Abstract
Relapse is a threat in patients treated for acute lymphoblastic leukemia (ALL). Methylenetetrahydrofolate reductase (MTHFR) activity may affect the sensitivity of patients to folate-based chemotherapeutic drugs, thus influencing the relapse risk. Two polymorphisms of the gene encoding MTHFR, C677T and A1298C, alter MTHFR enzyme activity and may be associated with ALL relapse. The aim of this meta-analysis was to clarify the correlation between the C677T and A1298C polymorphisms and ALL relapse. To this end, data were collected from studies of the association between these two polymorphisms and ALL relapse. Analysis of the data revealed a serious contradiction among the results. A recessive model demonstrated that the ALL relapse risk was significantly increased in carriers of the 677 TT genotype, especially for pediatric ALL, but was unaffected by the A1298C polymorphism. These findings confirm that the MTHFR C677T polymorphism could be considered as a good marker of the pediatric ALL relapse risk.
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