Squamous Cell Carcinoma of the Head and Neck affects 43,000 individuals in the United States annually with an estimated overall survival rate of 50%. In order to improve both the survival rate and quality of life for patients who develop unresectable disease recurrence, new therapeutic alternatives are mandated. One potential treatment alternative for this patient population is the use of peptide-based immunotherapy. Despite the success fo preclinical studies using peptide vaccines, therapeutic responses in patients have been sporadic. The reasons for failure are multifactorial and include problems with patient selection, a limited number of antigenic targets, and an inability to correlate immunologic response with therapeutic efficacy. Specifically, patients with disseminated SCCHN have defects in antigen processing, presentation and effector mechanisms that limit their ability to respond to T cell based immunotherapy. Additionally, a paucity of antigenic peptide epitopes are defined for SCCHN, and immunologic monitoring does not correlate well with clinical response.