title: MicroRNA-155 expression as a prognostic factor in patients with gallbladder carcinoma after surgical resection.
abstract: BACKGROUND
  MicroRNA-155 (miR-155) is over-expressed in both hematopoietic malignancies and solid tumors. In the present study, we investigated the clinical significance of miR-155 in gallbladder carcinoma among Chinese population.
  
  
  METHODS
  Tissue specimens were collected from 133 patients who had undergone surgical resection at Shandong Provincial Hospital, Shandong University between May 2008 and April 2014. We profiled miR- 155 expression in the gallbladder carcinoma tissues and normal gallbladder tissues by qRT-PCR. The Kaplan-Meier method was used to analyze the 5-year survival rate.
  
  
  RESULTS
  The expression levels of miR-155 were significantly higher in gallbladder carcinoma tissues than that in normal gallbladder tissues (P<0.001). High miR-155 expression was significantly associated with TNM stage (P=0.003), lymph node status (P=0.042), liver metastasis (P=0.010), and differentiated degree (P<0.001). We found that gallbladder carcinoma patients with high miR-155 expression level had distinctly shorter overall survival than patients with low miR-155 expression level (P=0.03). Multivariate analysis revealed that miR-155 expression level was independent prognostic factors for overall survival (HR=2.394, 95% CI: 1.568-10.034; P=0.009).
  
  
  CONCLUSIONS
  High miR-155 expression is a prognostic indicator for poor prognosis of patients with gallbladder carcinoma among Chinese population.
authors.affiliation: Department of General Surgery, Shandong Provincial Hospital, Shandong UniversityJinan 250021, Shandong, China; Department of General Surgery, Liaocheng People's HospitalLiaocheng 252000, Shandong, China.
authors.forename: Xue-Lin
authors.initials: XL
authors.lastname: Zhang
authors.affiliation: Department of General Surgery, Liaocheng People's Hospital Liaocheng 252000, Shandong, China.
authors.forename: Jun-Hong
authors.initials: JH
authors.lastname: Chen
authors.affiliation: Department of General Surgery, Shandong Provincial Hospital, Shandong University Jinan 250021, Shandong, China.
authors.forename: Cheng-Kun
authors.initials: CK
authors.lastname: Qin
keywords: expression; gallbladder carcinoma; microRNA-155; prognostic factor