- Patients with stable brain metastases will be allowed to enroll. Stable brain metastases being defined as no progression of brain metastases 28 days after conclusion of definitive treatment as documented by a computed tomography (CT) scan or magnetic resonance imaging (MRI) of the brain. Patients with incidentally discovered asymptomatic brain metastases may be enrolled and treated with chemotherapy without prior brain irradiation if deemed feasible by the treating physician.