Abstract
Two different complex translocations from newly diagnosed cases of Philadelphia chromosome-positive chronic myelogenous leukemia (CML) were characterized by G-banding and fluorescence in situ hybridization (FISH) analysis. In one case, a unique balanced t(9;22;9;11)(q34;q11;p22;q23) was identified by G-banding, and confirmed by FISH using MBCR/ABL and painting probes. In the second case, an apparently balanced t(19;22) was identified by G-banding analysis. FISH using MBCR/ABL probe detected the fusion gene on the derivative chromosome 22, indicating the involvement of chromosome 9. Further FISH analysis with selected painting probes showed that the t(19;22) was a result of a complex translocation involving chromosomes 9, 19, 21, and 22.
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