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Background:  FLT3 gene mutation contributes worse prognosis in patients with acute myeloid leukemia (AML). Almost 67% of patients with AML with FLT3 gene mutation cannot reach complete remission after induction therapy, and  they are also at high risk of  relapse. We aimed to investigate the FLT3-ITD, -TKD (D835) gene mutation prevalence in patients with AML at Surabaya and their association with leukocyte and bone marrow blast cell count.
Methods: 20 de novo patients with AML were recruited during February–July 2018. They were investigated through routine AML check-up and detection for FLT3-ITD, -TKD (D835) gene mutation. 
Results:  Four patients with de novo AML (20%) had FLT3-ITD gene mutation, and one  patient had  FLT3-TKD (D835) gene mutation. Median leukocyte count in patients with AML with FLT3-ITD mutation was higher than wild type patients ( 146.3×103/ µL vs 16.4 x 103 / µL, P=0,002). The mean bone marrow blast cell count was higher in patients with AML with FLT3-ITD mutation than wild type patients ( 86.5% vs 57.9%, P=0,047).  The difference in leukocyte and bone marrow blast cell count in patients with FLT3-TKD (D835) mutation could not be analyzed since there was only one patient with this mutation. 
Conclusion: The prevalence of FLT3-ITD gene mutation in patients in AML in Surabaya was 20% and FLT3-TKD (D835) was 5%. Patients with FLT3-ITD gene mutation was associated with leukocyte and bone marrow blast cell count. 

Keywords: Acute myeloid leukemia, Leukocyte, Blast count, FLT3-ITD, FLT3-TKD (D835)

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