Navegando por Assunto "Imunofenotipagem"

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Acesso aberto (Open Access)
Diagnóstico de imunofenótipos de síndromes linfoproliferativas crônicas por citometria de fluxo na Fundação HEMOPA
(2011-12) BRITO JUNIOR, Lacy Cardoso de; FEIO, Danielle Cristinne Azevedo; BARBOSA, Suane Reis; BENTES, Alessandra Quinto; FRANCÊS, Larissa Tatiane Martins
INTRODUCTION: Lymphoproliferative syndromes comprise a heterogeneous group of malignant neoplasias with different clinical behaviors, pathological factors and epidemiological characteristics, whose diagnosis may be based on lymphoid cell morphology observed in peripheral blood. OBJECTIVE: To test the diagnostic feasibility of immunophenotyping by flow cytometry for lymphoproliferative syndromes through the definition of minimal antibody panel. MATERIAL AND METHODS: During the period of July 2008 to July 2010, 47 patients from HEMOPA blood center participated in this study for differential diagnosis of lymphoproliferative syndromes subtypes by flow cytometry. RESULTS: The mean age was 68 years old. There was no statistical difference between genders, and the most frequent subtype of lymphoproliferative syndromes was chronic lymphoid leukemia/small B-cell lymphocytic lymphoma. CONCLUSION: Based on the antibody panel recommended in this investigation, the immunophenotyping method by flow cytometry associated with morphological characterization of peripheral blood samples is a reliable, rapid, feasible, and non-invasive procedure for the diagnosis of chronic lymphoproliferative syndromes.
Acesso aberto (Open Access)
Frequency of paroxysmal nocturnal hemoglobinuria in patients attended in Belém, Pará, Brazil
(2011-02) BRITO JUNIOR, Lacy Cardoso de; CARDOSO, Maria do Socorro de Oliveira; ROCHA, Euzamar Gaby; ANIJAR, Herika; CUNHA, Mariana; SARAIVA, João Carlos Pina
Paroxysmal nocturnal hemoglobinuria is a hematological disease with complex physiopathology. It is genetically characterized by a somatic mutation in the PIG-A gene (phosphatidylinositol glycan anchor biosynthesis, class A), in which the best known antigens are DAF (decay accelerating factor or CD55) and MIRL (membrane inhibitor of reactive lysis or CD59). OBJECTIVE: To determine the frequency of paroxysmal nocturnal hemoglobinuria in patients attended at the HEMOPA foundation from November 2008 to July 2009. METHOD: Thirty patients, with ages ranging from two to 79 years old and suspected of having paroxysmal nocturnal hemoglobinuria were examined. All patients were immunophenotyped by flow cytometry for the CD5, CD59, CD16 and CD45 antigens. RESULTS: Paroxysmal nocturnal hemoglobinuria was identified in nine of the thirty patients investigated. Another 3 cases had inconclusive results with CD59-negative labeling only for neutrophils. The highest frequency of paroxysmal nocturnal hemoglobinuria patients (7/9) and inconclusive cases (2/3) were between 19 years old and 48 years old, with a median of 28 years. CONCLUSION: These results show the importance of flow cytometry to identify cases in which patients are deficient in only one antigen (CD59).
Acesso aberto (Open Access)
Relato de caso de leucemia de células pilosas
(2011-12) BRITO JUNIOR, Lacy Cardoso de; BARBOSA, Suane Reis; FRANCÊS, Larissa Tatiane Martins
Hairy cell leukemia (HCL) is a rare type of B-cell non-Hodgkin's lymphoma. The clinical symptoms include splenomegaly, pancytopenia, and lymphocytosis. Studies on its carcinogenesis reveal association with exposure to agricultural chemical agents. The objective of this study was to report the case of a male patient, tractor operator, diagnosed with HCL, pancytopenia, cutaneous lesions, without splenomegaly and positive markers for B-cell lymphocytes (CD19, CD20, CD22, CD79b, CD23, Lambda, immunoglobulin M [IgM], CD25 and CD103). Although HCL is a rare disease, late diagnosis may ultimately lead to severe complications and patient's death.