- Previous anti-cancer chemotherapy, immunotherapy or investigational agents =< 3 weeks prior to the first day of study defined treatment; palliative radiation < 2 weeks; patients who receive gamma knife radiosurgery for brain metastases are eligible if procedure was performed > 2 weeks before treated is started, is clinically stable and is not receiving corticosteroid therapy; ongoing hormonal therapies (such as, luteinizing hormone-releasing hormone [LHRH] antagonists, megestrol, anti-estrogens, or aromatase inhibitors) are allowed