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Jumping translocations in myeloid malignancies associated with treatment resistance and poor survival #MMPMID26141213
Clin Lymphoma Myeloma Leuk 2015[Sep]; 15 (9): 556-62 PMID26141213show ga
Background: Jumping translocations (JT) are uncommon cytogenetic abnormalities involving non-reciprocal translocations of a single donor chromosome onto two or more chromosomes. The clinical characteristics and prognosis of JTs in patients with myeloid malignancies are not well described. Materials and Methods: We searched our cytogenetic database from 2003 to 2014 to identify cases of myeloid malignancies associated with a JT. These cases were cross-referenced with our clinical databases to determine patient characteristics, response to treatment and overall survival. Results: We identified 10 patients with myeloid malignancies and a JT: 4 cases of acute myeloid leukemia (AML) with MDS-related changes, 4 cases of myelodysplastic syndrome (MDS) and 2 cases of post-polycythemia myelofibrosis. The donor segment was derived from chromosome 1 in every case. The acquisition of a JT was a late ocurrence, with a median time to JT development of 24.9 months (range 0-248 months) from diagnosis. The overall response to treatment was poor, with no patients achieving a response to conventional chemotherapy or hypomethylating agents. The median overall survival for the group was 9 months (95% CI 2.5-15.5) after identification of a JT. Conclusion: The acquisition of a JT in patients with myeloid malignancies appears to be a late event and is associated with myelodysplasia. In our series, this was associated with a poor prognosis with patients having a poor response to treatment, disease transformation to AML and short overall survival.