Fig. 7From: Sustained delivery of siRNA/PEI complex from in situ forming hydrogels potently inhibits the proliferation of gastric cancerImmunostaining of cyclin D1 and P21 in tumor cells. cyclin D1 expression was downregulated in the siRNA/collagen treated tumor cells, while P21 expression was significantly increased, indicating that the cell cycle was inhibited. The inhibitory effect from the siRNA/PEI/collagen group was more evident. (scale bars, 100 μm)Back to article page