NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,573 terms related to cancer and medicine.
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- PR negative
- listen (... NEH-guh-tiv)
- Describes cells that do not have a protein to which the hormone progesterone will bind. Cancer cells that are PR negative 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.