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Am J Hematol. 2005 Mar;78(3):173-80.

Expression of IAP-family proteins in adult acute mixed lineage leukemia (AMLL).

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Department of Comprehensive Pathology, Aging and Developmental Sciences, Tokyo Medical and Dental University, Graduate School, Tokyo, Japan.


Inhibitor of apoptosis protein (IAP)-family proteins suppress apoptotic signaling in normal/neoplastic cells in various settings. To determine the apoptosis-resistant mechanism in adult acute mixed lineage leukemia (AMLL) with biphenotypic blasts responsible for resistance against chemotherapy, the expression levels of IAP-family proteins in AMLL bone marrow cells were analyzed by quantitative RT-PCR. The overall expression levels of IAPs were higher than those in control, AML, and ALL cells. A significant difference for the expression of survivin was observed between AMLL and AML (P <0.05), and differences between AMLL and ALL were significant for the expression of survivin (P <0.05), NAIP (P <0.05), and XIAP (P <0.05). These findings suggest that higher expression of various IAPs is associated with the chemotherapy-resistant nature of this specific type of leukemia.

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