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. 2017 Feb 22;8(18):30175–30189. doi: 10.18632/oncotarget.15621

Figure 1. Tumor PD-L1 expressed at different levels in ESCC specimens.

Figure 1

A. PD-L1 negative; B. ≥1% PD-L1-positive tumor cells with membrane staining of any intensity; C. ≥5% PD-L1-positive tumor cells with membrane staining of any intensity; D. ≥25% PD-L1-positive tumor cells with membrane staining of at least 2+ intensity.