Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression Has spinal cord compression or clinically active central nervous system metastases, defined as untreated and symptomatic, or requiring therapy Symptomatic or untreated leptomeningeal disease or spinal cord compression Patients with untreated spinal cord metastases are eligible if lesions are asymptomatic Patient has spinal cord compression or symptomatic brain metastases. Has a history of untreated brain metastasis or history of leptomeningeal disease or spinal cord compression Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression; treated brain metastases must have been stable for at least 1 month and require treatment with less than 10 mg/day prednisone equivalent for at least two weeks prior to study drug administration Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression; treated brain metastases are allowed as long as they are stable for at least 28 days post-treatment Symptomatic or untreated brain metastases, leptomeningeal disease, or spinal cord compression Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression; if these were treated and clinically stable for 4 weeks, patient can be considered for the trial Known brain metastases or spinal cord compression Has symptomatic or untreated leptomeningeal, brain metastases, or spinal cord compression. Untreated symptomatic spinal cord compressions Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression (patients with controlled central nervous system [CNS] disease, i.e. asymptomatic and currently receiving concurrent intrathecal chemotherapy, are eligible upon discussion with the principal investigator) Symptomatic or untreated CNS metastases or spinal cord compression. Brain metastasis must be stable with verification by imaging . Are symptomatic or have uncontrolled brain metastases, leptomeningeal disease, or spinal cord compression not definitively treated with surgery or radiation (brain metastases that are stable and asymptomatic, either treated or untreated, will be allowed) Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression Symptomatic or untreated leptomeningeal disease, brain metastasis, or spinal cord compression Untreated or active primary brain tumor, central nervous system (CNS) metastases, or spinal cord compression Spinal cord compression or brain metastases Patients with untreated brain metastases, spinal cord compression, or leptomeningeal carcinomatosis are excluded from this clinical trial; patients with brain metastases or spinal cord compression previously treated with radiation and/or surgery are allowed if local treatment was > 30 days ago, most recent MRI demonstrates stability or decrease in size of all lesions, and the patient has no current neurologic symptoms related to the metastases and treatment and no requirement for corticosteroids related to the prior treatment Active or untreated brain metastases or spinal cord compression Symptomatic or untreated spinal cord compression Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression Symptomatic brain or spinal cord metastases (patients must be stable for > 1 month post radiotherapy or surgery). Symptomatic or untreated spinal cord compression Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression Patients with symptomatic or untreated leptomeningeal or brain metastasis or spinal cord compression Have known untreated brain metastases, uncontrolled spinal cord compression, or leptomeningeal disease. Subject has symptomatic brain metastases, spinal cord compression, or intractable back pain due to compression of destructive mass. Untreated symptomatic spinal cord compressions Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression. Untreated spinal cord compression Brain metastases or spinal cord compression. Known spinal cord compression or brain or liver metastasis Unstable brain metastases or spinal cord compression Patients with known brain metastases or spinal cord compression should be excluded from this clinical trial Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression; treated brain metastases must have been stable for at least 1 month Untreated brain metastasis or history of leptomeningeal disease or spinal cord compression. Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression Untreated symptomatic spinal cord compressions History of, or current metastases in the brain, meninges, or untreated spinal cord compression History of, or current known metastases in the brain or untreated spinal cord compression Uncontrolled brain or spinal cord metastases Symptomatic or untreated leptomeningeal, CNS or brain metastases or spinal cord compression at the time of transition to this study. Subjects with symptomatic brain metastases, spinal cord compression, or intractable back pain due to a compressive or destructive mass Patients with untreated spinal cord metastases or metastases close to vital organs (as determined by the principal investigator) are excluded Untreated spinal cord compression. Symptomatic or untreated leptomeningeal disease or brain metastases or spinal cord compression Untreated or inadequately treated spinal cord compression Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression. Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression; treated brain metastases must have been stable for at least 1 month Symptomatic or untreated brain metastases or spinal cord compression or any of these conditions requiring chronic steroids to control symptoms. Subjects with CNS symptoms should undergo a CT scan or MRI of the brain to exclude new or progressive brain metastases. Spinal cord metastasis is acceptable. However, subjects with spinal cord compression should be excluded. History of or known presence of brain or spinal cord metastases Brain metastases or spinal cord compression not definitively treated with surgery and/or radiation, or previously treated central nervous system (CNS) metastases or spinal cord compression without evidence of stable disease for >/= 14 days Diagnosis of primary brain tumor; untreated brain metastasis or history of leptomeningeal disease or spinal cord compression; Untreated brain metastasis or history of leptomeningeal disease or spinal cord compression; Untreated or symptomatic brain metastasis, leptomeningeal disease or spinal cord compression. Subjects who are on a stable dose of corticosteroids for more than 1 month or off corticosteroids for 2 weeks can be enrolled with approval of medical monitor. Subjects are not permitted to receive enzyme-inducing anti-epileptic drugs. Symptomatic or untreated leptomeningeal or brain metastases or spinal cord compression; patients with treated central nervous system (CNS) metastasis, no longer requiring steroid therapy are potentially eligible; patients with primary glioblastoma multiforme not requiring steroid therapy will be eligible Patients with a current, untreated spinal cord compression