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miRNA Expression Analyses in Prostate Cancer Clinical Tissues
Published on: September 8, 2015
MicroRNA expression profiling of diagnostic needle aspirates from surgical pancreatic cancer specimens
1Department of Surgery, The Catholic University of Korea, Seoul St. Mary's Hospital, Seoul, Korea.
Purpose:
MicroRNAs (miRNAs) have been widely investigated as potential biomarkers for several malignancies. To establish the feasibility of miRNA expression profiling of small biopsy samples of pancreatic cancers, we assessed expression profiles in freshly collected aspirates obtained immediately after surgical resection of the pancreas.
Methods:
We used separate fine needles (20-23 gauge) to aspirate the pancreatic cancer and adjacent normal pancreatic tissue. miRNAs that were differentially expressed in pancreatic cancers and matched paraneoplastic normal pancreatic tissues were identified using an miRNA microarray.
Results:
We identified 158 aberrantly expressed miRNAs in pancreatic cancers; 51 were overexpressed and 107 underexpressed compared with normal pancreatic tissue. To confirm the microarray findings, quantitative RT-PCR was performed on individual samples. We chose eight miRNAs for further analysis; of which five were overexpressed (miR-21, miR-27a, miR-146a, miR-200a, and miR-196a) and three underexpressed (miR-217, miR-20a, and miR-96) in pancreatic cancer samples compared to benign pancreatic tissue. Expression of miR-21, miR-27a, miR-146a, miR-200a, and miR-196a was significantly increased in cancer fine-needle aspirates relative to matched controls in all samples. Expression of miR-217, miR-20a, and miR-96 was significantly downregulated in almost all pancreatic cancer tissues.
Conclusion:
We demonstrate the feasibility of performing miRNA profiling on very small specimens obtained using fine-needle aspiration of pancreatic cancers.
Insights
MicroRNA (miRNA) profiling of pancreatic cancer is feasible using fine-needle aspiration. This method identified 158 differentially expressed miRNAs, offering potential biomarkers for early detection and diagnosis.
Area of Science:
- Oncology
- Molecular Biology
- Biomarker Discovery
Background:
- MicroRNAs (miRNAs) are investigated as potential biomarkers for various cancers.
- Pancreatic cancer diagnosis often relies on invasive procedures, highlighting the need for minimally invasive biomarker detection methods.
Purpose of the Study:
- To establish the feasibility of miRNA expression profiling in small biopsy samples of pancreatic cancer.
- To assess miRNA profiles in freshly collected aspirates from pancreatic cancer surgical resections.
Main Methods:
- Fine-needle aspiration (20-23 gauge) was used to collect pancreatic cancer and adjacent normal tissue samples.
- miRNA expression profiling was performed using miRNA microarrays to identify differentially expressed miRNAs.
- Quantitative RT-PCR was employed to validate microarray findings for selected miRNAs.
Main Results:
- 158 aberrantly expressed miRNAs were identified in pancreatic cancers compared to normal tissue (51 overexpressed, 107 underexpressed).
- Quantitative RT-PCR confirmed significant differential expression for eight selected miRNAs, including upregulated miR-21, miR-27a, miR-146a, miR-200a, miR-196a and downregulated miR-217, miR-20a, miR-96.
- The study demonstrated consistent miRNA expression patterns in fine-needle aspirates relative to matched normal tissues.
Conclusions:
- MicroRNA profiling is feasible using very small specimens obtained via fine-needle aspiration of pancreatic cancers.
- This technique holds promise for developing minimally invasive diagnostic and prognostic tools for pancreatic cancer.
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