Reduced levels of miR-206 expression in gastric cancer tissues and cell lines. (A) Distribution of miR-206 expression in a cohort of 35 human GC and noncancerous tissues by qRT-PCR. The endogenous U6 RNA was used as the internal control. (B) Pairwise comparison of miR-206 expression between GC and matching non-cancerous tissues showing miR-206 expression was reduced in 86% (30/35) of the sample pairs. (C) Relative expression of miR-206 in four GC cell lines and a normal gastric cell line (GES-1).