%0 Journal Article %A KAI P. HOEFIG %A CHRISTOPH THORNS %A ANJA ROEHLE %A CHRISTIAN KAEHLER %A KAI O. WESCHE %A DIRK REPSILBER %A BIGGI BRANKE %A MARLEN THIERE %A ALFRED C. FELLER %A HARTMUT MERZ %T Unlocking Pathology Archives for MicroRNA-profiling %D 2008 %J Anticancer Research %P 119-123 %V 28 %N 1A %X Background: MicroRNAs (miRNAs) are ~22 nucleotide long, non-coding RNAs that regulate gene expression by binding to the 3′-untranslated region of target mRNAs and also a variety of cellular processes. It has recently been established that dysregulation of miRNA expression can be detected in the majority of human cancers. A variety of high-throughput screening methods has been developed to identify dysregulated miRNA species in tumours. For retrospective clinical studies formalin-fixed, paraffin-embedded (FFPE) tissue is the most widely used material. Materials and Methods: The miRNA expression profiles of freshly frozen (CRYO) and FFPE tissues of seven tonsil and four liver samples were compared, using a qPCR-based assay, profiling 157 miRNA species. Results: The significance of miRNA-profiles was barely influenced by FFPE treatment in both tissues and the variance induced by FFPE treatment was much smaller than the variance caused by biologically based differential expression. Conclusion: FFPE material is well suited for miRNA profiling. %U https://ar.iiarjournals.org/content/anticanres/28/1A/119.full.pdf