“…Among the strategies being evaluated preclinically to address this issue, utilization of cytokines to induce NK cell persistence and expansion seems to dominate current clinical trials. While a number of cytokines have been tested, IL-15 appears to be the most logical choice due to its known physiologic role on NK cell development and homeostasis without stimulating regulatory T cells (4)(5)(6)(7). Several clinical trials (NCT02395822, NCT01385423, NCT03388632, NCT01727076, NCT01572493, NCT01021059, NCT01369888, NCT01875601, NCT01885897, NCT02191098, NCT01946789, NCT02989844, NCT03054909, NCT02384954) are underway using IL-15 with dosing strategies, including i.v.…”