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Home >Information for Patients > Dictionary Index
Dictionary of Cancer Terms
View in Spanish: Antagonista
Antagonist (an-TA-guh-nist)
In medicine, a substance that stops the action or effect of another substance. For example, a drug that blocks the stimulating effect of estrogen on a tumor cell is called an estrogen receptor antagonist.
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.
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