Diagnosis of chronic lymphoproliferative disorders by flow cytometry using four-color combinations for immunophenotyping: A proposal of the brazilian group of flow cytometry (GBCFLUX).

BACKGROUND: Multiparametric flow cytometry (MFC) is a powerful tool for the diagnosis of hematological malignancies and has been useful for the classification of chronic lymphoproliferative disorders (CLPD) according to the WHO criteria. Following the purposes of the Brazilian Group of Flow Cytometry (GBCFLUX), the aim of this report was to standardize the minimum requirements to achieve an accurate diagnosis in CLPDs, considering the different economic possibilities of the laboratories in our country. Most laboratories in Brazil work with 4-fluorescence flow cytometers, which is why the GBCFLUX CLPD Committee has proposed 4-color monoclonal antibody (MoAb) panels. METHODS/RESULTS: Panels for screening and diagnosis in B, T and NK lymphoproliferative disorders were developed based on the normal differentiation pathways of these cells and the most frequent phenotypic aberrations. Important markers for prognosis and for minimal residual disease (MRD) evaluation were also included. The MoAb panels presented here were designed based on the diagnostic expertise of the participating laboratories and an extensive literature review. CONCLUSION: The 4-color panels presented to aid in the diagnosis of lymphoproliferative neoplasms by GBCFLUX aim to provide clinical laboratories with a systematic, step-wise, cost-effective, and reproducible approach to obtain an accurate immunophenotypic diagnosis of the most frequent of these disorders. © 2016 International Clinical Cytometry Society.

Viabilidade celular de linfócitos como auxiliar na instituição da terapia antirretroviral na infecção pelo HIV-1 / Cellular viability of lymphocytes as an auxiliary for the institution of antiretroviral therapy in the human immunodeficiency virus infection

A infecção pelo vírus da imunodeficência humana (HIV) está associada à diminuição progressiva do número de linfócitos T CD4. Além do comprometimento na produção das células T CD4, os altos níveis de apoptose verificados nesses pacientes também são responsáveis pela depleção dessas células. O objetivo deste trabalho foi mostrar a importância da avaliação da viabilidade celular de linfócitos como auxiliar no monitoramento da infecção pelo HIV. Participaram deste estudo 18 voluntários HIV soropositivos com contagem de linfócitos CD4 ≤ 200 células/mm3 e 14 voluntários HIV soropositivos com contagem de linfócitos CD4 ≥ 200 células/mm3. O ensaio de viabilidade celular foi realizado em citômetro de fluxo, modelo FACScalliburTM. A avaliação da viabilidade celular demonstrou níveis elevados de apoptose nos pacientes HIV soropositivos com contagem de linfócitos CD4 ≤ 200 células/mm3 (64,21± 15,26), assim como nos pacientes HIV soropositivos com contagem de linfócitos CD4 ≥ 200 células/mm3 (62,63...