3.

PD-L1在SCLC外周血和H446细胞中的表达及分布。A：左图，外周血单个核细胞群（R1门）；右图，R1门中PD-L1水平；B：左图，CD3⁺ T细胞群（R2门）；右图，R2门中PD-L1水平；C：PD-L1在H446表达（FACS法）；D：PD-L1在H446细胞中表达（ICC法）。PC-3细胞为阴性对照。FACS：流式细胞术；ICC：免疫细胞化学法。

Distribution and expression of PD-L1 in peripheral blood of SCLC patients and H446 cells. A: Left, mononuclear cells in peripheral blood (Gate R1); Right, Level of PD-L1 in Gate R1; B: Left, CD3⁺ T cells (Gate R2); Right, PD-L1 in Gate R2; C: The expression of PD-L1 in H446 cells (FACS); D: PD-L1 expression in H446 cells (ICC) with PC-3 cell as negative control. FACS: flow cytometry; ICC: immunocytochemical method.