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Abstract
Background/Aims
MicroRNA (miRNA) regulates messenger RNA stability and translation. In cancer biology, miRNA affects the growth and metastasis of cancer cells by controlling epithelial-mesenchymal transition (EMT). MiR-200 family (200a/200b/ 200c/141) and miR-205 are associated with the regulation of EMT. We investigated the prognostic role of EMT-related miRNAs in pancreatic cancer.
Methods
We analyzed miR-200 family and miR-205 expression in tissue samples of 84 patients who underwent radical resection for pancreatic cancer.
Results
Patients were followed from the date of diagnosis until death or censoring. The mean overall survival was 25.0±2.0 months (2–140 months). The R0 resection rate was obtained in 84.5% (n=71) of patients. The relative expressions of miR-200a/200b/200c/141 and miR-205 were 266.9±57.3/18.5±2.2/0.7±0.1/27.2±6.6 folds and 0.1±0.1 compared with human pancreatic ductal epithelial cells, respectively. Overall survival was longer in the low miR-200c expression group than in the high expression group (35 vs. 19 months, p=0.013). Multivariate analysis confirmed that patients with low miR-200c expression survived longer than the high expression group (hazard ratio, 1.771; 95% CI, 1.081–2.900; p=0.023). There was a trend toward longer disease-free survival in low miR-200c group without statistical significance (p=0.061).
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Fig. 1.
Overall survival (p=0.013) (A) and disease-free survival (p=0.061) (B) according to the level of microRNA (miRNA)-200c.
Table 1.
The MicroRNA (miRNA) Primer Sequences for Quantitative Real-time PCR Analysis
Table 2.
Baseline Characteristics of 84 Resected Pancreatic Cancer Patients
Table 3.
MicroRNA (miRNA) Expression Levels in Pancreatic Cancer Tissue Comparing with Immortalized Pancreatic Duct Epithelial Cells
| miRNA | HPDE cells | Mean±SEM |
|---|---|---|
| miRNA-200a | 1 | 266.9±57.3 |
| miRNA-200b | 1 | 18.5±2.2 |
| miRNA-200c | 1 | 0.7±0.1 |
| miRNA-141 | 1 | 27.2±6.6 |
| miRNA-205 | 1 | 0.1±0.1 |
Table 4.
Prognostic Factors of Pancreatic Cancer
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