- Known CNS metastases, except for treated brain metastasis. Treated brain metastases are defined as having no evidence of progression or hemorrhage after treatment and no ongoing requirement except for dexamethasone, as ascertained by clinical examination and brain imaging (MRI or CT) during the screening period. Anticonvulsants (stable dose) are allowed. Treatment for brain metastases may include radiotherapy, chemotherapy or immunotherapy Patients with CNS metastases treated by neurosurgical resection or biopsy performed within 3 months of treatment will be excluded.