Abstract
High-dose methotrexate (HD-MTX) infusions associated with vindesine (VDS) have been used in the treatment of head and neck cancer. In a previous study, VDS was shown to increase the apparent plasma clearance of MTX. We have studied the MTX hydroxylation process in the presence of VDS. Different routes of administration have been tested (IV pushes and 24-h or 36-h infusions). A radioimmunoassay has been developed to measure 7-OH-MTX. The defined protocols enabled us to show that VDS influences not only the pharmacokinetic behavior of methotrexate but also its hydroxylation, which is decreased in presence of VDS.
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