To the Editor: Slamon et al. (March 15 issue)1 show that theaddition of trastuzumab, a monoclonal antibody against the humanepidermal growth factor receptor HER2 (also known as HER2/neu),to chemotherapy in women with metastatic breast cancer thatoverexpresses HER2 is associated with significantly better responsesand longer survival than chemotherapy alone. However, cardiotoxicityis the most serious complication of trastuzumab, especiallywhen it is administered in combination with anthracyclines.1,2,3
We hypothesized that cardiotoxicity and antitumor efficacy maybe related to specific uptake of trastuzumab in the myocardiumand tumor, respectively. Twenty patients with metastatic breastcancer that expressed . . . [Full Text of this Article]
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