"It's inconsistent with the totality of evidence that finds estrogen increases breast cancer risk," said Valerie Beral, director of the cancer epidemiology unit at Oxford University.
Estrogen lowers breast cancer risk in some women →
"If you want to take hormone replacement therapy, estrogen-only has a much lesser effect on breast cancer than with progestin," she said. "But to say it protects against breast cancer is wrong."
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