Perjeta (generic: pertuzumab) is a prescription medication used with other medications to treat a certain type of breast cancer that has spread to other areas of the body. Perjeta is also approved for use as a complete treatment regimen for patients with early stage breast cancer before surgery.

Perjeta is specifically designed to treat people with HER2-positive breast cancer. Perjeta belongs to a class of medications called monoclonal antibodies. It works by inhibiting the growth and spread of cancer cells.