(A).MRNA level of Lin28 after Lin28 knockdown were detected by qRT-PCR at 48h,72h post-transfection in MKN45/Lin28 C2 and MKN28/Lin28 C3. Each data point represents the mean±SD of three independent experiments. (**p<0.01,*p<0.05).(B). Protein level of Lin28 in MKN45/Lin28 C2 and MKN28/Lin28 C3 were detected by western-blot 72h after Lin28-siRNA transfection. (C). Chemo-sensitivity of MKN45/Lin28 and MKN28/Lin28 to OXA, PTX and ADM by MTT assay after Lin28 expression were knockdown. (D) and (E).Apoptosis change among MKN45/Lin28/si-Lin28, MKN45/Lin28/si-control, MKN28/Lin28/si-Lin28, MKN28/Lin28/si-control at OXA 3.2ug/ml,PTX 1uM.After Lin28 was knock-down,the apoptosis of MKN45/Lin28 were decreased. Each data point represents the mean±SD of three independent experiments. (*p<0.05).