This phase II trial tests whether ado-trastuzumab emtansine works to shrink tumors in patients with HER2-positive salivary gland cancer that has come back (recurrent), spread to other places in the body (metastatic), or cannot be removed by surgery (unresectable). Trastuzumab emtansine is a monoclonal antibody, called trastuzumab, linked to a chemotherapy drug called emtansine. Trastuzumab attaches to HER2 positive cancer cells in a targeted way and delivers emtansine to kill them. Trastuzumab emtansine may work better compared to usual treatment of chemotherapy with docetaxel and trastuzumab in treating patients with salivary gland cancer.
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