N-803 (ALT-803), which is an IL15 cytokine antibody fusion protein, is a complex of the IL15 superagonist and the dimer IL15 receptor α Su/IgG1 Fc fusion protein, and it has been studied in combination with other agents in preclinical trials, which revealed an additive tumor suppression effect [49,50,51]. Here, IL15 is linked to neoplasm.