The detection and significance of chromosomal abnormalities in childhood acute lymphoblastic leukaemia

Blood Reviews
C J Harrison

Abstract

In childhood acute lymphoblastic leukaemia (ALL), cytogenetics plays an essential role in diagnosis and prediction of outcome. Conventional cytogenetic analysis, complemented by fluorescence in situ hybridization (FISH), is highly effective in the accurate detection of chromosomal abnormalities. For the precise identification of specific genetic changes, molecular techniques may be applied. Chromosomal changes in ALL may be of structural or numerical type. A large number of established structural chromosomal rearrangements have now been described for which the genetic alterations and effect on prognosis are well known. These include t(9;22)(q34;q11) and BCR/ABL, rearrangements of 11q23 involving MLL, t(12;21)(p13;q22) with the ETV6/AML1 fusion, t(1;19)(q23;p13) with E2A/PBX1, t(8;14)(q24;q32) and the immunoglobulin genes. Genetic changes associated with T ALL are also known, although their effect on outcome is less pronounced. Rare chromosomal abnormalities are continually being discovered in small patient subgroups leading to the identification of new ALL associated genetic changes. Alterations in chromosome number have a strong impact on outcome in childhood ALL. The association of a high hyperdiploid karyotype (51-65 chromos...Continue Reading

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