| CTLA-4 | Cytotoxic T lymphocyte-associated protein 4 |
| DM | Distant metastasis |
| FFPE | Formalin-fixed paraffin-embedded |
| HE | Hematoxylin-eosin |
| HNSCC | Head and neck squamous cell carcinoma |
| HPV | Human papillomavirus |
| HR | Hazard Ratio |
| IFN-γ | Interferon-γ |
| IL-21 | Interleukin-21 |
| LM | Lymph node metastasis |
| LR | Local recurrence |
| NR2F6 | Nuclear receptor family 2 subgroup 6 |
| PD-1 | Programmed cell death-1 |
| PD-L1 | Programmed cell death ligand-1 |
| PT | Primary tumor |
| ROI | Region of Interest |
| TMA | Tissue microarray |
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