Can RNA purified from formalin-fixed, paraffin-embedded (FFPE) tissue be used with the QuantiTect Whole Transcriptome Kit?
FAQ ID -1583

Suitability of RNA templates for use with the QuantiTect Whole Transcriptome Kit depends on RNA quality and needs to be tested for each sample individually.

Ideally, RNA transcripts should be longer than 500 nucleotides. Although most FFPE samples provide enough RNA, the RNA is of insufficient quality.