Carcinogenesis, Teratogenesis & Mutagenesis ›› 2019, Vol. 31 ›› Issue (3): 173-179.doi: 10.3969/j.issn.1004-616x.2019.03.001

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Involvement of differentially expressed miRNA in prognosis of pancreatic cancers

GAO Jie, ZHANG Xiao, WEI Chao   

  1. School of Public Health, Southeast University, Nanjing 210009, Jiangsu, China
  • Received:2018-12-14 Revised:2019-04-19 Online:2019-05-31 Published:2019-05-31

Abstract: OBJECTIVE:To analyze associations between differentially expressed miRNAs and development of pancreatic cancers, and to screen biomarkers which might be related to prognosis of pancreatic cancers. METHODS:Data of GSE32678 and GSE71533 datasets in Gene Expression Omnibus (GEO) were downloaded to screen differentially expressed miRNAs by using R language and the intersection of the three data sets were taken. Bioinformatics analysis tool was used to predict target genes of overlapping miRNAs, to perform functional analysis on the target genes,and to construct a protein interaction network (PPI),a miRNA-mRNA network,and a miRNA-mRNA-pathway network. The markers which were related to prognosis of pancreatic cancers were screened by using the expression and prognosis data of miRNAs of pancreatic cancer samples in the Cancer Genome Atlas (TCGA). RESULTS:A total of 22 overlapping miRNAs were screened,and hsamiR-30a-5p,hsa-miR-551a,and hsa-miR-375 were closely related to the prognosis of pancreatic cancer. The core miRNAs in the miRNA-mRNA network were hsa-miR-125b-5p,hsa-miR-221-3p,hsa-miR-31-5p, hsa-miR-222-3p and hsa-miR-10a-5p. CONCLUSION:Analysis of data of pancreatic cancers in the GEO and TCGA databases reveal that hsa-miR-30a-5p,hsa-miR-551a,and hsa-miR-375 significantly affected the prognosis of pancreatic cancers and could be used as markers for prognosis.

Key words: pancreatic cancer, miRNA, prognosis, GEO database, TCGA database

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