Intrathecal Chemoprophylaxis to Prevent Neurotoxicity Associated With Blinatumomab Therapy for Acute Lymphoblastic Leukemia

Inclusion Criteria: * Adults receiving first cycle of blinatumomab for relapse/refractory or MRD-positive B-cell Acute Lymphoblastic Leukemia * Adequate renal and hepatic function * Negative for HIV * Negative serum pregnancy test, if applicable * ECOG 0-2 Exclusion Criteria: * Active CNS involvement by ALL * Relative CNS disorders (seizure, paresis, aphasia, Cerebrovascular ischemia/hemorrhage, severe brain injury, dementia, Parkinson's, cerebellar disease, psychosis, coordination or movement disorder) * Contraindication to receive intrathecal methotrexate * Prior treatment with blinatumomab * Active malignancy other than ALL * Active infection or any other concurrent disease or medical condition that was deemed to interfere with the conduct of the study as judged by the investigator