Figure 5.ANRIL increases resistance of pancreatic cancer cells to gemcitabine chemotherapy. (A) MTT assay showed that overexpression of ANRIL resisted the inhibition of pancreatic cancer cells by gemcitabine, but miR-181a mimics reversed the effect which caused by ANRIL. OD value reflected the relative proliferative activity of each group. (B) Colony formation assays suggested the effects of miR-181a, ANRIL and gemcitabine on the proliferation of PANC-1 cells and BxPC-3 cells. *P < 0.05, **P < 0.01, ***P < 0.001.