440mg Trastuzumab For Injection is a medication used in the treatment of certain types of breast cancer and stomach cancer. Trastuzumab is a monoclonal antibody that targets a specific protein known as human epidermal growth factor receptor 2 (HER2). Trastuzumab has been shown to improve outcomes and prolong survival in patients with HER2-positive breast and stomach cancers. It is often used in combination with other chemotherapy drugs or targeted therapies to maximize its effectiveness. 440mg Trastuzumab For Injection works by binding to HER2 receptors on cancer cells, inhibiting their growth and promoting their destruction by the immune system.