The plasma (200 µl) and tumor tissue (5 mg) samples
were subjected to miRNA extraction. Frozen plasma
samples were thawed and miRNAs were extracted
using a miRNA extraction kit (Qiagen, Valencia, CA,
USA) according to the manufacturer’s instructions.
Tissue miRNAs (tumor and the corresponding
normal tissues) were isolated by a modified TRIzol
protocol as explained previously (14 (link)). The quantity
and quality of the extracted RNA was evaluated
using spectrophotometry and gel electrophoresis,
respectively.
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