In an analysis of four large studies, people who took a daily low-dose aspirin cut their risk of dying of colon cancer by as much as 35 percent.
And that's not the only common drug that might offer this bonus. Some pleriminary trails suggested that the diabetes drug metformin may protect against lung and colon cancers. Both drugs inflammation, which has been linked to cancer growth.
It's too coon to start taking either of these pills in hopes of preventing cancer, since both can have serious side effects. But if you're already taking them for other reasons, you may be doing your health favor.