Table 6.
Distribution of primary tumor anatomical sites according to the TNM classification (category N).
| Category | Anatomical site | Number of patients (%) |
|---|---|---|
| Oral cavity | 94 (40) | |
| Larynx | 87 (37) | |
| N0 | Oropharynx | 31 (13) |
| Hypopharynx | 15 (6) | |
| Nasopharynx | 4 (2) | |
| Unknown primary site | 2 (1) | |
| Oral cavity | 25 (42) | |
| Larynx | 13 (22) | |
| N1 | Oropharynx | 13 (22) |
| Hypopharynx | 6 (10) | |
| Unknown primary site | 3 (5) | |
| Oral cavity | 12 (23) | |
| Larynx | 9 (17) | |
| N2 | Oropharynx | 12 (23) |
| Hypopharynx | 7 (13) | |
| Nasopharynx | 3 (6) | |
| Unknown primary site | 9 (17) | |
| Oral cavity | 5 (21) | |
| Larynx | 6 (25) | |
| N3 | Oropharynx | 2 (8) |
| Hypopharynx | 3 (13) | |
| Unknown primary site | 8 (33) | |
| Nx | Larynx | 1 (33) |
| Unknown primary site | 2 (67) |