![](https://webarchive.library.unt.edu/eot2008/20081104113230im_/http://www.cancer.gov/images/spacer.gif) |
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![](https://webarchive.library.unt.edu/eot2008/20081104113230im_/http://www.cancer.gov/images/spacer.gif)
| 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 mifepristone and Mifeprex. |
Previous Definitions: | RPI.4610, RPR 109881A, RSR13, RSV, RTA 744 | Next Definitions: | Rubex, rV-TRICOM, S-1, S-phase fraction, S100 calcium binding protein A8 |
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