Table 1. Patient characteristics by human papillomavirus (HPV) status.
| Numbers (%) | |||
|---|---|---|---|
| Total | HPV-positive | HPV-negative | |
| Study population | 121 | 98 (81.0%) | 23 (19.0%) |
| Gender | |||
| Male | 87 (71.9%) | 74 (85.1%) | 13 (14.9%) |
| Female | 34 (28.1%) | 24 (70.6%) | 10 (29.4%) |
| OPC subsite | |||
| Tonsillar | 77 (63.6%) | 68 (88.3%) | 9 (11.7%) |
| Base of the tongue | 32 (26.4%) | 26 (81.3%) | 6 (18.7%) |
| Soft palate/pharyngeal wall | 12 (10.0%) | 4 (33.3%) | 8 (66.7%) |
| T-stage | |||
| 1 | 26 (21.5%) | 24 (92.3%) | 2 (7.7%) |
| 2 | 54 (44.6%) | 46 (85.2%) | 8 (14.8%) |
| 3 | 20 (16.5%) | 17 (85%) | 3 (15%) |
| 4a | 14 (11.6%) | 8 (57.1%) | 6 (42.9%) |
| 4b | 7 (5.8%) | 3 (42.9%) | 4 (57.1%) |
| N-stage | |||
| 0 | 29 (24%) | 24 (82.8%) | 5 (17.2%) |
| 1 | 18 (14.9%) | 13 (72.2%) | 5 (27.8%) |
| 2a | 10 (8.3%) | 10 (100%) | 0 (0%) |
| 2b | 48 (39.7%) | 42 (87.5%) | 6 (12.5%) |
| 2c | 11 (9.1%) | 4 (36.4%) | 7 (63.6%) |
| 3 | 5 (4.1%) | 5 (100%) | 0 (0%) |
| M-stage | |||
| 0 | 117 (96.7%) | 95 (81.2%) | 22 (18.8%) |
| 1 | 4 (3.3%) | 3 (75%) | 1 (25%) |
| Clinical stage | |||
| I | 3 (2.5%) | 2 (66.7%) | 1 (33.3%) |
| II | 14 (11.6%) | 13 (92.9%) | 1 (7.1%) |
| III | 20 (16.5%) | 15 (75%) | 5 (25%) |
| IVA | 70 (57.9%) | 59 (84.3) | 11 (15.7%) |
| IVB | 10 (8.3%) | 6 (60%) | 4 (40%) |
| IVC | 4 (3.3%) | 3 (75%) | 1 (25%) |
| Smoking habits | |||
| Smokers (or recently stopped) | 45 (37.1%) | 29 (64.4%) | 16 (35.6%) |
| Ex-smokers | 34 (28.1%) | 27 (79.4%) | 7 (20.6%) |
| Never smoked | 42 (34.7%) | 42 (100%) | 0 (0%) |
| Initial treatment intention | |||
| Curative | 109 (90%) | 93 (85.3%) | 16 (14.7%) |
| Palliative | 12 (10%) | 5 (41.7%) | 7 (58.3%) |
| Survival | |||
| Deceased during 3-year follow-up | 35 (28.9%) | 17 (48.6%) | 18 (51.4%) |
| Died of OPC | 26 (21.5%) | 11 (42.3%) | 15 (57.7%) |