Table 4.
Univariate and multivariate analysis for radiographic predictors of Local Control (LC) for SBRT patients
| Univariate | Multivariate | ||
|---|---|---|---|
| Variable | P-value | HR (95 % CI) | P-value |
| Total Dose (Gy) | 0.772 | 0.999 (0.997 to 1.001) | 0.608 |
| Number of Fractions | 0.789 | 1.086 (0.528 to 2.233) | 0.822 |
| Dose per Fractions (≥9 Gy) | 0.474 | 0.835 (0.528 to 1.319) | 0.442 |
| BED (100 Gy) | 0.534 | 0.988 (0.957 to 1.019) | 0.461 |
| Site (Thorax vs Other) | 0.961 | 0.948 (0.915 to 1.012) | 0.957 |
| GTV | 0.429 | 0.958 (0.921 to 1.091) | 0.967 |
| PTV | 0.429 | - | - |
| Time from Primary Diagnosis | 0.491 | 1.224 (0.645 to 2.320) | 0.537 |
| Age | 0.701 | 1.063 (0.885 to 1.277) | 0.513 |
| Smoker | 0.965 | - | - |
| Greater than 5 Metastatic Lesions | 0.963 | - | - |
| Pre-Radiation Systemic Therapy | 0.959 | - | - |
| Post-Radiation Systemic Therapy | 0.961 | - | - |
BED biologic effective dose, GTV gross tumor volume, HR hazard ration, CI confidence interval