- Patients with brain metastases treated with whole brain radiation that have been stable for 2 months are eligible; patients with brain metastases treated with gamma knife or surgery are allowed to participate after 3 weeks have elapsed since their procedure . Demonstration of brain stability by an imaging study after the procedure is required for gamma knife or CNS surgery patients. Subjects are excluded if they have leptomeningeal or metastases causing spinal cord compression that are symptomatic or untreated or not stable for ≥3 months (must be documented by imaging) or requiring corticosteroids. Subjects on a stable dose of corticosteroids >1 month or who have been off of corticosteroids for at least 1 week can be enrolled with approval of the medical monitor