Expression of miR-30a-5p in gastric cancer tissues and cell lines. (A) RT-qPCR was performed to measured the expression of miR-30a-5p in gastric cancer tissues (n=43) and normal gastric tissues (n=10). **P<0.01 vs. normal. (B) RT-qPCR was performed to measure the expression of miR-30a-5p in T1 stage (n=11) and T2-T4 stage (n=32) gastric cancer. ##P<0.01 vs. T1. (C) RT-qPCR was performed to measure the relative expression of miR-30a-5p in the human gastric cancer cell lines AGS, HGC27, BGC823 and SGC7901, and the normal gastric mucosa epithelial cell line GES-1, as a control. Data are presented as mean ± standard deviation of at least three independent experiments **P<0.01 vs. normal, ##P<0.01 vs. T1 and &&P<0.01 vs. GES-1. miR, microRNA; RT-qPCR, reverse transcription-quantitative polymerase chain reaction.