- S1416 is one study with two cohorts; patients who have progressive brain metastases after surgical excision and/or intracranial radiation will be in the Progressive Brain Metastases Cohort and will require a baseline magnetic resonance imaging (MRI); patients with previously treated brain metastases, stable disease and stable neurologic function for 14 days prior to trial registration will be in the Standard Cohort and may obtain MRI of the brain at the physician's discretion; randomization and treatment is the same for both cohorts