There's ample evidence cholesterol-lowering pills called statins can reduce the risk of a repeat heart attack. The pills are frequently prescribed for people who've never had a heart attack or stroke, but are at high risk for trouble.
Scientists reported new evidence Wednesday that supports a provocative theory about cancer.
Three separate teams of scientists said they had, for the first time, shown that so-called cancer stem cells can be found naturally in brain tumors and early forms of skin and colon cancer.
Evidence has been mounting in recent years for the existence of these cells, which would be especially insidious. They are believed to resist standard chemotherapy and radiation and fuel the growth of tumors and relapses.