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HLA-DR-negative AML (M1 and M2): FLT3 mutations (ITD and D835) and cell-surface antigen expression
Meilani Syampurnawati1, Eiji Tatsumi, Kaho Furuta
1International Center for Medical Research and Treatment (ICMRT), Graduate School of Medicine, Kobe University, Chuo-Ku, Kobe 650-0017, Japan.
Abstract:
FLT3 mutations and cell-surface antigen were investigated in 29 DR-negative (DR(-)) M1/M2 AML samples in comparison with 30 DR-positive (DR(+)) M1/M2 AML samples. FLT3-ITD was detected in 59.3% and D835 was detected in 7.4% of the samples. The incidence of FLT3-ITD was higher in the DR(-) group (59.3%) than in the DR(+) group (17.9%; P=0.002). The DR(-) status was associated with the CD34(-) (82.8%), CD7(-) (92.9%) and CD45RO(+) status (76%). Our results indicated that FLT3 mutation is the most common gene alteration found in the DR(-) M1/M2 AML. These results are important for further characterizing this phenotypic AML entity.
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