Tucatinib is a prescription medicine used with the medicines trastuzumab and capecitabine to treat adults with:
human epidermal growth factor receptor-2 (HER2) positive breast cancer that has spread to other parts of the body such as the brain (metastatic), or that cannot be removed by surgery, and
who have received one or more anti-HER2 breast cancer treatments.
It is not known if tucatinib is safe and effective in children.
