To further evaluate the GVL capacity of STAT3–/– T cells in comparison with WT T cells, the recipients bearing 10 × 103 ALL tumor cells were injected with titrated numbers (2.5 × 106, 1.25 × 106, 0.625 × 106, and 0) of WT and STAT3–/– T cells. This evidence concerns the gene STAT3 and neoplasm.