Patient Demographics and Clinical Characteristics
| Variable | Data |
| Sex | |
| Male | 9 (69.2) |
| Female | 4 (30.8) |
| Age (y) | 63 (51–71) |
| Nephrectomy | |
| Yes | 11 (84.6) |
| No | 2 (15.4) |
| Histology | |
| Pure clear cell | 12 (92.3) |
| Mixed | 1 (7.7) |
| World Health Organization performance | |
| 0 | 4 (30.8) |
| 1 | 2 (15.4) |
| 2 | 7 (53.8) |
| Tumor sites | |
| Number | 4 (2–7) |
| Kidney | 6 (46.2) |
| Primary | 2 (15.4) |
| Local recurrence | 2 (15.4) |
| Contralateral | 2 (15.4) |
| Lung | 9 (69.2) |
| Lymph node | 7 (53.8) |
| Bone | 6 (46.2) |
| Liver | 5 (38.5) |
| Adrenal | 4 (30.8) |
| Muscle | 4 (30.8) |
| Other | 10 (76.9) |
| Previous treatment | |
| Tyrosine kinase inhibitor | 8 (61.5) |
| Tyrosine kinase inhibitor and interferon alfa ± bevacizumab | 2 (15.4) |
| Other | 3 (23.1) |
Qualitative data are expressed as number followed by percentage in parentheses; continuous data are expressed as median followed by range in parentheses.