- All subjects must undergo either a CT or MRI of the brain within 28 days of registration. Subjects with asymptomatic brain metastasis are eligible for this protocol but their metastasis must be clinically stable and asymptomatic. Subjects with Central Nervous System (CNS) metastasis must have been evaluated by neurosurgery prior to entry to confirm that they are a candidate for this trial. Treatment of symptomatic CNS metastasis that is required before protocol entry.