Trastuzumab is used to treat a certain type of breast cancer that makes more than usual amounts of a substance in your body (HER2 protein). Trastuzumab belongs to a class of medications known as monoclonal antibodies. It works by slowing or stopping the growth of cancer cells. This product... This monograph is about the following trastuzumab products: trastuzumab (subcutaneous) and trastuzumab-hyaluronidase-oysk. These products are not the same as other trastuzumab products, including trastuzumab emtansine, or trastuzumab given by injection into a vein, and should not be used in place of each other. View More Info

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