The data suggest a hitherto unknown gender-specific impact of the -24C>T ABCC2 gene polymorphism on high-dose methotrexate pharmacokinetics. Whereas a nonfunctional MRP2 variant has been described in a patient with severe impairment of methotrexate excretion, our study is the first to suggest that a frequent ABCC2 polymorphism contributes to variability of methotrexate kinetics.
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