Effects of PEC concentration on the expression levels of XIAP, caspase-3/7 activation, and cleavage of PARP in AGS and MKN28 cells. AGS and MKN28 cells were treated with indicated concentrations of PEC for 24 h. The cell lysates were subjected to SDS-PAGE and analyzed by immune-blotting. Densitometry analyses of XIAP, Procaspase-8, Procaspase-7, Procaspase-3, cleaved caspase-7, cleaved caspase-3 and cleaved PARP proteins expressions are expressed as the mean ± standard deviation (SD) of at least three independent experiments. Statistical differences were analyzed with Student’s t-test (* p < 0.05 vs. control).