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Comparing RNA extraction protocols from formalin-fixed paraffin-embedded microcore samples.

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  • 1Excilone, Elancourt, France.

Plos One
|December 8, 2025
PubMed
Summary
This summary is machine-generated.

Analyzing intratumoral heterogeneity is crucial, but current methods are costly. A new microcore technique using formalin-fixed paraffin-embedded (FFPE) samples shows promise for sensitive molecular applications, even with small sample sizes.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Cancer Research

Background:

  • Intratumoral heterogeneity analysis is vital for diagnostics and research.
  • Existing dissection techniques for tissue heterogeneity are often financially inaccessible and impractical for routine use.
  • Formalin-fixed paraffin-embedded (FFPE) samples offer a valuable resource but pose challenges for transcriptomic studies due to small sample size and processing.

Purpose of the Study:

  • To evaluate the efficacy of five commercial RNA extraction kits for analyzing microcores from human and mouse FFPE tissues.
  • To assess RNA yield, RNA fragmentation, and RT-qPCR efficiency using FFPE microcores.
  • To compare deparaffinization and non-deparaffinization protocols for RNA extraction from FFPE microcores.

Main Methods:

  • Collected 30 microcore samples from human (uterus, stomach) and murine (liver, spleen) FFPE tissues.
  • Utilized a novel microcore-based dissection technique with 200 µm needles.
  • Analyzed RNA yield, fragmentation, and RT-qPCR efficiency across five commercial RNA extraction kits, comparing deparaffinization methods.

Main Results:

  • Significant variations in RNA yield and fragmentation were observed among different kits and FFPE tissue types.
  • Differences in quantitative PCR (qPCR) efficiency were noted, highlighting a limitation of the small initial sample size.
  • No significant differences in outcomes were found between deparaffinized and non-deparaffinized microcore samples.

Conclusions:

  • Demonstrated the feasibility of using FFPE microcore samples for sensitive molecular biology applications.
  • Highlighted the importance of optimizing workflows, as different protocols yielded significantly different results.
  • Validated the use of FFPE microcores for studying tissue heterogeneity, with or without deparaffinization.