Abstract
We describe a patient with acute promyelocytic leukemia (APL) carrying a new complex variant translocation of t(2;15;17)(q21;q22;q21). The karyotypic interpretation was confirmed by fluorescence in situ hybridization (FISH) with the use of painting probes of chromosomes 2, 15, and 17 and a PML/RARA dual color DNA probe. FISH showed a PML/RARA fusion gene on the der(2) instead of the der(15). These results suggest that the critical event in the development of APL is the formation of a PML/RARA chimeric gene, regardless of its locus in the genome.
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