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Expression Levels of Human Equilibrative Nucleoside Transporter 1 and Deoxycytidine Kinase Enzyme as Prognostic Factors in Patients with Acute Myeloid Leukemia Treated with Cytarabine.

BACKGROUND: Cytarabine (Ara-C) is the primary drug in different treatment schemas for acute myeloid leukemia (AML) and requires the human equilibrative nucleoside transporter (hENT1) to enter cells. The deoxycytidine kinase (dCK) enzyme limits its activation rate. Therefore, decreased expression levels of these genes may influence the response rate to this drug.

METHODS: AML patients without previous treatment were enrolled. The expression of hENT1 and dCK genes was analyzed using RT-PCR. Clinical parameters were registered. All patients received Ara-C + doxorubicin as an induction regimen (7 + 3 schema). Descriptive statistics were used to analyze data. Uni- and multivariate analyses were performed to determine factors that influenced response and survival.

RESULTS: Twenty-eight patients were included from January 2011 until December 2012. Median age was 36.5 years. All patients had an adequate performance status (43% with ECOG 1 and 57% with ECOG 2). Cytogenetic risk was considered unfavorable in 54% of the patients. Complete response was achieved in 53.8%. Cox regression analysis showed that a higher hENT1 expression level was the only factor that influenced response and survival.

CONCLUSIONS: These results highly suggest that the pharmacogenetic analyses of Ara-C influx may be decisive in AML patients.

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