Molecular alterations in IDH 1/2 genes among Iraqi adult acute myeloid leukemia patients: Their response to treatment

Abstract

BACKGROUND: The recurrent somatic variations in IDH1/2 genes in AML play imperative roles in epigenetic dysregulation and the pathogenesis of AML, which could be useful prognostic markers for risk stratification. AIM: The aim of the study was to detect the frequency of R132 mutations in the IDH1 gene and R140Q mutation in the IDH2 gene with their treatment outcomes. PATIENTS, MATERIALS AND METHODS: IDH molecular alterations were detected by high-resolution-melting (HRM)-based real-time PCR assay in 56 newly diagnosed AML patients. RESULTS: IDH molecular alterations were identified in 39.3% of AML patients; IDH1 R132 and IDH2 R140Q mutations were present in 32.1% and 12.5% of patients, respectively. The mean age of patients with mutant IDH (52±14.87 years) is higher than in wild type (41.68±20.4 years), P = 0.041. Females were seen in 53% of mutant IDH patients while in the wild-type 73.3% were males (P = 0.038). There were significantly lower mean levels of hemoglobin, absolute neutrophil count, and platelet count in mutant IDH than in wild-type (P = 0.015, 0,.03 and 0.01, respectively). After induction remission therapy, 68.2% of mutated IDH and 64.7% of unmutated IDH patients didn't achieve complete remission (P > 0.05). After 6 months; 59.1% of mutated IDH and 64.7% of unmutated IDH had unfavorable outcomes (P > 0.05). CONCLUSIONS: IDH mutations are common in Iraqi adult AML patients and present in older age and females predominance with lower Hb level, WBC count, absolute neutrophil count, platelet count, and less extramedullary involvement. There is an insignificant association with treatment outcomes.

Keywords

• acute myeloid leukemia
• high-resolution-melting-polymerase chain reaction
• idh1/2