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Related Collections Neoplasia Oncogenes and Tumor Suppressors Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 1 August 2002, Vol. 100, No. 3, pp. 1014-1018 NEOPLASIA Several types of mutations of the Abl gene can be found in chronic myeloid leukemia patients resistant to STI571, and they can pre-exist to the onset of treatment Catherine Roche-Lestienne, Valerie Soenen-Cornu, Nathalie Grardel-Duflos, Jean-Luc Laï, Nathalie Philippe, Thierry Facon, Pierre Fenaux, and Claude Preudhomme From the Unité Inserm U524, Lille; Laboratoire d'Hématologie A, CHRU, Lille; Laboratoire de Cytogénétique, CHRU, Lille; Service des Maladies du Sang, CHRU, Lille, France. Targeting the tyrosine kinase activity of BCR-ABL represents a very promising therapeutic strategy in chronic myeloid leukemia (CML). Despite strong efficacy of the tyrosine kinase inhibitor STI571, resistance has been observed in a significant proportion of patients in advanced CML stage or in Ph-positive acute lymphoid leukemia (ALL). We investigated in this study the mechanism of resistance to STI571 through point mutations in the tyrosine kinase domain and/or BCR-ABL gene amplification in 24 patients (16 in chronic phase and 8 in accelerated phase of the disease) who obtained no cytogenetic response to STI571 treatment. Screening for the already-described Thr315Ile point mutation in the ABL domain using a reverse transcription polymerase chain reaction restriction fragment length polymorphism (RT-PCR-RFLP) technique, 3 patients showed a proportion of mutated transcript at the time of resistance. The same technique failed to detect mutation at diagnosis, but a specific allele-specific oligonucleotide (ASO)-PCR on DNA for the Thr315Ile mutation and, after sequencing, for 2 newly described Phe311Leu and Met351Thr substitutions, showed the presence of rare mutated cells prior to STI571 therapy. Furthermore, the increased proportion of mutated cells during treatment detected by ASO-PCR strongly suggested clonal selection by the functional inhibiting effect of these mutations. Finally, no BCR-ABL gene amplification was detected by fluorescent in situ hybridization (FISH) in the 24 STI571-resistant patients. Our data support that in CML patients treated with STI571, ABL mutations are not restricted to the accelerated phase of the disease and that, at least in some cases, mutations seem to occur prior to STI571 therapy, probably as second mutational events during the course of CML. © 2002 by The American Society of Hematology.   CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: T. Ernst, F. X. Gruber, O. Pelz-Ackermann, J. Maier, M. Pfirrmann, M. C. Muller, I. Mikkola, K. Porkka, D. Niederwieser, A. Hochhaus, et al. A co-operative evaluation of different methods of detecting BCR-ABL kinase domain mutations in patients with chronic myeloid leukemia on second-line dasatinib or nilotinib therapy after failure of imatinib Haematologica, September 1, 2009; 94(9): 1227 - 1235. [Abstract] [Full Text] [PDF] D. H. Mak, W. D. Schober, W. Chen, M. Konopleva, J. Cortes, H. M. Kantarjian, M. Andreeff, and B. Z. 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