IL15 and neuroblastoma: Finally, NK cells derived from healthy donors and NB patients that were ex vivo stimulated with IL-2 and/or 562-mbIL21 stimulatory cells were injected into NB murine models, along with anti-GD2 [160, 161] and/or IL-2, and IL-15 [160, 162] before and after tumor resection [160].