trastuzumab
noun
tras·tu·zu·mab
| \ ˌtras-ˈtü-zü-ˌmab
\
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Medical Definition of trastuzumab
: a genetically engineered monoclonal antibody that is administered by injection to slow or inhibit tumor growth in some advanced breast cancers by blocking a cell membrane receptor which receives signals promoting cancer cell growth — see herceptin