In a recent tip on RealAge.com there's information about Capsaicin, the stuff in chili peppers that gives them heat. Here's what RealAge.com has to say:
Capsaicin, the compound in chili peppers that gives them their heat, may help protect against liver cancer, according to a recent study in which capsaicin helped kill cancerous liver cells. Use hot salsa made with chili peppers to flavor your favorite foods, such as omelets, mixed vegetable dishes, and burritos.
It's the white flesh around the seeds where the heat resides. Read more about capsaicin here.