- Patients with progressive brain metastases must have a baseline brain MRI within 28 days prior to registration; brain metastases must be progressive and >= 10 mm in longest dimension on radiographic imaging AFTER prior intracranial radiation (IR) therapy (i.e., whol brain radiation therapy [WBRT], stereotactic radiosurgery [SRS], gamma knife [GK] or local equivalent); patients must not have evidence of diffuse leptomeningeal disease on brain MRI or by previously documented cerebrospinal fluid (CSF) cytology; discrete dural metastases are permitted; there must be no evidence of hemorrhage or impending herniation on baseline brain imaging; patients with contraindication to gadolinium-enhanced MRI imaging are not eligible