An online KM plotter database using microarray dataset further showed that PD-L1 mRNA expression was not linked to OS in 1310 patients with ovarian cancer (227458_at: HR = 1.15, 95% CI = 0.94–1.41, P = 0.18; 223834_at: HR = 0.83, 95% CI = 0.66–1.04, P = 0.11) (Fig. 4). Here, CD274 is linked to ovarian cancer.