6. Presence of symptomatic central nervous system (CNS) metastases (indicated cerebral edema, steroid requirement, or progressive disease), Subjects with brain or meningeal metastases that were previously treated must be clinically stable (MRI) for at least 2 months, and have discontinued systemic steroids (> 10 mg/day prednisone or equivalent) for at least 2 weeks before study drug administration;