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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Effects of methylenetetrahydrofolate reductase and reduced folate carrier 1 polymorphisms on high-dose methotrexate-induced toxicities in children with acute lymphoblastic leukemia or lymphoma.

The authors investigated whether high-dose methotrexate-induced toxicity differed according to the presence of methylenetetrahydrofolate reductase (MTHFR) or reduced folate carrier 1 ( RFC1) genetic polymorphism. The authors studied 15 children with acute lymphoblastic leukemia or lymphoblastic lymphoma who were treated using protocols that included high-dose methotrexate (3.0 g/m), for an overall total of 43 courses. Methotrexate-induced toxicities and the plasma methotrexate concentrations were evaluated retrospectively. Hematologic toxicity was the most frequently observed toxicity, appearing in 87% of the patients. In a subset of patients (47%), elevation of liver transaminase levels showed a repeated tendency to develop. High plasma methotrexate concentrations at 48 hours after the methotrexate infusion were not significantly related to methotrexate-induced toxicities except for mucositis. A generalized estimating equation analysis revealed that vomiting during the high-dose methotrexate treatment was more pronounced in patients who had a larger number of G alleles at the RFC1 80G>A polymorphism. No significant differences in the development of other toxicities or in the plasma methotrexate concentrations were observed for the different MTHFR 677C>T or RFC1 80G>A polymorphisms. This study suggests but does not prove that the RFC1 80G>A polymorphism may contribute to interindividual variability in responses to high-dose methotrexate.[1]

References

  1. Effects of methylenetetrahydrofolate reductase and reduced folate carrier 1 polymorphisms on high-dose methotrexate-induced toxicities in children with acute lymphoblastic leukemia or lymphoma. Shimasaki, N., Mori, T., Samejima, H., Sato, R., Shimada, H., Yahagi, N., Torii, C., Yoshihara, H., Tanigawara, Y., Takahashi, T., Kosaki, K. J. Pediatr. Hematol. Oncol. (2006) [Pubmed]
 
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