The National Cancer Institute has posted a statement on its Web site saying top experts do not believe abortion raises a woman's risk of breast cancer.
The institute had a similar statement on its Web site until last year, when it replaced it with one saying that study data were "inconsistent."
Abortion rights groups said the change was intended to please the Bush administration's allies in the antiabortion movement.
The cancer institute said it convened more than 100 of the world's top experts in February to review a broad range of data. With its new statement, the institute essentially reinstated its original opinion.
"I think we can be very pleased with this result," said Amy Allina of the National Women's Health Network, a feminist group.
-- Aaron Zitner