Table 1. Demographic and pathological characteristics of the study subjects.
| Characteristic | Case-control study |
Survival analysis | ||
|---|---|---|---|---|
| RCC cases (%) N = 417 | Controls (%) N = 855 | P | RCC cases (%) N = 309 | |
| Age (years) | ||||
| Mean ± SD | 56.82 ± 12.85 | 58.44 ± 15.24 | 0.543 | 56.88 ± 13.06 |
| ≤60 | 258 (61.87) | 544 (63.63) | – | 190 (61.49) |
| >60 | 159 (38.13) | 311 (36.37) | – | 119 (38.51) |
| Gender | ||||
| Male | 281 (67.39) | 609 (71.23) | 0.161 | 216 (69.90) |
| Female | 136 (32.61) | 246 (28.77) | – | 93 (30.10) |
| Histology | ||||
| Clear cell | 368 (88.25) | – | – | 274 (88.67) |
| Papillary | 13 (3.12) | – | – | 11 (3.56) |
| Chromophobe | 10 (2.40) | – | – | 8 (2.59) |
| Unclassified | 26 (6.24) | – | – | 16 (5.18) |
| AJCC stage | ||||
| I–II | 373 (89.45) | – | – | 266 (86.08) |
| III–IV | 44 (10.55) | – | – | 43 (13.92) |
Abbreviation: AJCC = American Joint Committee on Cancer; RCC = renal cell carcinoma.