We report on the emergence and clinical relevance of an unusual BCR-ABL1 kinase domain mutational status in a 2-year-old female with p210-BCR-ABL Philadelphia chromosome-positive acute lymphoblastic leukaemia. We detected three BCR-ABL1 clones determined by the presence of the E255V, D276G and F317L mutations. We point out the usefulness of searching for mutated populations that survive tyrosine-kinase inhibitor therapy and the role of their clonal selection over time in relation to therapeutic intervention.
© 2015 S. Karger AG, Basel
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