MicroRNA miR-17-5p is overexpressed in pancreatic cancer, associated with a poor prognosis, and involved in cancer cell proliferation and invasion

Cancer Biol Ther. 2010 Oct 15;10(8):748-57. doi: 10.4161/cbt.10.8.13083. Epub 2010 Oct 15.


The microRNA-17-92 cluster is an oncogene in human B cell lymphomas and lung cancers. Previous microRNA microarray data revealed that miR-17-5p, a member of the miR-17-92 cluster, is upregulated in pancreatic cancer. However, the involvement of miR-17-5p expression in pancreatic carcinogenesis has not well been studied. In the present study, we measured the miR-17-5p expression levels in pancreatic cancer cell lines, primary cultures of normal human pancreatic ductal cells, formalin-fixed paraffin-embedded (FFPE) tissue samples derived from 80 patients who underwent pancreatectomy for pancreatic cancer and microdissected cells (including normal ductal epithelial, pancreatic intraepithelial neoplasia-1B and invasive ductal carcinoma cells) by qRT-PCR. Furthermore, we investigated the effects of upregulation of miR-17-5p expression on the proliferation and invasion of pancreatic cancer cells. We found that pancreatic cancer cells expressed higher levels of miR-17-5p than primary cultured normal ductal cells. miR-17-5p was also overexpressed in pancreatic cancer in FFPE and microdissected samples. Furthermore, analysis of macrodissected FFPE samples revealed that high miR-17-5p expression was associated with a poor prognosis (p = 0.03). In addition, in vitro experiments revealed that SUIT-2 and KP-2 pancreatic cancer cells transfected with the miR-17-5p precursor showed significantly higher cell growth ratios than the corresponding control cells (p < 0.001 and p = 0.012, respectively), as well as significantly higher numbers of invading cells (p < 0.0001 for both). The present findings suggest that miR-17-5p plays important roles in pancreatic carcinogenesis and cancer progression, and is associated with a poor prognosis in pancreatic cancer.

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Cell Line, Tumor
  • Cell Proliferation*
  • Female
  • Gene Expression Regulation, Neoplastic*
  • Humans
  • Male
  • MicroRNAs / genetics*
  • Middle Aged
  • Multivariate Analysis
  • Neoplasm Invasiveness
  • Pancreatic Neoplasms / genetics*
  • Pancreatic Neoplasms / pathology
  • Paraffin Embedding
  • Prognosis
  • Reverse Transcriptase Polymerase Chain Reaction
  • Survival Analysis
  • Tissue Fixation


  • MIRN17 microRNA, human
  • MicroRNAs