We report the case of a woman with HER2-positive metastatic breast cancer who achieved prolonged complete remission of multiple liver metastases after treatment with weekly trastuzumab plus paclitaxel but relapsed in the brain soon after stopping trastuzumab maintenance therapy which had been prosecuted for almost three years. In the absence of randomized trials, the optimal duration of trastuzumab administration after achieving complete remission of metastatic breast cancer remains questionable.
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