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Complex Variant t(9;22) Chromosome Translocations in Five Cases of Chronic Myeloid Leukemia

2009; Hindawi Publishing Corporation; Volume: 2009; Linguagem: Inglês

10.1155/2009/187125

1687-9112

Ana Valencia, José Cervera, Esperanza Such, Eva Barragán, Pascual Bolufer, Óscar Fuster, Rosa Collado, Jesús Martı́nez, Miguel Á. Sanz,

Acute Myeloid Leukemia Research

The Philadelphia (Ph(1)) chromosome arising from the reciprocal t(9;22) translocation is found in more than 90% of chronic myeloid leukemia (CML) patients and results in the formation of the chimeric fusion gene BCR-ABL. However, a small proportion of patients with CML have simple or complex variants of this translocation, involving various breakpoints in addition to 9q34 and 22q11. We report five CML cases carrying variant Ph translocations involving both chromosomes 9 and 22 as well as chromosomes 3, 5, 7, 8, or 10. G-banding showed a reciprocal three-way translocation involving 3q21, 5q31, 7q32, 8q24, and 10q22 bands. BCR-ABL fusion signal on der(22) was found in all of the cases by FISH.