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Related Experiment Videos

Expression profiling with RNA from formalin-fixed, paraffin-embedded material.

Andrea Oberli1, Vlad Popovici, Mauro Delorenzi

  • 1Department of Clinical Research, University of Bern, Murtenstrasse 35 CH-3010 Bern, Switzerland. andrea.oberli@dkf.unibe.ch

BMC Medical Genomics
|April 22, 2008
PubMed
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This study presents a simple method for isolating RNA from formalin-fixed, paraffin-embedded (FFPE) cancer samples. This RNA enables reliable gene expression profiling, crucial for cancer subtyping and treatment decisions.

Area of Science:

  • Molecular biology
  • Cancer research
  • Genomics

Background:

  • Gene expression profiling aids cancer classification and subtype discovery.
  • Fresh-frozen (FF) tumor material is limited, unlike abundant formalin-fixed, paraffin-embedded (FFPE) samples.
  • RNA from FFPE is fragmented and chemically modified, challenging standard expression analysis.

Purpose of the Study:

  • To develop a robust RNA isolation method for FFPE samples.
  • To enable gene expression profiling using FFPE-derived RNA.
  • To validate the suitability of FFPE RNA for quantitative reverse transcriptase PCR (QPCR).

Main Methods:

  • A simplified RNA isolation procedure for FFPE diagnostic samples.
  • Optimized cDNA synthesis protocol.

Related Experiment Videos

  • TaqMan assays targeting short amplicons for QPCR.

    • Main Results:

    • Successfully isolated RNA from FFPE material suitable for QPCR.
    • Achieved high correlation coefficients (0.83–0.97) between FFPE-derived and intact RNA.
    • Developed preliminary gene expression scores for ER response, HER2 signaling, and proliferation.

    Conclusions:

    • A simple, robust method for FFPE RNA isolation was established.
    • FFPE-derived RNA is suitable for gene expression profiling.
    • Combined gene expression measurements yield robust tumor status scores (hormonal, proliferation).