Clinico-pathological characteristics of the patients
| Variable | Cohort No. 1 | Cohort No. 2 | Cohort No. 3 | |||
|---|---|---|---|---|---|---|
| No. | % | No. | % | No. | % | |
| Total No. of Patients | 72 | 21 | 21 | |||
| Age | ||||||
| Median | 57 | 63 | 63 | |||
| Range | 41–76 | 40–73 | 41–75 | |||
| Sex | ||||||
| Male | 55 | 76.4 | 16 | 76.2 | 13 | 61.9 |
| Female | 17 | 23.6 | 5 | 23.8 | 8 | 38.1 |
| Tumor site | ||||||
| Palatine tonsil | 62 | 86.1 | 18 | 85.7 | 14 | 66.7 |
| Base of tongue | 10 | 13.9 | 2 | 9.5 | 4 | 19.0 |
| Oropharynx NS | 0 | 0 | 1 | 4.8 | 3 | 14.3 |
| T status | ||||||
| T1 | 17 | 23.6 | 6 | 28.6 | 6 | 28.6 |
| T2 | 36 | 50.0 | 11 | 52.4 | 12 | 57.1 |
| T3 | 13 | 18.1 | 4 | 19 | 3 | 14.3 |
| T4 | 6 | 8.3 | 0 | 0 | 0 | 0 |
| N status | ||||||
| N0 | 1 | 1.4 | 4 | 19 | 1 | 4.8 |
| N1 | 15 | 20.8 | 17 | 81 | 16 | 76.2 |
| N2 | 53 | 73.6 | 0 | 0 | 4 | 19.0 |
| N3 | 3 | 4.2 | 0 | 0 | 0 | 0 |
| Stage 8th edition of AJCC | ||||||
| I | 46 | 63.9 | 17 | 81 | 15 | 71.4 |
| II | 13 | 10.1 | 4 | 19 | 6 | 28.6 |
| III | 5 | 6.9 | 0 | 0 | 0 | 0 |
| IV | 8 | 19.1 | 0 | 0 | 0 | 0 |
| Stage 7th edition of AJCC | ||||||
| I | 0 | 0 | 1 | 4.8 | 1 | 4.8 |
| II | 0 | 0 | 3 | 14.3 | 2 | 9.6 |
| III | 18 | 25 | 4 | 19.0 | 1 | 4.8 |
| IV | 54 | 75 | 13 | 61.9 | 17 | 80.8 |
| HPV status | ||||||
| HPV+ | 63 | 87.5 | 21 | 100 | 21 | 100 |
| HPV- | 9 | 12.5 | 0 | 0 | 0 | 0 |
| Smoking history | ||||||
| Smoker | 22 | 30.6 | 7 | 34.4 | 9 | 42.9 |
| Ex-smoker | 25 | 34.7 | 5 | 23.8 | 2 | 9.5 |
| Non-smoker | 25 | 34.7 | 9 | 42.8 | 10 | 47.6 |