Trastuzumab is used to treat:
- HER2 positive breast cancer
- HER2 positive cancers of the stomach or gullet (oesophagus).
It is best to read this information with our general information about the type of cancer you have.
Your doctor will talk to you about this treatment and its possible side effects before you agree (consent) to have treatment.
Trastuzumab is not the same as trastuzumab emtansine (Kadcyla®). We have separate information about trastuzumab emtansine (Kadcyla®).