This invention provides methods of treating and vaccinating against an antigen-expressing tumor and inducing an immune response against a sub-dominant epitope of antigen, comprising a fusion of an LLO fragment to the antigen or a recombinant Listeria strain expressing the antigen. The present invention also provides recombinant peptides comprising a listeriolysin (LLO) protein fragment fused to a Her-2 protein or fragment thereof, recombinant Listeria strains expressing a Her-2 protein, vaccines and immunogenic compositions comprising same, and methods of inducing an anti-Her-2 immune response and treating and vaccinating against a Her-2-expressing tumor, comprising same.