Reverse transcription-quantitative polymerase chain reaction analysis of miR-136 expression in gastric cancer tissues and cell lines. (A) miR-136 expression was determined in 26 paired gastric cancer tissues and matched adjacent non-tumorous gastric mucosae tissues. The data were presented as box plots. The top of the box indicates upper quartile, and the bottom of the box indicates lower quartile. The central line in the box indicates median, and the whiskers indicate the range. *P<0.05 vs. non-tumor tissues (B) Relative expression of miR-136 in four gastric cancer cell lines (AGS, BGC-823, MGC-803 and SGC-7901) and normal human gastric epithelial GES-1 cells. Data are presented as the mean ± standard deviation. *P<0.05 vs. GES-1. miR, microRNA.