The main purpose of this study is to find out the highest possible dose of maprotiline that can be given safely in combination with temozolomide and tamoxifen. Temozolomide is approved to treat glioblastoma and the investigator wants to understand what doses are safe to use. Tamoxifen has been used for many years to treat breast cancer and there have also been studies combining it with temozolomide for the treatment of brain tumors that have shown the combination to be safe. In this study, the investigator will be adding maprotiline to temozolomide and tamoxifen, determining the highest possible dose that is safe, making sure there are no significant drug interactions and studying the safety of this combination.
The main purpose of this study is to find out the highest possible dose of maprotiline that can be given safely in combination with temozolomide and tamoxifen.