tras·tu·zu·mab 
(trăs-tzə-măb′)
(trăs-tzə-măb′)n.
A humanized monoclonal antibody used intravenously to treat certain types of breast cancer and gastric cancer.
[tras-, origin unknown + TU(MOR) + -zu- (shortening and alteration of humanized) + m(onoclonal) a(nti)b(ody).]