Systematic analysis of gene expression alteration of BIRC5/survivn in gastric cancer

353 Background: BIRC5/survivin gene is a member of the inhibitor of apoptosis (IAP) gene family, which encode negative regulatory proteins that prevent apoptotic cell death. Abnormal BIRC5/survivin expression is associated with carcinogenesis. Methods: We used sequencing data from The Cancer Genome Atlas database，Oncomine database and GTEx database, analyzed BIRC5/survivin expression and gene regulation networks in gastric carcinoma (STAD).Kaplan-Meier plotter database was used to assess the BIRC5/survivin prognostic potential. ULACAN was used to further analyze the relationship between the expression of BIRC5/survivin and the clinical stage of gastric cancer, and the methylation data of the promoter region of BIRC5/survivin. LinkedOmics was used to identify differential gene expression with BIRC5/survivin and to analyze Gene Ontology and Kyoto Encyclopedia of Genes and Genomes pathways. Gene enrichment analysis examined target networks of kinases, miRNAs and transcription factors. We investigated the correlation of BIRC5/survivin expression in gastric cancer with immune infiltration levels from TIMER database and TISID database. Results: We found that BIRC5/survivin is overexpressed in gastric cancer. The patient with high expression of this gene is associated with poor prognosis. The expression of BIRC5/survivin is positive with ERBB2 expression,TMB,MSI,MSH2,MSH6,PMS2.BIRC5/surviving expression is significantly positively correlated to tumor purity and has significant negative correlation with the immune cell infiltration level of B cells,CD8+T cells,CD4+T cells, Macrophage cells, Neutrophil cells and Dendritic cells. BIRC5/survivin expression is significantly positively correlated CD274，LAG3 and PDCD1. Our results show a detailed landscape map of BIRC5/survivin gene mutation in STAD. Our results showed the associations between BIRC5/survivin expression and six immune subtypes: C1 (wound healing); C2 (IFN-gamma dominant);C3 (inflammatory); C4 (lymphocyte depleted); C6 (TGF-b dominant) in STAD. Conclusions: Our results demonstrate that data mining efficiently reveals information about BIRC5/survivin expression and potential regulatory networks in gastric cancer, laying a foundation for further study of the role of BIRC5/survivin in carcinogenesis and tumor immunotherapy.