In the Phase II study NCT01106950 (Additional file 3: Table S3, row 1), 15 AML patients received IL-2 every other day (for a total of 6 doses) after infusion with donor-derived PB-NK cells and with IL-2 diphtheria toxin (IL2DT, Ontak). This evidence concerns the gene IL2 and acute myeloid leukemia.