Treatment of Relapsed or Chemotherapy Refractory Chronic Lymphocytic Leukemia or Indolent B Cell Lymphoma Using Autologous T Cells Genetically Targeted to the B Cell Specific Antigen CD19

Inclusion: • Patients must have the following CD19+ B cell leukemia or lymphoma either with relapsed or chemotherapy-refractory disease or with evidence of residual disease following therapy. In all cases, patient's disease must be confirmed at MSKCC. * CLL: Patients must have a diagnosis of CLL as evidenced by flow cytometry, bone marrow histology, and/or cytogenetics. * Other low grade B-cell neoplasms are eligible for study, such as small lymphocytic lymphoma (SLL), follicular lymphoma, Waldenstrom's macroglobulinemia, hairy cell leukemia, marginal zone lymphomas, and mantle cell lymphomas. * Creatinine ≤2.0 mg/100 ml, bilirubin ≤2.0 mg/100 ml, AST and ALT ≤3.0x normal, PT and PTT ≤ 2x normal outside the setting of stable chronic anticoagulation therapy, granulocytes ≥1,000/mm3, platelets ≥50,000/mm3, hemoglobin ≥8.0g/dl with transfusion support * Adequate cardiac function (LVEF ≥40%) as assessed by ECHO or MUGA scan performed within 1 month of treatment. * Adequate pulmonary function as assessed by ≥92% oxygen saturation on room air by pulse oximetry. * Life expectancy of \> 3 months. Exclusion: * Karnofsky performance status \<70. * CLL patients with active transformed disease (Richter's transformation) are ineligible for enrollment on this study. * Patients with following cardiac conditions will be excluded: * New York Heart Association (NYHA) stage III or IV congestive heart failure * Myocardial infarction ≤6 months prior to enrollment * History of clinically sign…