Navegando por Palavras-chave "trissomia 12"

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    Citogenética e biologia molecular em leucemia linfocítica crônica
    (Associação Brasileira de Hematologia e Hemoterapia e Terapia Celular, 2005-12-01) Chauffaille, Maria de Lourdes Lopes Ferrari [UNIFESP]; Universidade Federal de São Paulo (UNIFESP); Fleury Centro de Medicina Diagnóstica
    The analysis of chromosomal abnormalities in chronic lymphocytic leukemia is important at diagnosis, since it allows the identification of a malignant clone as well as helping in the differentiation of other lymphoproliferative disorders; at follow up, in order to permit the detection of additional abnormalities; in the therapeutic decision, since the presence of del(17p) means resistance to treatment; in treatment monitoring as it allows the detection of residual disease or the diagnosis of transformation (Richter s transformation). Cytogenetics offers prognostic information and a better understanding of the disease. The analysis can be made by conventional G banding karyotyping, which detects around one third of abnormal cases or by FISH, which increases the rate of abnormality detection to 82%. FISH together with other prognostic criteria (mutation status, ZAP-70, etc) has allowed a better prognostication. The most frequent abnormalities are: trisomy 12 (+12), with a median survival of 9 years; translocation or deletion of 13q (t/del(13q)) with favorable prognosis and median survival of 11 years; deletion or translocation of 11q22-23, with 6.6 years of median survival; deletion of short arm of chromosome 17, del(17p), with median survival of 2.5 years; and deletion of 6q, translocation of 14q, giving a total of around 60% of the total abnormalities. Considering the importance of cytogenetics and prognostic information, every chronic lymphocytic leukemia patient should undergo FISH and karyotype evaluations, at diagnosis and during the follow up.