A recombinant Listeria strain expressing a kallikrein-related peptidase 3 (KLK3) peptide, wherein the sequence of the KLK3 peptide comprises a sequence selected from SEQ ID NOs: 27, 29-32, 34, and 36-39, or a sequence greater than 95% identical thereto, wherein the KLK3 peptide is in the form of a fusion peptide and further comprises a non-KLK3 peptide, wherein the non-KLK3 peptide is an ActA peptide or a PEST sequence, and wherein the non-KLK3 enhances the immunogenicity of the fusion peptide.