Table 3.
Kaplan-Meier Analysis of potential predictive factors on LC following SBRT
| Variable | Number of Lesions | 1-year LC rate (95%CI) | p-value |
| BED7 | |||
| < 85 Gy7 | 42 | 92.2% (71.5-98.0%) |
0.99 |
| ≥ 85 Gy7 | 29 | 82.3% (55.8-94.2%) |
|
| < 100 Gy7 | 47 | 92.3% (73.7-98.2%) |
0.75 |
| ≥ 100 Gy7 | 24 | 80.1% (51.1-93.4%) |
|
| < 125 Gy7 | 55 | 87.2% (69.0-95.1%) |
0.44 |
| ≥ 125 Gy7 | 16 | 91.7% (53.9-98.8%) |
|
| Fractionation | 0.83 | ||
| Single Fraction | 15 | 87.5% (38.7-98.1%) |
|
| Multiple Fractions | 56 | 88.5% (71.8-95.6%) |
|
| Dose per fraction | |||
| < 10 Gy | 31 | 95.8% (73.9-99.4%) |
0.84 |
| ≥ 10 Gy | 40 | 82.4% (59.5-93.0%) |
|
| < 15 Gy | 42 | 87.3% (64.8-95.8%) |
0.40 |
| ≥ 15 Gy | 29 | 89.6% (64.3-97.3%) |
|
| Location | |||
| Osseous Metastases | 42 | 89.2% (69.8-96.5%) |
0.93 |
| Non-Osseous Metastases | 29 | 86.7% (56.4%-96.5%) |
|
| Bone (Excluding Spine) | 24 | 91.3% (69.5-97.8%) |
|
| Lung | 21 | 83.5% (64.4-92.9%) |
|
| Age | 0.054 | ||
| < 65 years | 31 | 100% (N/A) | |
| ≥ 65 years | 40 | 76.1% (51.0-89.5%) |
|
| GTV | 0.51 | ||
| < 25 cc | 18 | 100% (N/A) | |
| ≥ 25 cc | 53 | 84.4% (66.2 – 93.3%) |
|
| Initial KPS | 0.43 | ||
| < 80% | 13 | 100% | |
| ≥ 80% | 58 | 86.9% (71.0-94.3%) |