Variants of the MTHFR gene and susceptibility to acute lymphoblastic leukemia in children: A synthesis of genetic association studies

Background: Acute lymphoblastic leukemia (ALL) is a complex disease with genetic background. The genetic association studies (GAS) that investigated the association between ALL and the MTHFR C677T and A1298C gene variants have produced contradictory or inconclusive results. Materials and methods: In order to decrease the uncertainty of estimated genetic risk effects, a meticulous meta-analysis of published GAS related the variants in the MTFHR gene with susceptibility to ALL was conducted. The risk effects were estimated based on the odds ratio (OR) of the allele contrast and the generalized odds ratio (ORG). Cumulative and recursive cumulative meta-analyses were also performed. Results: The analysis showed marginal significant association for the C677T variant, overall [OR = 0.91 (0.82-1.00) and ORG = 0.89 (0.79-1.01)], and in Whites [OR = 0.88 (0.77-0.99) and ORG = 0.85 (0.73-0.99)]. The A1298C variant produced non-significant results. For both variants, the cumulative meta-analysis did not show a trend of association as evidence accumulates and the recursive cumulative meta-analysis indicated lack of sufficient evidence for denying or claiming an association. Conclusion: The current evidence is not sufficient to draw definite conclusions regarding the association of MTHFR variants and development of ALL. (C) 2011 Elsevier Ltd. All rights reserved.