Increased level of Bcl-2 and decreased expression of procaspase-9 (reciprocally proportional to the active form of caspase-9) argues for the mitochondrial apoptotic pathway and is in agreement with results of other investigators showing correlation of caspase-9 activation and cancer cell death following incubation with sulindac or sulindac sulfide (16) or PDTC (26). Here, CASP9 is linked to cancer.