Definition

A combination of two drugs used alone or with other drugs to treat adults with certain types of HER2-positive breast cancer. Trastuzumab binds to a protein called HER2, which is found on some cancer cells. This may help the immune system kill cancer cells. Hyaluronidase allows trastuzumab to be given by injection under the skin. Trastuzumab and hyaluronidase can be given in less time than trastuzumab alone, which is given as an infusion. Also called Herceptin Hylecta.