The invention provides for a recombinant adenoviral vector comprising a recombinant oncolytic adenovirus which has: (1) a modified transcription regulatory sequence wherein the adenoviral vector is transcriptionally active in cancer cells and/or hyperproliferative cells and transcriptionally attenuated in normal cells, and (2) a transgene encoding one or more cancer antigens that are specific to a subject. The invention further provides a method of producing said recombinant adenoviral vector. The recombinant oncolytic adenoviral vector described above is used in methods of stimulating a heightened immune response against a cancer antigen in a subject or a method of treating cancer in a subject.