drug resistance

Definition / meaning of drug resistance

The failure of cancer cells, viruses, or bacteria to respond to a drug used to kill or weaken them. The cells, viruses, or bacteria may be resistant to the drug at the beginning of treatment, or may become resistant after being exposed to the drug.

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Find More About 'drug resistance'

Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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