title: Identification of a prognostic 5-Gene expression signature for gastric cancer.
abstract: OBJECTIVE
  Gastric cancer (GC) is a major tumor throughout the world with remaining high morbidity and mortality. The aim is to generate a gene model to assess the prognoses risk of patients with GC.
  
  
  METHODS
  Gene expression profiling of gastric cancer patients, GSE62254 (300 samples) and GSE26253 (432 samples), was downloaded from Gene Expression Omnibus (GEO) database. Univariate survival analysis and LASSO (Least Absolute Shrinkage and Selectionator operator) (1000 iterations) of differentially expressed genes in GSE62254 was assessed using survival and glmnet in R package, respectively. Kaplan-Meier analysis on the clustering algorithm from each regression model was performed to calculate the influence to the prognosis. Random samples in GSE26253 were analyzed in multivariate and univariate survival analysis for one thousand times to calculate statistical stability of each regression model.
  
  
  RESULTS
  A total of 854 Genes were identified differentially expressed in GSE62254, among which 367 Genes were found influencing the prognoses. Six gene clusters were selected with good stability. Hereinto, five or more genes in 11-Gene model, TRPC1, SGCE, TNFRSF11A, LRRN1, HLF, CYS1, PPP1R14A, NOV, NBEA, CES1 and RGN, was available to evaluate the prognostic risk of GC patients in GSE26253 (P = 0.00445). The validity and reliability was validated.
  
  
  CONCLUSIONS
  In conclusion, we successfully generated a stable 5-Gene model, which could be utilized to predict prognosis of GC patients and would contribute to postoperational treatment and follow-up strategies.
authors.affiliation: Department of Gastroenterology, Shanghai Sixth People's Hospital East Affiliated to Shanghai University of Medicine & Health Sciences, Shanghai, 201306, China.
authors.forename: Jun-Yi
authors.initials: JY
authors.lastname: Hou
authors.affiliation: Department of Gastroenterology, Shanghai Tongren Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
authors.forename: Yu-Gang
authors.initials: YG
authors.lastname: Wang
authors.affiliation: Department of Gastroenterology, Huai'an First People's Hospital, Nanjing Medical University, Huai'an, Jiangsu, China.
authors.forename: Shi-Jie
authors.initials: SJ
authors.lastname: Ma
authors.affiliation: Department of Gastroenterology, The Second People's Hospital of Huai'an and The Affiliated Huai'an Hospital of Xuzhou Medical University, Huai'an, 223002, China. yang_prof@163.com.
authors.forename: Bing-Yin
authors.initials: BY
authors.lastname: Yang
authors.affiliation: Department of Cardiothoracic Surgery, Shanghai Sixth People's Hospital East Affiliated to Shanghai University of Medicine & Health Sciences, Shanghai, 201306, China. lqpshai@aliyun.com.
authors.forename: Qian-Ping
authors.initials: QP
authors.lastname: Li
mesh_terms: D020869:Gene Expression Profiling; D006801:Humans; D011379:Prognosis; D012307:Risk Factors; D013274:Stomach Neoplasms / Q000235:genetics*; D016019:Survival Analysis
keywords: Gastric cancer; Kaplan–Meier; LASSO; Prognosis; Survival analysis