Fig. 1From: The clinical association of programmed cell death protein 4 (PDCD4) with solid tumors and its prognostic significance: a meta-analysisPreferred reporting items for systematic reviews and meta-analyses (PRISMA) flow diagram showing the literature search strategy and review process. In total, 493 articles were found from three databases; after multiple-step selection, 23 eligible articles were finally included in the meta-analysisBack to article page