Effect of XIAP depletion on chemosensitivity of PC-3 cells. Cells were electroporated with 1 μM control siRNA (con siRNA) or 1 μM s1455 XIAP siRNA. All compounds were added 24 hr following electroporation and incubated for 72 hr. Untreated cells (black circle); Electroporated cells (black square); 1 μM control siRNA (black triangle) XIAP siRNA (inverted black triangle).