IL2 and neoplasm: In addition, the absence of standardized culture systems leads to inconsistent cell purity and cytotoxic activity, thereby limiting the efficacy and translational potential of NK cell-based tumor therapy.<h4>Method</h4>We demonstrated that <i>in vitro</i> activation by a combination of cytokines, followed by prolonged expansion with high doses of IL-2, can induce and expand memory-like NK cells from UCB.