Survivin over-expression is correlated with a poor prognosis in esophageal cancer patients

Abstract

BackgroundThe prognostic role of survivin in esophageal cancer (EC) remains controversial. This meta-analysis aimed to clarify the association of survivin with survival in EC patients. MethodsRelevant studies published up to November 2014 were identified using PubMed and Embase. Only studies in which survivin was detected through immunohistochemical staining were included. STATA 12.0 was used in this meta-analysis. ResultsA total of 9 studies, which comprised 610 patients, were included in the meta-analysis. The combined hazard ratio (HR) of 1.76 (95% CI, 1.40–2.21; P<0.001) suggests that survivin overexpression in EC patients was significantly associated with poor overall survival. Moreover, the results showed a significant relationship between overall survival and survivin expression was also displayed in studies with a non-Asian country (HR, 1.75; 95% CI, 1.30–2.35), patient number ≥50 (HR, 1.86; 95% CI, 1.57–2.20), the cut-off level ≥5% (HR, 1.43; 95% CI, 0.94–2.17) and the esophageal squamous cell carcinoma (HR, 1.82; 95% CI, 1.43–2.30). However, combined odds ratio of survivin indicated that survivin overexpression has no correlation with stage, grade of differentiation, lymph node status, depth of invasion and distant metastasis of EC (P>0.05). ConclusionSurvivin overexpression is associated with poor prognosis in EC patients.