Table 3.
Patient and tumour characteristics in patients with a diagnostic first renal mass biopsy vs non-diagnostic biopsy
| First biopsy diagnostic (n = 81) | First biopsy non-diagnostic (n = 14) | p-value | |
| Male/female | 48/33 | 7/7 | 0.52c |
| Mean age (95% CI) | 63.5 (60.4–66.6) | 68.0 (60.7–75.3) | 0.32d |
| Right/left | 39/42 | 5/9 | 0.39c |
| Needle gauge (18G/20G)a | 64/13 | 8/5 | 0.13b |
| Image guidance (CT/ultrasound) | 51/30 | 11/3 | 0.37b |
| Tumour location | |||
| Upper pole | 19 | 8 | 0.04b |
| Interpolar | 39 | 5 | |
| Lower pole | 23 | 1 | |
| Exophytic/endophytic | |||
| ≥50% exophytic | 33 | 6 | 0.23b |
| <50% exophytic | 28 | 2 | |
| Endophytic | 20 | 6 | |
| Centrality | |||
| ≥7 mm from collecting system/sinus | 31 | 5 | 1.0c |
| >4 but ≤7 mm from collecting system/sinus | 15 | 3 | |
| ≤4 mm from collecting system/sinus | 35 | 6 | |
| Anterior/posterior | |||
| Anterior | 17 | 11 | <0.01b |
| Posterior | 52 | 2 | |
| Neither | 12 | 1 | |
CI, confidence interval.
a
Data on needle gauge size were not available for all cases.
b
Fisher’s exact test.
c
X2 test.
d
Mann–Whitney U test.