Table 1.
Patient and tumour characteristics for AS and CA patients.
| AS (n = 143) | CA (n = 85) | P | |
|---|---|---|---|
| Mean age, year (SD) | 71 (9.2) | 66 (10.42) | < 0.001 |
| Male, n (%) | 90 (62.9) | 62 (72.9) | 0.160 |
| Mean BMI, kg/m2 (SD) | 28 (5.8) | 29 (5.5) | 0.734 |
| Mean ACCI score (SD) | 5.0 (2.5) | 3.7 (2.2) | < 0.001 |
| Mean initial creatinine, µmol/l (SD) | 92 (59.8) | 82 (20.4) | 0.139 |
| Non-kidney cancer status, n (%) | 0.648 | ||
| Never had cancer | 78 (54.5) | 49 (57.6) | |
| Current or former cancer | 56 (39.2) | 33 (38.8) | |
| Current or former metastasis | 9 (6.3) | 3 (3.5) | |
| Location, n (%) | 0.066 | ||
| Right | 70 (49.0) | 39 (45.9) | |
| Left | 62 (43.4) | 46 (54.1) | |
| Bilateral/Multiple | 11 (7.7) | 0 (0.0) | |
| Initial tumour size, mm (SD) | 15 (10.4) | 23 (8.3) | < 0.001 |
| Initial biopsy, n (%) | 41 (28.7) | 85 (100) | < 0.001 |
| Histology, n (%) | < 0.001 | ||
| Clear cell | 4 (9.8) | 43 (50.6) | |
| Chromophobe | 3 (7.3) | 4 (4.7) | |
| Papillary | 7 (17.1) | 28 (32.9) | |
| Other histology | 5 (12.2) | 10 (11.8) | |
| Non-diagnostic biopsy | 22 (53.7) | 0 (0.0) | |
| Mean follow-up time, months (SD) | 23 (18.5) | 14 (6.4) | < 0.001 |
SD: standard deviation; BMI: body mass index; ACCI: age-adjusted charlson comorbidity index score.