CD4-Positive T-Lymphocytes/metabolism; CD8-Positive T-Lymphocytes/metabolism; Carcinoma/genetics; Head and Neck Neoplasms/genetics; Receptors, OX40/genetics; Tumor Necrosis Factor Receptor Superfamily, Member 9/genetics; CD4-Positive T-Lymphocytes/pathology; CD8-Positive T-Lymphocytes/pathology; CTLA-4 Antigen/genetics; CTLA-4 Antigen/immunology; Carcinoma/immunology; Carcinoma/pathology; Case-Control Studies; Flow Cytometry; Gene Expression Regulation, Neoplastic; Head and Neck Neoplasms/immunology; Head and Neck Neoplasms/pathology; Humans; Inducible T-Cell Co-Stimulator Protein/genetics; Inducible T-Cell Co-Stimulator Protein/immunology; Influenza, Human/genetics; Influenza, Human/immunology; Influenza, Human/pathology; Neoplasm Staging; Orthomyxoviridae/immunology; Papillomaviridae/immunology; Programmed Cell Death 1 Receptor/genetics; Programmed Cell Death 1 Receptor/immunology; Receptors, Antigen, T-Cell/genetics; Receptors, Antigen, T-Cell/immunology; Receptors, OX40/immunology; Tumor Necrosis Factor Receptor Superfamily, Member 9/immunology