Abstract
Background: The combination of Pertuzumab (PER) + Trastuzumab (HER) + Docetaxel (DTX) triple combination was established as the primary treatment of HER2 positive advanced and recurrent breast cancer. High tumor shrinkage effect was observed. So, to prevent side effects such as neurotoxicity by DTX, there are cases of transition to PER + HER maintenance therapy. Relapse was observed during PER + HER maintenance therapy, and DTX re-administration was performed in 4 cases, so we report it.
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