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Acute Lymphoblastic Leukemia

Deletions on der(9) chromosome in adult Ph-positive acute lymphoblastic leukemia occur with a frequency similar to that observed in chronic myeloid leukemia

Abstract

The t(9;22)(q34;q11), generating the Philadelphia chromosome (Ph), is found in more than 90% of patients with chronic myeloid leukemia (CML) and in 15–30% of adults with acute lymphoblastic leukemia (ALL). Different groups have recently described the presence of large genomic deletions adjacent to the translocation breakpoint on the derivative chromosome 9 in 9–16% of CML patients. In the present paper, we report a FISH study of 45 Ph+ adult ALL patients with the aim of investigating the presence of deletions on derivative chromosome 9. In four (9%) of 45 cases, all showing an M-bcr, we detected deletions on der(9). The frequency of deletions we observed is similar to that reported in CML patients. The association of an M-bcr breakpoint and deletions appears significant (P=0.03). Some authors have suggested a very low incidence of der(9) deletions in ALL. This discrepancy can be explained by taking into account the low percentage of M-bcr ALL patients in the latter study (18%) compared to the present one (44%).

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Acknowledgements

The financial support of Associazione Italiana per Ricerca contro il Cancro (AIRC), CEGBA, MIUR (Ministero Istruzione Università e Ricerca), CNR (Centro Nazionale della Ricerca), and FIRB-MIUR (Fondo Investimento Ricerca Biologica) is gratefully acknowledged.

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Specchia, G., Albano, F., Anelli, L. et al. Deletions on der(9) chromosome in adult Ph-positive acute lymphoblastic leukemia occur with a frequency similar to that observed in chronic myeloid leukemia. Leukemia 17, 528–531 (2003). https://doi.org/10.1038/sj.leu.2402829

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