Prognostic value of vascular endothelial growth factor expression in patients with esophageal cancer: a systematic review and meta-analysis.

VEGF is a prime mediator of tumorigenesis and metastasis. Various studies assessing the prognostic value of VEGF in patients with esophageal cancer remain controversial. This study aims to comprehensively and quantitatively summarize the evidence on the suitability of VEGF to predict patients' survival.