Table 1.
Baseline Patient Characteristics
| Patient characteristic | n (%) |
|---|---|
| Patients | 4881 |
| Age at diagnosis, years, median (range) | 40 (18–54) |
| Age category | |
| 18–44 | 3167 (66%) |
| 45–54 | 1714 (35%) |
| Sex | |
| Female | 3568 (73%) |
| Male | 1313 (27%) |
| Histology | |
| Papillary | 4677 (96%) |
| Follicular (includes Hürthle cell carcinoma) | 204 (4%) |
| T stage | |
| T1 | 2181 (45%) |
| T2 | 999 (21%) |
| T3 | 1114 (23%) |
| T4 | 295 (6%) |
| Insufficient data | 292 (6%) |
| N stage | |
| N0/Nx | 3167 (65%) |
| N1 | 1571 (32%) |
| Insufficient data | 143 (3%) |
| M stage | |
| M0 | 4797 (98%) |
| M1 | 84 (2%) |
| Extrathyroidal extension | |
| None | 3224 (66%) |
| Microscopic | 1016 (21%) |
| Gross | 286 (6%) |
| Insufficient data | 355 (7%) |
| AJCC/TNM stage (< 55) | |
| I | 4797 (98%) |
| II | 84 (2%) |
| ATA risk of recurrence | |
| Low | 1799 (37%) |
| Intermediate | 2692 (55%) |
| High | 390 (8%) |
| Follow-up, years, median (range) | 6.6 (2–35) |
| Died of any cause | 229 (5%) |
| Disease-related death | 122 (2.5%) |
| Time to death, years, median (range) | 9.1 (2–34) |
AJCC, American Joint Committee on Cancer; TNM, tumor-node-metastasis; ATA, American Thyroid Association.