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This product contains 3 ingredients: pertuzumab, trastuzumab, and hyaluronidase. It is used to treat breast cancer. Pertuzumab and trastuzumab belong to a class of medications known as monoclonal antibodies. These medications work by slowing or stopping the growth of cancer cells. This product also contains hyaluronidase, which helps your body absorb pertuzumab and trastuzumab given by injection under the skin.