Table 1. Clinical and pathological parameters.
| Variable | No upstaging (N = 896) | Upstaging (N = 91) | P-value |
|---|---|---|---|
| Age (years), mean ± SD | 54.9 ± 12.6 | 58.6 ± 13.9 | 0.006 |
| Sex, no. (%) | 0.712 | ||
| Men | 647 (72.2) | 68 (74.7) | |
| Women | 249 (27.8) | 23 (25.3) | |
| BMI (kg/m2), mean ± SD | 24.6 ± 3.2 | 24.7 ± 3.1 | 0.651 |
| Clinical stage | < 0.001 | ||
| T1a | 798 (89.1) | 48 (52.7) | |
| T1b | 98 (10.9) | 43 (47.3) | |
| Symptoms (%) | 97 (10.8) | 21 (21.8) | 0.002 |
| Follow-up (months), mean ± SD | 48.2 ± 27.2 | 50.8 ± 32.4 | 0.752 |
| Pathological T stage (%) | N.A. | ||
| T1a | 499 (89.2) | ||
| T1b | 97 (10.8) | ||
| Histology (%) | 0.134 | ||
| Clear cell | 721 (80.5) | 69 (75.8) | |
| Papillary | 81 (9.0) | 7 (7.7) | |
| Chromophobe | 69 (7.7) | 11 (12.1) | |
| Other | 25 (2.8) | 4 (4.4) | |
| Fuhrman grade (%) | < 0.001 | ||
| 1 | 88 (9.8) | 1 (1.1) | |
| 2 | 553 (61.7) | 32 (35.2) | |
| 3 | 242 (27.0) | 50 (54.9) | |
| 4 | 11 (1.2) | 8 (8.8) | |
| Positive surgical margin, no. (%) | 33 (3.7) | 2 (2.2) | 0.764 |
| Pseudosarcomatous component, no. (%) | 2 (0.2) | 4 (4.4) | 0.001 |
SD: standard deviation; BMI: body mass index.