Table 1. Patient, tumor and follow-up characteristics.
| Variable | SEER Cohort (n = 36179) | Validation Cohort (n = 219) | ||
|---|---|---|---|---|
| No. | % | No. | % | |
| Age, years | ||||
| range (ME) | 15-96 (61) | 27-92 (62) | ||
| Race | ||||
| White | 30371 | 83.9 | 0 | 0 |
| Black | 3972 | 11.0 | 0 | 0 |
| Others | 1836 | 5.1 | 209 | 100 |
| Sex | ||||
| Female | 8828 | 24.4 | 82 | 37.4 |
| Male | 27351 | 75.6 | 137 | 62.6 |
| Tumor site | ||||
| Oral | 23696 | 65.5 | 167 | 76.3 |
| Larynx | 10949 | 30.3 | 38 | 17.4 |
| Nasal | 882 | 2.4 | 12 | 5.5 |
| Salivary | 652 | 1.8 | 2 | 0.9 |
| Grade | ||||
| I | 5482 | 15.1 | 23 | 10.5 |
| II | 18782 | 51.9 | 108 | 49.3 |
| III | 11609 | 32.1 | 84 | 38.4 |
| IV | 306 | 0.8 | 4 | 1.8 |
| T status | ||||
| T1 | 12821 | 35.4 | 46 | 21.0 |
| T2 | 10873 | 30.1 | 59 | 26.9 |
| T3 | 5438 | 15.0 | 82 | 37.4 |
| T4 | 7047 | 19.5 | 32 | 14.6 |
| N status | ||||
| N0 | 19173 | 53.0 | 96 | 43.8 |
| N1 | 5680 | 15.7 | 58 | 26.5 |
| N2 | 10389 | 28.7 | 36 | 16.4 |
| N3 | 937 | 2.6 | 29 | 13.2 |
| M status | ||||
| M0 | 35152 | 97.2 | 207 | 94.5 |
| M1 | 1027 | 2.8 | 12 | 5.5 |
| Surgery | ||||
| Performed | 18977 | 52.5 | 209 | 100 |
| None | 17202 | 47.5 | 0 | 0 |
| Radiotherapy | ||||
| Performed | 25852 | 71.5 | 153 | 69.9 |
| None | 10327 | 28.5 | 66 | 30.1 |
| Outcome | ||||
| Alive | 22323 | 61.7 | 131 | 59.8 |
| CSM | 9627 | 26.6 | 68 | 31.1 |
| DROP | 4229 | 11.7 | 20 | 9.1 |
Abbreviation: ME, median; Others, American Indian/Alaska Native/Asian/Pacific Islander; CSM, cancer-specific mortality; DROP, death resulting from other causes.