Inclusion Criteria:

          -  Patients with Ph-, CD19+ ALL, with any of the following:

          -  Relapsed or refractory to at least 2 prior regimens ≥ 5% blasts in the bone marrow or
             peripheral blood or persistent extranodal/marrow site (such as skin).

          -  Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2

          -  Age ≥ 18 years of age, at the time of informed consent.

          -  Subject has provided informed consent. Those unable to provide consent for themselves
             will not be eligible.

          -  Pts may have been exposed to either agent in the past if they had at least 6 months of
             response from start of therapy AND it has been at least 6 months since their last dose
             of either agent.

        Exclusion Criteria:

          -  History of malignancy other than ALL within 3 years prior to start of
             protocol-required therapy with the exception of:

          -  Malignancy treated with curative intent and with no known active disease present for 2
             years before enrollment and felt to be at low risk for recurrence by the treating
             physician

          -  Adequately treated non-melanoma skin cancer or lentigo maligna without evidence of
             disease

          -  Adequately treated cervical carcinoma in situ without evidence of disease

          -  Adequately treated breast ductal carcinoma in situ without evidence of disease

          -  Prostatic cancer without evidence of progression for 1 year.

          -  History or presence of clinically relevant CNS pathology as adult seizures, recent
             stroke (within 1 year), severe brain injuries, Parkinson's disease, psychosis

          -  With the exception of CNS leukemia that is well controlled with therapy prior to
             enrolling on this study. A negative CNS evaluation for active disease is required
             within 3 months of enrollment in those with prior history within one year of active
             CNS disease .

          -  Current severe autoimmune disease or history of autoimmune disease with potential CNS
             involvement such as lupus, sjogren's, psoriasis, multiple sclerosis, wegener's
             granulomatosis.

          -  Allogeneic HSCT within 12 weeks prior to start of blinatumomab/marqibo

          -  Any active acute Graft-versus-Host Disease (GvHD) grade 2 to grade 4 according to the
             Glucksberg criteria or active chronic GvHD requiring systemic treatment of more than
             10 mg prednisone daily (or equivalent)

          -  Cancer chemotherapy or immunotherapy within 2 weeks prior to start of
             blinatumomab/marqibo. Administration of dexamethasone and hydrea permitted within the
             21 day screening period.

        Subject received prior anti-CD19 therapy ARE eligible however if they received prior
        blinatumomab, however they are ineligible if they did not have a response to it lasting at
        least 6 months; also they are ineligible if they had exposure to blinatumomab within 6
        months of starting therapy on this study.

          -  Abnormal screening laboratory values as defined below:

          -  AST (SGOT) and/or ALT (SGPT) and/or alkaline phosphatase ≥ 5 x upper limit of normal
             (ULN)

          -  Total bilirubin ≥ 3 x ULN (unless related to Gilbert´s or Meulengracht disease)

          -  Creatinine ≥ 3 ULN or creatinine clearance < 40 mL/min (calculated)

          -  Known infection with human immunodeficiency virus (HIV) or chronic active infection
             with hepatitis B virus (PCR positive) or hepatitis C virus (PCR positive).

          -  Subject is pregnant or breast feeding

          -  Woman of childbearing potential and is not willing to use 2 highly effective methods
             of contraception while receiving blinatumomab/marqibo and for an additional 3 months
             after the last dose of protocol-specified therapy

          -  Male who has a female partner of childbearing potential, and is not willing to use 2
             highly effective forms of contraception for at least an additional 3 months after the
             last dose of protocol-specified therapy

          -  Male who has a pregnant partner, and is not willing to use a condom during sexual
             activity for 3 months after the last dose of protocol-specified therapy

          -  Currently receiving treatment in another investigational device or drug study or less
             than 30 days since ending treatment on another investigational device or drug
             study(s). The 30 days is calculated from day 1 of blinatumomab treatment.

          -  Subject has known severe sensitivity to immunoglobulins or any of the products or
             components to be administered during dosing.

          -  History or evidence of any other clinically significant disorder, condition or disease
             (with the exception of those outlined above) that, in the opinion of the Investigator,
             would pose a risk to subject safety or interfere with the study evaluation, procedures
             or completion.