Subjects with inactive central nervous system (CNS) metastasis are eligible.. Active, untreated central nervous system (CNS) metastasis Patient with active central nervous system (CNS) metastasis or with history of CNS metastasis Symptomatic central nervous system (CNS) malignancy or metastasis. Have symptomatic central nervous system malignancy or metastasis. Have symptomatic central nervous system (CNS) malignancy or metastasis. Symptomatic central nervous system metastasis (e.g., patients requiring increasing doses of steroids) Have symptomatic central nervous system (CNS) malignancy (with the exception of medulloblastoma) or metastasis (screening not required). Central nervous system (CNS) metastasis. Patients with active (untreated or relapsed) central nervous system (CNS) metastasis of the patients myeloma Central nervous system (CNS) metastasis About to undergo palliative radiation for a symptomatic central nervous system (CNS) metastasis Central nervous system (CNS) metastasis Active (symptomatic) central nervous system (CNS) metastasis. Presence of untreated and/or symptomatic central nervous system (CNS) metastasis History of asymptomatic or symptomatic central nervous system (CNS) metastasis Patient with active central nervous system (CNS) metastasis or with history of CNS metastasis History of central nervous system (CNS) metastasis. Patients with active (untreated or relapsed) central nervous system (CNS) metastasis of the patients myeloma Symptomatic central nervous system (CNS) metastasis. Symptomatic brain metastasis or uncontrolled central nervous system (CNS) metastasis will not be permitted Has active central nervous system (CNS) or leptomeningeal metastasis Have symptomatic central nervous system metastasis. Screening of asymptomatic participants is not required for enrollment. Central nervous system (CNS) metastasis. Have the presence of unstable central nervous system (CNS) metastasis. Have symptomatic central nervous system (CNS) malignancy or metastasis (screening not required). Active or untreated central nervous system (CNS) metastasis Have clinical evidence or a history of central nervous system (CNS) metastasis Known untreated central nervous system (CNS) metastasis Symptomatic Central Nervous System (CNS) metastasis Central nervous system (CNS) metastasis Have symptomatic central nervous system (CNS) malignancy or metastasis. Screening of asymptomatic subjects without history of CNS metastases is not required. Symptomatic central nervous system (CNS) malignancy or metastasis. Patients with active (untreated or relapsed) central nervous system (CNS) metastasis of the patients myeloma History of central nervous system (CNS) metastasis that are untreated or not stable Clinically unstable central nervous system (CNS) metastasis Clinical evidence of central nervous system (CNS) metastasis. For Dose Escalation (Part A): Have central nervous system (CNS) malignancy or metastasis Have active central nervous system (CNS) metastasis Symptomatic central nervous system disease, malignancy, or metastasis Known untreated central nervous system (CNS) metastasis Known central nervous system (CNS) disease except for treated brain metastasis Evidence of central nervous system (CNS) metastasis who have not received prior definitive therapy for their lesions. Current uncontrolled central nervous system (CNS) metastasis or malignant brain tumors Patients with Central Nervous System (CNS) metastasis which are: symptomatic or require treatment for symptom control and/or growing Symptomatic central nervous system malignancy or metastasis (screening not required). Have symptomatic central nervous system (CNS) malignancy or metastasis Active untreated central nervous system (CNS) metastasis Known untreated central nervous system (CNS) metastasis; patients with CNS metastasis will be allowed on study once treated Known brain metastasis or primary central nervous system (CNS) malignancy Patient must not have untreated or symptomatic central nervous system (CNS) metastasis Have symptomatic central nervous system (CNS) malignancy or metastasis. Subjects with symptomatic brain metastasis or central nervous system (CNS) disease