Table 4 Univariate and multivariate Cox regression analyses for overall survival in ovarian serous carcinomas
| Â | Univariate | Multivariate | ||
|---|---|---|---|---|
HR (95% CI for HR) | p-value | HR (95% CI for HR) | p-value | |
Stromal PD-L1 | ||||
 Low expression | 1 [reference] |  | 1 [reference] |  |
 High expression | 0.401 (0.183–0.883) | 0.002 | 0.259 (0.09–0.739) | 0.012 |
Residual tumor | ||||
 Optimal | 1 [reference] |  | 1 [reference] |  |
 Suboptimal | 2.389 (1.109–5.143) | 0.026 | 2.294 (1.046–5.033) | 0.038 |
Tumor grade | ||||
 Grade 1 | 1 [reference] |  | 1 [reference] |  |
 Grade 2 | 8.703 (1.198–63.22) | 0.033 | 3.327 (0.448–24.73) | 0.240 |
 Grade 3 | 5.84 (0.783–43.55) | 0.085 | 3.041 (0.396–23.35) | 0.285 |
Tumor stage | ||||
 Early stage | 1 [reference] |  | 1 [reference] |  |
 Advanced stage | 15.39 (2.116–111.9) | 0.007 | 12.27 (1.666–90.39) | 0.014 |