Table 1 Summary of clinical and pathological features (study population n = 520)
Feature | Â | Number of cases | % of cases |
|---|---|---|---|
Sex | Â | Â | Â |
| Â | Male | 320 | 61.5 |
| Â | Female | 200 | 38.5 |
Age at surgery | Â | Â | |
| Â | < 65 years | 295 | 56.7 |
|  | ≥ 65 years | 225 | 43.3 |
Karnofsky perfomance status scale | Â | Â | |
|  | ≥ 80% | 476 | 91.5 |
| Â | < 80% | 44 | 8.5 |
Tumor extent (Robson) | Â | Â | |
| Â | Stage I | 310 | 59.6 |
| Â | Stage II | 37 | 7.1 |
| Â | Stage III | 83 | 16.0 |
| Â | Stage IV | 90 | 17.3 |
Regional lymph node metastasis | Â | Â | |
| Â | N0/pN0 | 481 | 92.5 |
| Â | pN+ | 39 | 7.5 |
Distant metastasis | Â | Â | |
| Â | M0 | 433 | 83.3 |
| Â | M+ | 87 | 16.7 |
Fuhrman grade | Â | Â | |
| Â | G1/G2 | 417 | 80.2 |
| Â | G3/G4 | 98 | 18.8 |
| Â | Unclassified | 5 | 1.0 |
Histopathological subtype | Â | Â | |
| Â | Clear cell RCC | 422 | 81.1 |
| Â | Papillary (chromophilic) RCC | 55 | 10.6 |
| Â | Chromophobe RCC | 23 | 4.4 |
| Â | Duct bellini | 3 | 0.6 |
| Â | Unclassified RCC | 17 | 3.3 |