identificação de anticorpos. Novos estudos envolvendo a imunologia de granulócitos serão de grande valor para a prevenção e tratamento de reações transfusionais e doenças imunes causadas por aloanticorpos de neutrófilos.

Prevalence of FMS-like tyrosine kinase 3/internal tandem duplication (FLT3/ITD+) in de novo acute myeloid leukemia patients categorized according to cytogenetic risk / Prevalência de duplicação interna in tandem/fms-receptor tirosino-quinase (DIT/FLT3) em pacientes com leucemia mielóide aguda de novo classificados conforme grupos citogenéticos de risco

CONTEXT AND OBJECTIVE: The mechanism involved in leukemogenesis remains unclear and more information about the disruption of the cell proliferation, cell differentiation and apoptosis of neoplastic cells is required. DESIGN AND SETTING: Cross-sectional prevalence study at the Discipline of Hematology, Hospital São Paulo, Universidade Federal de São Paulo. METHODS: We investigated FMS-like tyrosine kinase 3/internal tandem duplication (FLT3/ITD+) in 40 adult patients with de novo acute myeloid leukemia (AML), categorized according to cytogenetic results, from September 2001 to May 2005. RESULTS: Thirteen patients (32.5 percent) were classified as presenting the favorable karyotype, 11 patients (27.5 percent) as an intermediate group, 7 patients (17 percent) as an undefined group and 9 patients (22.5 percent) as the unfavorable group. FLT3/ITD+ was found in 10 patients (25 percent): 3 with FLT3/ITD+ and favorable karyotype; 4 with FLT3/ITD+ and intermediate karyotype; 2 with FLT3/ITD+ and undefined karyotype; and only 1 with FLT3/ITD+ and unfavorable karyotype. Among the patients without FLT3/ITD+, 10 presented favorable karyotype, 8 intermediate, 4 undefined and 8 unfavorable karyotype. The cytogenetic results showed no correlations between FLT3/ITD presence and the prognostic groups (P = 0.13). We found that 2 patients were still alive more than 24 months later, FLT3/ITD+ did not influence the patients' survival rate. CONCLUSION: We found the same frequency of AML with FLT3/ITD+ in both the favorable and intermediate prognosis groups. Only one patient presented AML, FLT3/ITD+ and unfavorable karyotype (the hypothetical worst clinical situation). Therefore, the prognostic advantage of favorable cytogenetics among patients with FLT3/ITD+ remains to be elucidated, for it to be better understood.

CONTEXTO E OBJETIVO: O mecanismo envolvido na leucemogênese permanece obscuro, e maiores informações a respeito das inadequadas proliferação, diferenciação e apoptose das células neoplásicas é fundamental. TIPO DE ESTUDO E LOCAL: Estudo transversal de prevalência na Disciplina de Hematologia e Hemoterapia, Hospital São Paulo, Universidade Federal de São Paulo. MÉTODOS: Nós pesquisamos a duplicação interna in tandem (DIT) do gene FLT3 (Fms-like tyrosine kinase) em 40 pacientes adultos com leucemia mielóide aguda (LMA) de novo, classificados de acordo com os resultados de cariótipo em banda G, de setembro de2001 a maio de 2005. RESULTADOS: Treze pacientes (32,5 por cento) foram classificados como cariótipo favorável, 11 pacientes (27,5 por cento) como grupo intermediário, 7 pacientes (17 por cento) no grupo de prognóstico indefinido e os restantes 9 pacientes (22,5 por cento) foram alocados como desfavorável. A DIT/FLT3 foi encontrada em 10 pacientes (25 por cento), 3 pacientes com DIT/FLT3 e cariótipo favorável, 4 com DIT/FLT3 e cariótipo intermediário, 2 com DIT/FLT3 e cariótipo de prognóstico indefinido e somente 1 paciente com DIT/FLT3 e cariótipo desfavorável. Entre os pacientes sem DIT/FLT3, 10 apresentaram cariótipo favorável, 8 com cariótipo intermediário, 4 com cariótipo de prognóstico indefinido e 8 com cariótipo desfavorável. Não houve correlação entre a presença de DIT/FLT3 e os grupos de prognóstico conforme resultados de citogenética (P = 0,13). No presente estudo encontramos 2 pacientes vivos por mais de 24 meses. A presença de DIT/FLT3 não influenciou a taxa de sobrevida dos pacientes. CONCLUSÃO: Nós observamos a mesma frequência de LMA com DIT/FLT3 tanto no grupo de cariótipo favorável quanto no grupo intermediário e somente um paciente com LMA e DIT/FLT3 e cariótipo desfavorável, hipoteticamente o pior achado clínico. Desta forma, a vantagem prognóstica do cariótipo favorável em pacientes DIT/FLT3 permanece a ser esclarecida ...

O papel da expressão de Bcl-2 em material obtido por PAAF no diagnóstico de doenças linfoproliferativas B / The role of Bcl-2 expression in fine needle aspiration specimens for the diagnostic accuracy in lymphoproliferative diseases

INTRODUÇÃO: O diagnóstico das doenças linfoproliferativas (DLP) tradicionalmente baseia-se no estudo histológico dos linfonodos (LN) acrescido de imuno-histoquímica. A imunofenotipagem (IFT) pela citometria de fluxo (CF) é uma ferramenta sensível e rápida, que pode ser aplicada nas DLP, em material obtido por punção aspirativa por agulha fina (PAAF) de LN. O Bcl-2 é um proto-oncogene que se expressa em várias DLP, porém em níveis especialmente elevados no linfoma folicular (LF). OBJETIVOS: Diagnosticar DLP, através de morfologia e imunofenotipagem por CF, em amostras obtidas por PAAF de LN. MATERIAL e MÉTODO: Amostras de 25 pacientes com adenopatias e de duas tonsilas reacionais foram analisadas pela morfologia e IFT, utilizando um painel inicial de AcMo (CD3, CD4, CD8, CD19, anti-kappa; e anti-lambda;), ampliado conforme a necessidade (CD5, CD10, CD11c, CD23, CD79b, sIgM, FMC-7 e Bcl-2). Os resultados foram comparados com a histologia. RESULTADOS:Dos 25 casos, quatro foram classificados como reacionais e 21 como DLP-B, havendo concordância com resultados histológicos em todos os casos. A intensidade média de fluorescência (IMF) da Bcl-2 no LF (19,92) foi maior que em outras DLP-B (11,93) e que nos controles (3,49) (p = 0,032). CONCLUSÃO:A PAAF de LN combinada com a citomorfologia e a IFT por CF permite uma rápida diferenciação entre os processos reacionais e linfoproliferativos B. A elevada expressão da Bcl-2 nos LFs pela citometria mostra sua utilidade no diagnóstico do tipo mais freqüente das DLP-B. A obtenção de células por PAAF requer treinamento e recomendamos mais de uma punção.

BACKGROUND: The diagnosis of lymphoproliferative disorders (LPD) is routinely made through histological and immunohistochemical analysis of lymph nodes. Immunophenotyping by flow cytometry (FC) is a sensitive and fast tool, which may be applied in samples obtained through fine needle aspiration for the diagnosis of LPD. Bcl-2 is a proto-oncogene that appears in several LPD and it has a significantly high expression in follicular lymphomas. OBJECTIVES: to diagnose LPD in FNA samples through morphology and flow cytometry immunophenotyping. MATERIAL AND METHODS: Samples from 25 patients with lymphadenopathies and 2 reactive tonsils were studied through morphology and immunophenotyping. The antigens expressions were evaluated by using a screening panel of monoclonal antibodies (CD3, CD4, CD8, CD19, light chains kappa; and lambda), followed by CD5, CD10, CD11c, CD23, CD79b, sIgM, FMC-7 and Bcl-2 when required. The results were compared with histology. RESULTS:Four out of 25 samples were reactive processes and 21were B-LPD. In all cases there was consistency with histological results. The mean fluorescence intensity of Bcl-2 in Follicular Lymphoma (19.92) was higher compared with other lymphoproliferative diseases (11.93) and controls (3.49) (p = 0.032). CONCLUSION: Fine needle aspiration of lymph nodes associated with cytomorphology and flow cytometry immunophenotyping allows a fast differentiation between reactive processes and B lymphoproliferative cases. The high expression of Bcl-2 by cytometry shows its usefulness in the diagnosis of the most frequent type of B-LPD. Fine needle aspiration sampling requires training and more than one aspiration is recommended.

Densidade mineral óssea em crianças talassêmicas: uma experiência brasileira / Bone mineral density in thalassemic children: a Brazilian experience

A osteoporose, caracterizada por aumento da fragilidade óssea e suscetibilidade a fraturas, é inversamente proporcional ao pico de massa óssea adquirido na infância. Por outro lado, a doença óssea é uma importante causa de morbidade em pacientes portadores de beta-talassemia maior (TM). Apesar de intensamente descrita em pacientes talassêmicos adultos, não existem estudos sobre as alterações de densidade óssea em crianças talassêmicas brasileiras. Foram avaliados 11 pacientes (idade medianade 10,0, variando de 5 a 12 anos), portadores de TM, e 24 crianças (idade mediana de 9,5, variando de 6 a 12 anos) saudáveis, utilizando medida de emissão dupla de raios-X para avaliar a densidade mineral óssea (DMO). A análise de marcadores bioquímicos tais como concentração de ferritina sérica, cálcio ionizado, fosfatase alcalina,fósforo, albumina, tempo de protrombina e fator V foi realizada. A estatura foisignificativamente diferente entre os dois grupos estudados, p<0,05. Os pacientes talassêmicos mostraram valores significativamente inferiores de DMO (mediana 0,61 g/cm2) quando comparados aos indivíduos controles (mediana 0,69 g/cm2), p < 0,05. A relevante perda óssea encontrada na maioria das crianças talassêmicas estudadas reforça a necessidade de identificação e tratamento adequado da osteopenia, reduzindo a morbidade destes indivíduos. Este é o primeiro estudo, descrito na literatura, que avalia a DMO em crianças talassêmicas brasileiras.

Osteoporosis is characterized by low bone mass and disruption of bone architecture, resulting in greater bone fragility with increased risk of fractures. Bone disease is an important cause of morbidity in beta thalassemia major patients. Osteoporosis has been described extensively in adult thalassemia. However, there are no studies describing Brazilian thalassemic children. We evaluated eleven patients with beta thalassemia major (median age of 10.0 years, range from 5 to 12 years) and twenty-four healthy children (median age of 9.5 years, range from 6 to 12 years), using dual X-ray absorptiometry to assess bone mineral density (BMD). Analysis of biochemical markers such as serum ferritin concentration, ionized calcium, alkaline phosphatase, phosphorus, albumin, prothrombin time and factor V was performed. The height was very differentbetween the groups, p<0.05. The thalassemic patients showed significantly lower BMD (median 0.61g/cm2) than control subjects (median 0.69 g/cm2) – p < 0.05. The relevant bone loss in the majority of thalassemic children studied emphasizes the need for identification and appropriate treatment of osteopenia, thereby reducing the morbidity of these patients. This is the first study described in the literature that determined bone mineral loss in Brazilian thalassemic children.

Isolated trisomy 11 in de novo acute myeloid leukemia / Trissomia 11 isolada em leucemia mielóide aguda de novo

The real mechanism involved in trisomies and leukemogenesis remains unknown and more information about this connection is essential, but unfortunately the clinical outcome and hematological profile of patients with isolated trisomy 11 and AML have not been well characterized. Considering the limited data on the specific disease entity, the current report describes two cases of de novo acute monocytic leukemia (AMoL) and isolated +11, in which this event was further characterized.

O mecanismo envolvido em trissomias e leucemogênese permanece não esclarecido e mais dados sobre esta relação são fundamentais, mas infelizmente os resultados clínicos e o perfil hematológico dos pacientes com trissomia 11 isolada e LMA ainda não foram bem caracterizados. Considerando o limitado número de informações, este relato descreve dois casos de leucemia monocítica de novo e trissomia 11 onde este evento foi caracterizado.

Elevada incidência de anormalidades cromossômicas numéricas detectadas por FISH multicentromérico em pacientes com mieloma múltiplo / High incidence of chromosomal numerical abnormalities by multicentromeric FISH in multiple myeloma patients

Este estudo objetivou detectar as alterações genéticas em pacientes com mieloma múltiplo (MM), usando o método de hibridação in situ por fluorescência em interfases (FISH interfásico). Para detectar as alterações numéricas foram usadas sondas multicentroméricas e para os rearranjos mais freqüentemente observados na doença foram utilizadas as sondas lócus específicas para IGH, P53, ciclina D1 e RB1. Foram estudados 34 pacientes com MM em estágio avançado, ainda que recém-diagnosticados, 97 por cento dos quais apresentaram anormalidades numéricas detectadas por FISH, sendo 75 por cento hiperdiplóides, 18 por cento hipodiplóides e 3 por cento tri/tetraplóides. Em relação às demais anormalidades, a deleção 13q foi encontrada em 30 por cento dos casos e o rearranjo IGH, em 25 por cento. Agrupando os pacientes com hipodiploidia e com deleção 13q14 (grupo desfavorável) e comparando-os com os demais (grupo não-desfavorável), houve tendência a pacientes jovens no grupo desfavorável (p = 0,06) e níveis de hemoglobina (Hb) significativamente mais baixos (< 8,5 g/dl, p = 0,03).

This study aimed to characterize genetic alterations by interphase multicentromeric FISH focusing on chromosomal numerical abnormalities and using some locus specific probes for the most frequent aberrations found in the disease, in a homogeneous cohort of 34 advanced stage, but recently diagnosed MM patients; 97 percent had numerical chromosomal abnormalities detected by FISH, being 75 percent hyperdiploid, 18 percent hypodiploid and 3 percent tri/tetraploid. Using locus specific probes, we found 13q deletion in 30 percent and IGH rearrangement in 25 percent of cases. Grouping hypodiploid patients together with del13q (unfavorable group) and comparing them to the remaining cases (non unfavorable group) we found a trend towards younger patients presenting more unfavorable abnormalities (p = 0.06) and significant lower hemoglobin level (Hb < 8.5 mg/dl, p = 0.03).

Epidemiologia da leucemia linfocítica crônica e leucemia linfocítica crônica familiar / Epidemiology of chronic lymphocytic leukemia and familial chronic lymphocytic leukemia

A leucemia linfocítica crônica (LLC) é uma doença linfoproliferativa crônica (DLPC) que apresenta características epidemiológicas peculiares; acomete indivíduos com idade mais avançada (não ocorre em crianças e é rara abaixo dos 30 anos) e a sua incidência varia conforme a origem étnica dos pacientes. É a leucemia mais freqüente nos países ocidentais enquanto muito rara nos orientais. A sua etiologia não está ainda esclarecida, não se conhecendo fatores ambientais que mostrem forte associação com o surgimento da doença. Não tem relação com radiação ionizante (sobreviventes da bomba atômica não apresentaram aumento na incidência da LLC), assim como não foi demonstrada associação com agentes tóxicos ou virais específicos. A LLC familiar é assim denominada quando, pelo menos, dois membros de uma família apresentam LLC e o diagnóstico nestes pacientes costuma ocorrer em idade mais precoce. A ocorrência é maior em parentes de primeiro grau (irmãos, filhos), podendo, porém, afetar parentes mais distantes. Os familiares de pacientes com LLC apresentam maior freqüência de outras DLPC (risco relativo 30x maior) e de proliferação monoclonal de linfócitos B (13 por cento-18 por cento) e parece que o HLADR1.11 está implicado na LLC familiar, pelo menos em algumas populações.

Chronic lymphocytic leukemia (CLL) is a chronic lympho-proliferative desorder (CLPD) with peculiar epidemiologic characteristics. It is a disease of the elderly, which is very rare in under 30-year-old individuals and absent among children. Its incidence largely varies according to the ethnical origin: CLL is the most common leukemia in Western countries while it is rarely seen in Eastern countries. The etiology of CLL is still unknown. Environmental factors such as exposure to ionizing radiation (atomic bomb survivors did not show an increased incidence of CLL) or toxic or viral agents are not associated to the occurrence of CLL. Familiar CLL is characterized when at least two members of the same family develop CLL The diagnosis of familiar CLL seems to be made 10 to 20 years earlier than sporadic cases. CLL occurs more frequently among siblings and offspring although it may appear in other members such as cousins. The frequency of other CLPD (relative risk is 30 times greater) and monoclonal CD5+B cells proliferations (13.5 percent-18 percent) are higher among "healthy" members of familial CLL and HLADR1/11 is implicated in at least some populations with familial CLL.