5.
Factor | P | RR | 95%CI |
Primary tumor radiotherapy | 0.005 | 0.647 | 0.477-0.876 |
Prophylactic cranial irradiation | < 0.001 | 0.397 | 0.253-0.624 |
Metastasis local treatment site | 0.001 | 0.609 | 0.453-0.818 |
Metastasis local treatment timing | 0.374 | 1.116 | 0.876-1.422 |