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  • Title: Pathological response of salivary duct carcinoma to trastuzumab and docetaxel therapy.
    Author: Ueki Y, Tada Y, Togashi T, Kawakita D, Nagao T, Sato Y.
    Journal: Int Cancer Conf J; 2016 Jul; 5(3):150-153. PubMed ID: 31149444.
    Abstract:
    Salivary duct carcinoma (SDC) has a poor prognosis owing to the high incidence of distant metastasis. Approximately 40 % of SDCs are positive for human epidermal growth factor receptor 2 (HER2), suggesting that anti-HER2 therapy for cases with distant metastasis may be effective. However, the pathological response of SDC metastases to anti-HER2 therapy has not been reported. A 44-year-old man was diagnosed with HER2-positive SDC of the submandibular gland with multiple distant metastases. After six cycles of trastuzumab/docetaxel therapy, the patient achieved clinical partial response for the primary tumor and complete response for the neck and distant metastases. Subsequently, the patient underwent submandibular gland resection and neck dissection. On histopathological examination, very few viable cancer cells were identified in the resected primary tumor. Unfortunately, the patient died of multiple distant metastases 12 months after initial treatment. Trastuzumab/docetaxel therapy can elicit a clinical and pathological response in HER2-positive SDC.
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