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| Hazard ratio | CI 95% | P -value | |
|---|---|---|---|
| Karnofsky performance score at first diagnosis of BM | 0.07 | 0.01–0.50 | 0.01 |
| Number of BM | 0.13 | 0.04–0.50 | 0.003 |
| ER expression | 0.49 | 0.22–1.1 | 0.78 |
Abbreviations: BM=brain metastases; BO-MBC=brain-only metastatic breast cancer; CI=confidence interval; ER=oestrogen receptor.
