IL15 and neoplasm: Stimulation with IL-2 or IL-15 resulted in significantly increased cytotoxic activity toward all three tumor cell lines (Fig. 3A), of which IL-15 demonstrated significantly greater target cell lysis than IL-2 in all three target cell lines (Viable Raji: 11.4 ± 4.1% vs 8.7 ± 4.1%, viable PANC-1: 49.6 ± 3.1% vs 34.8 ± 6.0%, and viable LIM2099: 68.7 ± 5.8% vs 47.9 ± 15.6%, respectively; Fig. 3B).