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Nonsteroidal anti-inflammatory drugs (NSAIDs) such as sulindac effectively prevent colon cancer in humans and rodent models. However, their cellular targets and underlying mechanisms have remained elusive. We found that dietary sulindac induced apoptosis to remove the intestinal stem cells with nuclear or phosphorylated β-catenin in APC(Min/+) mice. NSAIDs also induced apoptosis in human colonic polyps and effectively removed cells with aberrant Wnt signaling. Furthermore, deficiency in SMAC, a mitochondrial apoptogenic protein, attenuated the tumor-suppressive effect of sulindac in APC(Min/+) mice by blocking apoptosis and removal of stem cells with nuclear or phosphorylated β-catenin. These results suggest that effective chemoprevention of colon cancer by NSAIDs lies in the elimination of stem cells that are inappropriately activated by oncogenic events through induction of apoptosis.

Chemoprevention by nonsteroidal anti-inflammatory drugs eliminates oncogenic intestinal stem cells via SMAC-dependent apoptosis