title: A new t(9;11;20;22)(q34;p11.2;q11.21;q11) in a Philadelphia-positive chronic myeloid leukemia case.
abstract: The so-called Philadelphia (Ph) chromosome is found in over 90% of cases of chronic myeloid leukemia (CML). Of these cases, 2-10% demonstrate complex translocations involving a third chromosome in addition to chromosomes 9 and 22. Since the majority of CML cases are currently treated with imatinib, variant rearrangements tend to have no specific prognostic significance, although the mechanisms involved in resistance to therapy have yet to be investigated. This study evaluated a CML case with complex chromosomal aberrations not previously observed. A four-chromosome translocation involving chromosomal regions including 11p11.2 and 20q11.21 in addition to 9q34 and 22q11 was characterized in detail using array-proven multicolor banding (aMCB), a technique which has proven to be of significance in characterizing breakpoint regions in detail. Underlying mechanisms and prognostic factors are discussed.
authors: Department of Molecular Biology and Biotechnology, Human Genetics Division, Atomic Energy Commission, Damascus,  Syria ;
authors: Walid
authors: W
authors: Al-Achkar
authors: Abdulsamad
authors: A
authors: Wafa
authors: Thomas
authors: T
authors: Liehr
keywords: KAI1; KIF3B; chronic myeloid leukemia; fluorescence in situ hybridization; high-resolution array-proven multicolor banding; imatinib mesylate; variant Philadelphia chromosome