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Women taking estrogen after menopause are at slightly greater risk of getting breast cancer than women who don't, according to the largest study of the link between the disease and the hormone, researchers report.

The finding, published in the Journal of the American Medical Association, continues a decade-long debate over the connection between the hormone and breast cancer. Scientists said the statistical study was not the final word and that research would continue.

Researchers found that there were 2.6 breast cancer cases per 1,000 women who used estrogen after menopause, a risk 36 percent greater than the 1.9 cases per 1,000 non-users. The study followed 120,000 Massachusetts women for 10 years.

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