Table 2. Multivariable COX analysis of prognostic factors for CSS.
| Variables | HR (95% CI) | P | β |
|---|---|---|---|
| Basic disease (yes vs. no) | NA | 0.328 | – |
| AJCC T stage (T3/T4 vs. T1/T2) | NA | 0.719 | – |
| AJCC N stage (N1/N2 vs. N0) | 1.652 (1.055–2.587) | 0.028 | 0.502 |
| CEA levels at BM diagnosis (positive vs. negative) | NA | 0.367 | – |
| CA199 levels at BM diagnosis (positive vs. negative) | 1.460 (1.061–2.009) | 0.020 | 0.379 |
| ALP levels at BM diagnosis (positive vs. negative) | NA | 0.827 | – |
| Bone involvement (multiple vs. solitary) | 1.534 (1.117–2.105) | 0.008 | 0.428 |
| KPS at BM diagnosis (<80 vs. ≥80) | 1.527 (1.071–2.176) | 0.019 | 0.423 |
| Extra-osseous metastases (yes vs. no) | NA | 0.101 | – |
| Primary tumor resection (yes vs. no) | 0.627 (0.429–0.916) | 0.016 | 0.467 |
| Bisphosphonates for BM (yes vs. no) | 0.581 (0.429–0.788) | 0.000 | 0.542 |
| Radiotherapy for BM (yes vs. no) | 0.578 (0.407–0.822) | 0.002 | 0.548 |
Italic values indicate statistical significance at P<0.05. CSS, cancer specific survival; CI, confidence interval; HR, hazard ratio; β, beta coefficients; NA, not available; CEA, carcinoembryonic antigen; CA199, carbohydrate antigen 199; ALP, alkaline phosphatase.