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Expression of hypoxia-inducible factor (HIF)-1alpha and vascular endothelial growth factor (VEGF)-D as outcome predictors in resected esophageal squamous cell carcinoma.
Disease Markers 2008
Hypoxia-inducible factor (HIF)-1alpha and vascular endothelial growth factor (VEGF) are important angiogenic factors in human cancers. Relative to VEGF-C, prognostic significance of VEGF-D expression and its association with HIF-1alpha expression remain elusive in esophageal squamous cell cancer (ESCC). We studied expression of HIF-1alpha and VEGF-D using immunohistochemistry in 85 resected ESCC specimens and correlated results with patients' clinicopathologic parameters and survival. Association between expression of HIF-1alpha and VEGF-D was investigated using a concordance analysis. High expression of HIF-1alpha and VEGF-D was observed in 52 (61.2%) and 56 (65.9%) patients, respectively. HIF-1alpha expression correlated well with tumor stage (P = 0.041), whereas VEGF-D expression correlated with tumor stage (P = 0.027) and N status (P = 0.019). Groups of high HIF-1alpha and VEGF-D showed worse survivals than those of low expression (P = 0.002 and 0.001, respectively). Multivariate analysis supported expression of HIF-1alpha and VEGF-D as significant survival predictors (P = 0.044 and 0.035, respectively). A concordance rate of 69.5% was observed between expression of HIF-1alpha and VEGF-D. In conclusion, protein expression of HIF-1alpha and VEGF-D are independent prognostic predictors. An association between expression of HIF-1alpha and VEGF-D suggests that these two angiogenic factors are essential in progression of ESCC.
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