Hormone replacement therapies help breast cancer grow and spread

(University of Missouri-Columbia) Research has indicated that women who take hormone replacement therapies have a higher incidence of breast cancer. Now, researchers at the University of Missouri have linked natural and synthetic progestins to the body's production of specialized cancer cells that act like stem cells in humans. Findings could help scientists target these rare cells that proliferate in breast cancers and metastasize elsewhere, and may help clinicians identify immunotherapies to c...