The present invention provides an immunoconjugate having the formula: T-c-En-c-Fcn or T-c-Fcn-c-En wherein, T is a single chain variable portion fragment of a monoclonal antibody (scFv) directed to a target protein, polypeptide, or fragment thereof, which is highly expressed on cancer cells E is two or more foreign immunogenic CD8+ T cell antigenic epitopes c is a peptide or polypeptide fragment thereof, capable of being cleaved by a specific protease and Fc is two or more Fc portions of an IgG antibody. Nucleic acid sequences encoding the same and vectors containing said nucleic acid sequences are also provided. Methods of making the immunoconjugate, along with methods of making target cells susceptible to CTL mediated cell killing, and methods for treatment of cancers are also provided.
