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Prepublished online as a Blood First Edition Paper on March 27, 2003; DOI 10.1182/blood-2002-06-1756.
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Blood, 15 July 2003, Vol. 102, No. 2, pp. 659-661
NEOPLASIA
Brief report
Presence of the BCR-ABL mutation Glu255Lys prior to STI571 (imatinib) treatment in patients with Ph+ acute lymphoblastic leukemia
Wolf-Karsten Hofmann,
Martina Komor,
Barbara Wassmann,
Letetia C. Jones,
Harald Gschaidmeier,
Dieter Hoelzer,
H. Phillip Koeffler, and
Oliver G. Ottmann
From the Department of Hematology, University Hospital, Frankfurt/Main, Germany; the Division of Hematology/Oncology, Cedars Sinai Research Institute, University of California Los Angeles (UCLA) School of Medicine, CA; and Novartis Pharma AG, Nuremberg, Germany
The tyrosine kinase inhibitor STI571 (imatinib) binds competitively to the adenosine triphosphate (ATP) binding site of the ABL kinase, thereby inhibiting auto- and substrate phosphorylation of the oncogenic protein BCR-ABL and preventing the activation of downstream signaling pathways. Comparative studies on leukemic cell samples obtained from chronic myelogenous leukemia (CML) and Philadelphia chromosome–positive (Ph+) acute lymphoblastic leukemia (ALL) patients before and after treatment with STI571 reported point mutations in resistant samples after a short time of therapy. The aim of this study was to determine whether patients with Ph+ ALL in whom resistance developed as a consequence of the Glu255Lys mutation already harbored this subclone prior to STI571 treatment. First, the migration pattern of cDNAs from 30 bone marrow samples from patients with Ph+ ALL was analyzed by polymerase chain reaction–single strand conformation polymorphism (PCR-SSCP). Thereafter, detailed mutational analysis using genomic DNA was performed on initial STI571-naive bone marrow samples of 4 individuals with Ph+ ALL, for whom the mutation Glu255Lys in association with STI571 treatment had been shown. A 166-bp PCR fragment spanning from nucleotide (nt) 862 to nt 1027 was cloned, and 108 clones per sample were analyzed by direct sequencing. This more sensitive technique revealed the presence of the Glu255Lys mutation in 2 initial samples, one clone each. We identified for the first time the mutation Glu255Lys in STI571-naive leukemic samples of Ph+ ALL patients. The findings suggest that the mutation exists in a very small subpopulation of leukemic cells at the beginning of STI571 therapy.
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