For the detection of metastasis-associated lung adenocarcinoma transcript 1 (MALAT1), reverse transcriptase M-MLV was used to reverse transcribe serum RNA into cDNA (Takara, Japan) (RNaseH−) according to the manufacturer’s protocol.
An ABI ViiA™ 7 real-time PCR system (Applied Biosystems) and a TaKaRa SYBR PrimeScript™ miRNA RT-PCR kit (Takara, Japan) were used to perform quantitative PCR. The universal primers were provided by the manufacturer. The miRNA-specific forward primers are shown in
The quantitative PCR reactions were conducted as follows: at 95°C for 30 seconds; at 95°C for 5 seconds; and at 60°C for 31 seconds, for 40 cycles. The expression of miRNA of all of the samples was normalized to cel-miR-39 [9 (link)]. GAPDH was used as a reference gene for the gene expression normalization [10 (link)]. All the reactions were conducted in triplicate, and the 2−ΔΔCt method was used to calculate the relative expression levels of the target genes.