Table 3. Prognostic factors for LC at irradiated sites.
| Factor | n | 5-y LC | P value |
|---|---|---|---|
| Site of irradiated metastasis | |||
| Bone | 166 | 79% | .65 |
| Soft tissue | 78 | 85% | |
| No. of bony sites of involvement at diagnosis | |||
| ≤5 | 102 | 83% | |
| >5 | 141 | 80% | .84 |
| Persistent disease in metastatic site after induction chemotherapy (bone and soft tissue) | |||
| Yes | 107 | 67% | |
| No | 137 | 92% | <.0001 |
| Persistent bone disease after induction chemotherapy | |||
| Yes | 88 | 66% | <.0001 |
| No | 78 | 93% | |
| Persistent soft tissue disease after induction chemotherapy | |||
| Yes | 18 | 71% | .13 |
| No | 60 | 91% | |
| Site of bone involvement | |||
| Skull and/or orbit | 76 | 86% | .36 |
| Extremity | 59 | 70% | |
| Pelvis | 10 | 77% | |
| Spine | 18 | 81% | |
| Other | 3 | 100% | |
| RT dose | |||
| <21 Gy | 15 | 88% | .02 |
| 21-24 Gy | 212 | 83% | |
| 30 Gy | 9 | 50% | |
| 36 Gy | 8 | 50% | |
Abbreviations: LC = local control; RT = radiation therapy.