Disclosed are methods, kits, polypeptides, and pharmaceutical compositions for inducing an immune response in a subject, which may include a T-cell mediated immune response. The methods comprise administering to the subject, or to explanted cells of the subject, a pharmaceutical composition comprising an effective amount of versikine or a variant of versikine that induces the T-cell mediated immune response. The methods, kits, polypeptides, and pharmaceutical compositions may be used, in particular, to treat a subject having a cell proliferative disease or disorder.