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The association of glutathione S-transferase gene mutations (including GSTT1 and GSTM1) with the prognostic factors and relapse in acute lymphoblastic leukemia

The association of glutathione S-transferase gene mutations (including GSTT1 and GSTM1) with the prognostic factors and relapse in acute lymphoblastic leukemia

Pediatric Hematology and Oncology 30(6): 568-573

Acute lymphoblastic leukemia (ALL) is the most common malignancy in children. It accounts for one fourth of all childhood cancers and approximately 75% of all childhood leukemias. Some prognostic factors determine the outcome of therapy [e.g. age, sex, initial white blood cell count (WBC), etc.]; however, it is believed that other mechanisms such as glutathione S-transferase (GST) gene mutation, the expression of lung resistance protein (LRP), and multidrug resistance-associated protein (MRP) also plays a role in treatment failure. In this study, GST gene mutations including GSTM1 and GSTT1 were evaluated in patients with leukemia. Thirty newly diagnosed ALL patients younger than 15 years of age participated in the present study. Bone marrow aspiration and biopsy were evaluated for immune phenotyping and DNA was extracted for GST genotyping. All data plus sex, age, initial WBC count, central nervous system (CNS) or testicular involvement, immune phenotype, and outcome (relapse or not) were analyzed statistically. Genotyping showed that 46% were double null, 50% were M1 null and 93.3% were T1 null for GST mutations. There was no statistically significant relationship between GSTT1 and GSTM1 mutations, or between double null status, prognostic factors and relapse (P > .05). So, although the results of GST mutations were consistent, it seems that these mutations are not statistically significant.

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Accession: 056245034

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PMID: 23444902

DOI: 10.3109/08880018.2013.773474

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