![](https://webarchive.library.unt.edu/web/20090514035259im_/http://www.cancer.gov/images/spacer.gif) |
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| Describes cells that do not have a protein to which the hormone progesterone will bind. Cancer cells that are PR- do not need progesterone to grow, and usually do not stop growing when treated with hormones that block progesterone from binding. Also called progesterone receptor negative. |
Previous Definitions: | potentiation, power of attorney, pPNET, PR, PR+ | Next Definitions: | PR-104, practitioner, Pravachol, pravastatin, pravastatin sodium |
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