We followed previously published protocol for the extraction of RNA from FFPE tissues (11 (link)). Based on our previous experience, we used 4 × 10 μm-thick sections to extract total RNA from FFPE samples. For rapid purification, PureLink FFPE Total RNA Isolation Kit was used (Invitrogen, Thermo Fischer Scientific, Foster City, CA) according to the manufacturer's recommendations. The RNA data quality was assessed by 260/280 absorption signal ratio and the RIN number.
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