Global Herceptin Market is valued at US$ 3.44 billion in 2025, and it is expected to grow US$ 5.87 billion by 2034 with the CAGR 6.1% from 2025 to 2034. Scope of Global Herceptin Market The Herceptin market refers to the global industry focused on trastuzumab, a monoclonal antibody therapy widely used to treat HER2-positive breast and gastric cancers, including both the original branded drug and its biosimilars developed by Roche.