CD28 and leukemia: In our previous report comparing CD3/CD28 Dynabead T cells with OKT3/IL-2 T cells in the Nalm6 leukemia mouse model, the mice were treated with CD19 CAR RNA-electroporated T cells, and we found that OKT3/IL-2 T cells were inferior to the CD3/CD28 Dynabead T cells in controlling leukemia.