Effects of isoimperatorin on the expression levels of apoptotic protein. Protein expression levels of Survivin, Bcl-2, Bax, c-caspase-9 and c-caspase-3 were examined in the SGC-7901 cell-induced xenograft model. **P<0.01, compared with the control. Bcl-2, B cell lymphoma-2; Bcl-xl, B cell lymphoma-extra large; Smac, second mitochondria-derived activator of caspase; Bax, Bcl-2-associated X factor.