PERTUZUMAB; TRASTUZUMAB; HYALURONIDASE (per TOOZ ue mab; tras TOO zoo mab; hye al ur ON i dase) treats breast cancer. Pertuzumab and trastuzumab work by blocking a protein that causes cancer cells to grow and multiply. This helps to slow or stop the spread of cancer cells. Hyaluronidase helps your body absorb this medication. This helps it work better in your body. It is a combination medication that contains two monoclonal antibodies.

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