| Explanatory Variable | Estimate | Standard Error | t-value | Pr (>|t|) |
| (Intercept) | 0.66026 | 1.46407 | 0.451 | 0.652743 |
| Hot spots | 4.1177 | 1.19623 | 3.442 | 0.000772 |
| Ki-67_biopsy | 0.10828 | 0.03714 | 2.915 | 0.004173 |
| Needle_length | 0.10363 | 0.05194 | 1.995 | 0.048073 |