progesterone receptor negative [also called PR-]

Page last modified on: June 11, 2008
(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.

Audio contributed by: Maxine Jones

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