- Patients who have had chemotherapy or radiotherapy within 4 weeks (6 weeks for nitrosoureas or mitomycin C) prior to entering the study or those who have not recovered from adverse events (AEs) due to agents administered more than 4 weeks earlier (i.e., grade >= 2 AE present); palliative (limited-field) radiation therapy is permitted, as long as the lesion being considered for palliative radiation is not a target lesion