BBC News reports on research that indicates the component in peppers that makes them spicy, capsaicin, may kill cancer cells. At least in petri dishes.
Apparently capsaicin attacks the mitochondria in cancer cells but doesn't affect normal cells (the main function of mitochondria is to produce energy for cells). Researchers tested it in cultures of lung cancer and pancreatic cancer cells.
While the research doesn't indicate that eating spicy food will cure or prevent cancer, it couldn't hurt. Relatively speaking.
That reminds me. It's time to plant my Ghost Pepper and Trinidad Moruga Scorpion seeds. [Link]