Vaccination of HLA-A1 and/or -A2+ Stage III or IV Melanoma Patients With Tumor Peptide-Loaded Autologous Dendritic Cells With Prior Depletion of CD25-Positive Cells Using Denileukin Difitox (ONTAK)

OBJECTIVES:

• 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- and/or HLA-A2.1-positive stage III or IV melanoma.
• Determine the safety and tolerability of these vaccinations in these patients.
• Determine tumor response in patients treated with these vaccinations.

OUTLINE:

• Phase I (Administration of denileukin diftitox and vaccinations #1 to #4): Patients undergo leukapheresis for collection of peripheral blood mononuclear cells (PMBC). PBMC are processed for the generation of dendritic cells (DC) to be used for vaccinations. DC are pulsed with HLA-A1- and HLA-A2.1-restricted peptides derived from melanoma-associated tumor antigens. DC are pulsed with or without ex vivo treatment with CD40-ligand. Patients receive denileukin diftitox IV for 3 consecutive days before the first vaccination. Patients receive 4 pulsed DC vaccinations subcutaneously (SC) on days 1, 14, 42, and 70 in the absence of disease progression or unacceptable toxicity.

Patients who show a tumor response (at least stable disease) may receive vaccination #5 and further booster vaccinations.