Expression of apoptosis-related proteins in human gastric carcinoma cells treated with CK. (A) BGC823 cells were treated with different concentrations of CK (0, 2.5, 5.0, 7.5 and 10.0 μmol/l) for 24 hrs. (B) SGC7901 cells were treated with different concentrations of CK (0, 2.5, 5.0, 7.5 and 10.0 μmol/l) for 24 hrs. The total protein was extracted and the expression of apoptosis-related proteins was analysed by Western blot assay. Data are reported as means ± S.D. of three separate experiments, * and ** indicate P < 0.05 and P < 0.01 compared with control group, respectively.