Endogenous reference RNAs for microRNA quantitation in formalin-fixed, paraffin-embedded lymph node tissue.

Area of Science:

• Oncology
• Molecular Biology
• Biotechnology

Background:

• Lymph node metastasis is a key factor in cancer spread.
• MicroRNA (miRNA) expression analysis in formalin-fixed, paraffin-embedded (FFPE) lymph nodes aids cancer metastasis research.
• A lack of universal endogenous reference genes hinders accurate miRNA quantification in FFPE lymph nodes.

Purpose of the Study:

• To identify and validate stable endogenous reference genes for miRNA expression analysis in FFPE lymph nodes.
• To establish reliable normalization strategies for miRNA studies in cancer metastasis.
• To provide a foundation for accurate miRNA expression profiling in FFPE lymph node tissues.

Main Methods:

• Selected 10 miRNA candidates for endogenous reference genes using the global mean method.
• Assessed miRNA stability using BestKeeper, geNorm, NormFinder, and comparative ΔCt statistical tools.
• Evaluated the stability of individual and combined reference genes for normalization.

Main Results:

• miR-103a was identified as the most stable single candidate gene.
• The use of a single reference gene was not recommended due to insufficient stability.
• A combination of miR-24, miR-103a, and let-7a emerged as the most stable set for normalization.

Conclusions:

• The combined set of miR-24, miR-103a, and let-7a is recommended for normalizing miRNA expression in FFPE lymph nodes.
• This finding supports accurate miRNA expression analysis in FFPE lymph node tissues for cancer research.
• The study provides a validated reference gene set for future miRNA expression studies in FFPE lymph nodes.