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Cox proportional hazard model: Prediction of OS
| Factor | p = | OR | 95% CI |
|---|---|---|---|
| Age < 35 years | 0.083 | 2.1 | 0.91-4.86 |
| Positive hormone receptor status | 0.075 | 0.61 | 0.36-1.05 |
| Number of metastatic sites (1 versus 2) | 0.053 | 4.2 | 1.74-1.01 |
| Development of brain metastases | 0.292 | 1.35 | 0.77-2.37 |
| Early development of brain metastases | 0.001 | 3.83 | 1.68-8.71 |
