Will an Aspirin a Day Keep Cancer Away?

The first hint in the late 1970s that aspirin blocks intestinal tumors helped spur a wave of research in animals and clinical trials that established that aspirin and other nonsteroidal anti-inflammatory drugs protect against colon cancer. And now, decades later, aspirin is generating new excitement among cancer researchers. A series of studies from the United Kingdom in the last 2 years has offered the first evidence from placebo-controlled clinical trials that regularly taking low doses of aspirin wards off other types of cancer as well.