Main characteristics of 22 eligible studies in the meta-analysis.

Abstract

<p>IHC, immunohistochemistry; ELISA, enzyme linked immunosorbent assay; AC, adenocarcinoma; SCC, squamous cell carcinoma; Non-SCC, not squamous cell carcinoma; HR, hazard ration; ED, extensive-stage disease; LD, limited-disease stage; NA, not applicable; NSCLC, non-small cell lung cancer; SCLC, small cell lung cancer.</p

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