Table 1.
The background of the subjects
| Characteristics of primary cancer | Number (N = 56) | Characteristics of metastatic lesion | Number (N = 56) |
|---|---|---|---|
| Gender | Age median (range) | 53.1 (18.0–81.0) | |
| Male | 29 | Number of tumors median (range) | 2.8 (1.0–23.0) |
| Female | 27 | Largest tumor size median (range) | 2.5 (0.4–7.5) |
| Site of primary | Laterality | ||
| Larynx | 4 | Unilateral | 38 |
| Nasopharynx | 18 | Bilateral | 18 |
| Oral cavity | 8 | Operation | |
| Salivary gland | 7 | Sternotomy | 1 |
| Thyroid | 19 | Thoracotomy | 43 |
| Histology | VATS*** | 12 | |
| Papillary | 19 | Margins | |
| SCC* | 16 | Negative | 56 |
| ACC** | 11 | Positive | 0 |
| Undifferentialted | 8 | Chemoradiotherapy for the primary cancer | |
| Myoepithelial | 2 | Yes | 34 |
| Disease-free interval | No | 22 | |
| < 1 year | 18 | Recurrence of Mets | |
| 1–2 years | 6 | Yes | 32 |
| > 2 years | 32 | No | 24 |
*Squamous cell carcinoma
**Adenoid cystic carcinoma
***Video-assisted thoracoscopic surgery