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miRNAs are stable in colorectal cancer archival tissue blocks

Liselle Bovell1, Chandrakumar Shanmugam, Venkat R Katkoori

  • 1Department of Pathology, University of Alabama at Birmingham, 515B1-Kracke, Building 619, 19th Street South, Birmingham, AL 35294-7331, USA.

Frontiers in Bioscience (Elite Edition)
|December 29, 2011
PubMed

Insights

MicroRNAs (miRNAs) are stable in long-term stored formalin-fixed paraffin-embedded colorectal cancer tissues. This stability allows for the use of these archived samples in biomarker discovery for colorectal cancer (CRC).

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • MicroRNAs (miRNAs) hold significant prognostic and therapeutic potential for colorectal cancer (CRC).
  • Formalin-fixed paraffin-embedded (FFPE) tissues are a valuable resource for biomarker studies.
  • The stability of miRNAs in FFPE tissues stored for over 20 years remains largely uncharacterized.

Purpose of the Study:

  • To assess the stability of specific microRNAs (miRNAs) in colorectal cancer (CRC) tissues archived for extended periods (6-28 years).
  • To determine if FFPE CRC tissues stored long-term are suitable for miRNA biomarker discovery.

Main Methods:

  • Analysis of 345 FFPE CRC tissues, stored between 1982 and 2004.
  • Quantification of six specific miRNAs (miR-20a, miR-21, miR-106a, miR-181b, miR-203, miR-324-5p) using TaqMan(r) microRNA assays and qRT-PCR.
  • Linear regression analysis to evaluate miRNA expression stability over time.

Main Results:

  • Consistent expression levels were observed for all six evaluated miRNAs across FFPE CRC tissues stored for 6 to 28 years.
  • Statistical analysis (linear regression) showed no significant degradation or alteration in miRNA levels over the long storage period (R2 < 0.009, p >= 0.05).

Conclusions:

  • MicroRNAs exhibit remarkable stability in FFPE tissues even after decades of storage.
  • Archived FFPE CRC tissues are a reliable source for miRNA biomarker discovery, enabling retrospective studies.

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