CAR T cells targeting commonly overexpressed leukemia and lymphoma markers such as CD19 have shown promise in the prevention and treatment of malignancies such as Acute Lymphoblastic Leukemia (ALL), Chronic Lymphocytic Leukemia (CLL), Non-Hodgkin's lymphoma (NHL), Diffuse Large B cell lymphoma (DLBCL), and other B cell malignancies (5–8). The gene discussed is CD19; the disease is B-cell chronic lymphocytic leukemia.