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Background
The expression of programmed cell death ligand‐1 (PD‐L1) is a biomarker in patients with non‐small‐cell lung carcinoma (NSCLC). Patients with advanced‐stage NSCLC receive a variety of molecular genetic tests, possibly resulting in insufficient tissue for immunoassay of PD‐L1. Thus, to determine whether effusion fluid specimens are a reliable alternative to tissue specimens for PD‐L1 testing,...
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