Provided are expression vectors for generating an immune response to a mucin. The vectors comprise a transcription unit encoding a secretable polypeptide, the polypeptide comprising a secretory signal, a mucin antigen and CD40 ligand. Also provided are methods of generating an immune response against cells expressing a mucin by administering an effective amount of the vector. Further provided are methods of generating an immune response against cancer cells expressing a mucin in an individual by administering an effective amount of the vector. Still further provided are methods of overcoming anergy to a mucin self antigen by administering an effective amount of the vector.
