Patients undergo blood and tumor tissue collection at baseline and periodically during study for immunological correlative studies. Peripheral blood mononuclear cells isolated from blood samples are analyzed for antigen-specific CD4-positive or CD8-positive T-cell response by flow cytometry or by TGF-β1 ELISPOT assay to measure TGF-β1- secreting cells. Tumor cell lysates extracted from tumor samples are pulsed with autologous dendritic cells and analyzed by ELISPOT assay to measure T-cell reactivity in tumor specimens.