Table 1.
Patient, tumour characteristics and histopathological findings
| All PM patients | Diagnostic PM + QEII patients | |
|---|---|---|
| Patients | 423 | 752 |
| Diagnostic biopsies | 357 | |
| Non-diagnostic, n (%) | 66 (16) | 0 |
| Male, n (%) | 278 (66) | 447 (59) |
| Age at surgery or biopsy, median (range) | 65 (32–91) | 63 (24–91) |
| Incidental, n (%) | 288 (68) | 563 (75) |
| Symptomatic, n (%) | 84 (20) | 146 (19) |
| Symptoms not available, n (%) | 51 (12) | 43 (6) |
| Tumour characteristics | ||
| Imaging tumour volume in cm3, median (range) | 8.7 (0–2252) | 13 (0.8–2252) |
| Endophytic %, median (range) | 50 (5–100) | 50 (1–100) |
| Tumour histology | ||
| Malignant, n (%) | 281 (79) | 631 (84) |
| Clear-cell RCC, n (%) | 167 (47) | 431 (57) |
| Papillary RCC, n (%) | 45 (13) | 113 (15) |
| Chromophobe RCC, n (%) | 14 (4) | 31 (4) |
| Malignant other (%) | 55 (15) | 56 (7) |
| Benign, n (%) | 76 (21) | 121 (16) |
| Oncocytoma, n (%) | 47 (13) | 67 (9) |
| Angiomyolipoma, n (%) | 16 (5) | 27 (4) |
| Benign cystic, n (%) | 1 (0) | 7 (1) |
| Metanephric adenoma, n (%) | 1 (0) | 6 (1) |
| Leiomyoma, n (%) | 0 | 1 (0) |
| Cystic nephroma, n (%) | 0 | 1(0) |
| Benign other, n (%) | 11 (3) | 12 (2) |
| TMN stage | ||
| T1a | 355 | 527 |
| T1b | 58 | 141 |
| T2a | 17 | 13 |
| T2b | 13 | 13 |
| T3a | 0 | 13 |
PM: Princess Margaret; QE: Queen Elizabeth; RCC: renal cell carcinoma.