- Subjects with brain or subdural metastases are not eligible, unless they have completed local therapy and have discontinued steroids for this indication for greater than or equal to 4 weeks before starting study treatment. Symptoms attributed to brain metastases must be stable for greater than or equal to 4 weeks before starting study treatment; radiographic stability should be determined by comparing contrast-enhanced computed tomography (CT) or magnetic resonance imaging (MRI) brain scan performed during screening to a prior scan performed 4 weeks earlier.