Dictionary of Cancer Terms
View in Spanish: RU 486
RU 486
A drug used to end early pregnancies. It is also being studied in the treatment of some types of cancer and other conditions. RU 486 blocks the action of progesterone, a hormone that helps some cancers grow. It is a type of antiprogesterone. Also called Mifeprex and mifepristone.
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.