Researchers report the development of a new group of aspirin-like substances that may be safer and as effective as conventional aspirin for fighting heart disease, the leading cause of death in the developed world.

Physicians have known for years that daily low-doses of aspirin, or acetylsalicylic acid, reduce the risk of developing heart attacks and stroke in some people.

However, prolonged use of aspirin can damage the stomach lining, causing bleeding and ulcers that can be life-threatening.

A safer form...