- Previous anti-cancer chemotherapy, immunotherapy or investigational agents < 4 weeks, or palliative radiation < 2 weeks prior to the first day of study treatment, or who have not recovered to grade 1 or better from related side effects of such therapy (except alopecia); patients who receive gamma knife radiosurgery for brain metastases are eligible if procedure was performed > 2 weeks before treatment is started, is clinically stable and has been on stable low dose corticosteroid treatment (e.g., dexamethasone 2 mg/day, prednisolone 12 mg/day for at least 14 days before start of study treatment are eligible); ongoing hormonal therapies (luteinizing hormone-releasing hormone [LHRH] antagonists, megestrol) are allowed