Alphavirus vectors have frequently been applied for vaccine production. In this context, recombinant particles as well as naked nucleic acids have been applied. The proof of concept was originally demonstrated for viral surface proteins known for their potential immunogenicity and capability to induce cytotoxic T-cell (CTL) responses and protection against challenges with lethal viruses (20). Moreover, immunization against tumor challenges has resulted in some promising observations (Table 1). For instance, injection of RNA from an SFV vector expressing bacterial ^-galactosidase into mice provided protection against tumor challenges (21). Administration of recombinant SFV particles expressing the P1A gene resulted in protection against P185 tumor challenges in mice (22). The human papilloma virus (HPV) E6 and E7 oncoproteins have been
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