Precursor B Cell Acute Lymphoblastic Leukemia (B-ALL) Treated With Autologous T Cells Genetically Targeted to the B Cell Specific Antigen CD19

Pts will undergo leukapheresis. The leukapheresis product will be washed \& frozen until the GTF is directed to start T cell production by the PI. CD3+ T cells will be isolated from the leukapheresis, \& transduced with the 19-28z chimeric receptor \& expanded. All relapsed (either MRD+ or morphologic) \& refractory pts get re-induction chemo whenever feasible to optimally reduce the tumor burden prior to the T cell infusion. The re-induction chemo regimen will be selected by the treating dr. based on prior therapy, adverse reactions to chemo \& highest likelihood to achieve an optimal response. Once pts recover from the toxicities of the re-induction chemo the disease status will be re-evaluated by repeating bone marrow aspirate or biopsy. Pts get conditioning chemo (min 2 weeks from end of re-induction chemo) followed 2-7 days later by the 19-28z+ T cells. Pts will be tx in 2 cohorts with diff doses of T cells according to the amount of disease immediately prior to the T cell infusion.