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Late appearance of a Philadelphia chromosome in a patient with therapy-related acute myeloid leukemia and high expression of EVI1

Late appearance of a Philadelphia chromosome in a patient with therapy-related acute myeloid leukemia and high expression of EVI1,10.1016/j.cancergenc

Late appearance of a Philadelphia chromosome in a patient with therapy-related acute myeloid leukemia and high expression of EVI1   (Citations: 2)
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A 17-year-old boy developed therapy-related acute myeloid leukemia (t-AML) 3 years after the cessation of chemo- and radiotherapy for undifferentiated sarcoma of the liver. At the onset of the t-AML, his white blood cell count was 900/μL with a 46,XY,t(2;3)(p21;q26),del(5)(q?) karyotype. Despite intensive chemotherapy and two hematopoietic stem cell transplants, he died of the leukemia. At the terminal phase, his white blood cell count surpassed 30,000/μL and the Philadelphia (Ph) chromosome appeared. Expression of EVI1 in bone marrow cells was remarkably high at the onset of t-AML, although it was not detected at the end of therapy for the sarcoma. Polymerase chain reaction analysis of bone marrow cells revealed that mRNA for the bcr-abl chimera was negative at the onset of t-AML and positive at the terminal phase. These results suggest that EVI1 overexpression was the major factor contributing to leukemogenesis, and the late appearance of the Ph chromosome is closely associated with the progression to an aggressive form of leukemia.
Journal: Cancer Genetics and Cytogenetics - CANCER GENET CYTOGENET , vol. 180, no. 2, pp. 115-120, 2008
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