Abstract
A patient with t(9;22)-positive chronic myelogenous leukemia (CML) developed a resistance to therapy with imatinib mesylate (Glivec) which coincided with the appearance of t(5;6;12) in the same cells with t(9;22) [46,XX,t(5;6;12)(q14?;q21?;q23?),t(9;22)(q34;q11)]. She remains in a continuous chronic phase of CML. This is the first reported instance of karyotype evolution temporally associated, and possibly involved, with the induction of resistance to imatinib mesylate but without any signs of evolution of leukemia toward a more anaplastic and aggressive form.
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