CD274 and neoplasm: The proportion of PD-L1-positive tumor cells in patients of the PR group was 18.66% (95% CI:12.37%–24.94%), which was significantly higher compared to those in patients of the PD group (2.21%, 95% CI: 1.67%–2.75%, p < 0.001, Kruskal–Wallis test, Figure 5A).