The purpose of this study is to determine efficacy of intrathecal mafosfamide, a preactivated derivative of cyclophosphamide against meningeal malignancies refractory to conventional therapy (radiation therapy and chemotherapy). The maximally tolerated dose for intrathecal mafosfamide will be established in a limited dosage escalation schedule. The CSF pharmacokinetics of intrathecal mafosfamide will also be studied.~Mafosfamide will be administered intrathecally on a bi-weekly basis for four weeks, followed by twice monthly administration for four months and then monthly IT administration. A minimum of 9 patients will be studied in each disease category (leukemias, lymphomas, and other malignancies refractory to conventional therapy).
The purpose of this study is to determine efficacy of intrathecal mafosfamide, a preactivated derivative of cyclophosphamide against meningeal malignancies refractory to conventional therapy (radiation therapy and chemotherapy). The maximally tolerated dose for intrathecal mafosfamide will be established in a limited dosage escalation schedule. The CSF pharmacokinetics of intrathecal mafosfamide will also be studied.~Mafosfamide will be administered intrathecally on a bi-weekly basis for four weeks, followed by twice monthly administration for four months and then monthly IT administration. A minimum of 9 patients will be studied in each disease category (leukemias, lymphomas, and other malignancies refractory to conventional therapy).