The IL-15-based superagonist ALT-803 promotes the antigen-independent conversion of memory CD8⁺T cells into innate-like effector cells with antitumor activity

ALT-803, an interleukin-15-based superagonist, induces memory CD8+ T cells to proliferate, upregulate receptors involved in innate immunity, secrete interferon γ and acquire the ability to kill malignant cells in the absence of antigenic stimulation. Thus, ALT-803 can promote the expansion and activation of memory CD8+ T cells while converting them into innate immune effector cells that exhibit robust antineoplastic activity.