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NCI Dictionary of Cancer Terms

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NCI Dictionary of Cancer Terms



mifepristone  listen  (MIH-feh-PRIS-tone)

  A drug used to end early pregnancies. It is also being studied in the treatment of some types of cancer and other conditions. Mifepristone blocks the action of progesterone, a hormone that helps some cancers grow. It is a type of antiprogesterone. Also called Mifeprex and RU 486.