<qa>  What is the difference between dendritic cells and immunotherapy?- Compare the efficacy of vaccination with autologous dendritic cells pulsed with tumor and influenza antigen peptides with or without ex vivo CD40-ligand and denileukin diftitox, in terms of tumor-specific T-cell response, in patients with HLA-A1- andor HLA-A2.1-positive stage III or IV melanoma. 