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Characteristics of head and neck primary sites in HNC-LC cohort
| Primary site | Larynx | 429 (46.9%) |
| Oral Cavity | 189 (20.7) | |
| Oropharynx | 190 (20.8) | |
| Hypopharynx | 79 (8.6) | |
| Nasopharynx | 21 (3.1) | |
| Stage at diagnosis | In situ | 23 (2.5%) |
| Localized | 302 (33.0) | |
| Regional | 396 (43.3) | |
| Distant | 46 (5.0) | |
| Unknown | 148 (16.2) | |
