Table 4.

Univariate and multivariate Cox regression analyses for overall survival in ovarian serous carcinomas

	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