- Patients must have completed any major surgery chemotherapy, radiation therapy, or biologic therapy greater than or equal to 4 weeks prior to entering the study (6 weeks for nitrosoureas or mitomycin C). Patients must be greater than or equal to 2 weeks since any prior administration of a study drug in an exploratory IND (investigational new drug) /Phase 0 study. Patients must have recovered to eligibility levels from any prior surgery, toxicity, or adverse events.