This study investigates cancers with HER2 amplification or activating mutations.
The study evaluates the investigational medication's potential effectiveness and safety in treating different types of cancers with HER2 changes.
- Who can participate: Participants must be 12 years or older with a confirmed diagnosis of a cancer having HER2 amplification or mutation.
- Study details: Participants will receive an investigational medication and may also receive a placebo. An inactive substance that looks like the investigational medicine but does not contain any medicine.