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Examples of PD-L1 immunohistocehmistry staining in NSCLC tumor specimens. PD-L1 staining is evident from the presence of the chromogranin (brown); the counterstain is hematoxylin (blue). PD-L1 strong positivity and weak positivity were defined as traceable to the clinical trial version of the assay, which is currently used in the pembrolizumab clinical trials.
