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Case Reports in Genetics
Volume 2014 (2014), Article ID 691630, 4 pages
http://dx.doi.org/10.1155/2014/691630
Case Report

Complex Variant of Philadelphia Translocation Involving Chromosomes 9, 12, and 22 in a Case with Chronic Myeloid Leukaemia

1Research and Development, Cytogenetics and Molecular Biology, TOMA Advanced Biomedical Assays S.p.A., 25/27 Francesco Ferrer Street, 21052 Busto Arsizio, Varese, Italy
2Treviglio Caravaggio Hospital, 1 Pittori Cavenaghi Square, 24043 Caravaggio, Bergamo, Italy

Received 20 March 2014; Accepted 27 May 2014; Published 18 June 2014

Academic Editor: Gopalrao Velagaleti

Copyright © 2014 F. Malvestiti et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Chronic myeloid leukemia (CML) is a hematopoietic stem cell disorder included in the broader diagnostic category of myeloproliferative neoplasms, associated with fusion by BCR gene at chromosome 22q11 to ABL1 gene at chromosome 9q34 with the formation of the Philadelphia (Ph) chromosome. In 2–10% of CML cases, the fusion gene arises in connection with a variant translocation, involving chromosomes 9, 22, and one or more different chromosomes; consequently, the Ph chromosome could be masked within a complex chromosome rearrangement. In cases with variant Ph translocation a deletion on der(9) may be more frequently observed than in cases with the classical one. Herein we describe a novel case of CML with complex variant Ph translocation involving chromosomes 9, 12, and 22. We present the hematologic response and cytogenetic response after Imatinib treatment. We also speculated the mechanism which had originated the chromosome rearrangement.