progesterone receptor negative [also called PR-]


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(pro-JES-ter-own ree-SEP-ter NEG-uh-tiv)

Breast cancer cells without progesterone receptors. These receptors are special proteins that the hormone progesterone binds to. PR negative breast cancer cells do not depend on progesterone to grow.

Read more about hormone receptor status.

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Audio contributed by: Maxine Jones

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