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CHICAGO Aspirin may not be the answer to colon cancer prevention.A large study of women found that aspirin helps, but its effect is significant only after a decade of use. And unfortunately, there are side effects. The 20-year study of almost 83-thousand nurses published in tomorrow's Journal of the American Medical Association says high doses of aspirin reduced colon cancer risk by a third, but also were linked to dangerous bleeding. The researchers estimated a high-dose aspirin regimen that prevented one or two cases of colorectal cancer also would cause eight additional cases of serious bleeding from irritation of the stomach or intestines. Experts say the best prevention is regular screening, exercise and eating a high-fiber, lowfat diet. Copyright 2005 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.