Table 2.

Cox proportional hazard regression analysis for the association between PD-L1 expression in tumour, molecular subtypes and PFS adjusted for age.

	HR	95% CI	P
High PD-L1 expression	3.361	1.39–8.13	0.007
Molecular subtypes			0.025
Luminal B	3.152	1.10–9.00	0.032
HER positive	4.677	1.46–14.97	0.009
Triple-negative	4.045	1.27–12.92	0.018