Survivin has been implicated as a potential prognostic marker in a wide range of malignant tumours. However, the prognostic impact of survivin in gastric cancer remains to be controversial and published data are sometimes heterogeneous. Thus, aim of this study was to review the literature by performing an electronical database search via PubMed and EMBASE to identify eligible studies that assessed the impact of survivin as prognostic marker and its association with clinicopathological variables. Database search until November 21st 2012 retrieved 20 studies comprising 2,695 gastric cancer patients that assessed expression of survivin by immunohistochemistry or RT-PCR analyses in gastric cancer specimens. Meta-analyses of clinicopathological variables revealed an association between the expression of survivin and the presence of lymph node metastases (pooled OR: 0.58; 95 % CI 0.35-0.96). In addition, a correlation between the expression of survivin and overall survival for patients with gastric cancer (pooled HR 1.93; 95 % CI 1.51-2.48) became evident. More importantly, we were able to exclude a severe heterogeneity (I(2) = 31 %) or publication bias for the survival analyses. Furthermore, one-way sensitivity analysis and subgroup analyses regarding the method used to detect survivin, the type of survival analysis, the study quality and whether information was provided regarding neoadjuvant therapy supported our initial results. In conclusion, this meta-analysis indicates the prognostic significance of survivin in patients with gastric cancer.
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