PRIOR CONCURRENT THERAPY: Biologic therapy: At least 4 weeks since prior immunologic therapy No concurrent immunologic therapy Chemotherapy: At least 4 weeks since prior chemotherapy At least 6 weeks since prior mitomycin or nitrosoureas No prior high dose chemotherapy with stem cell rescue No other concurrent chemotherapy No prior anthracycline dose exceeding the equivalent of greater than 45O mg/m2 of doxorubicin Endocrine therapy: At least 4 weeks since prior endocrine therapy (including steroids) No concurrent endocrine therapy Radiotherapy: At least 4 weeks since prior radiotherapy No prior radiation to greater than 25% of total bone marrow No concurrent radiotherapy Surgery: At least 4 weeks since prior surgery No concurrent surgery Other: At least 30 days since prior investigational agents No concurrent medications with dysrhythmic potential including, but not limited to: terfenadine, astemizole, cisapride, diphenhydramine, quinidine, procainamide, disopyramide, sotalol, probucol, bepridil, tricyclic antidepressants, haloperidol, risperidone, and indapamine No concurrent rifampin, phenobarbital, phenytoin, or other inducers of CYP3A No concurrent triazolam, alprazolam, midazolam, or other CYP3A metabolized benzodiazepines No concurrent HMG-CoA reductase inhibitors (except fluvastatin) No concurrent anticoagulant therapy (low dose warfarin therapy to maintain catheter patency allowed)