<qa>  What is the name of the test that will be repeated every 4 weeks?If tumors do not grow and serious side effects do not occur, participants may keep on taking temozolomide and R115777 for up to 2 year. If your physician thinks it is advisable, treatment may continue with R115777 alone after that time. In this case, routine blood tests for counts, liver and kidney function less than 2 tablespoons will be repeated every 4 weeks and MRI scans, physical, and neurological exams will be done every 8 weeks. Participants may not receive any other treatment for cancer including surgery while taking part in this study. 