Researchers are looking for a better way to treat people who have advanced non-small cell lung cancer (NSCLC) with specific genetic changes called human epidermal growth factor receptor 2 (HER2) mutations. Advanced NSCLC is a group of lung cancers that have spread to nearby tissues or to other parts of the body or that are unlikely to be cured or controlled with currently available treatments. HER2 is a protein that helps cells to grow and divide. A damage (also called mutation) to the building plans (genes) for this protein in cancer cells leads to a production of abnormal HER2 and therefore abnormal cell growth and division. The study treatment, sevabertinib, is expected to block the mutated HER2 protein which may stop the spread of NSCLC. The main purpose of this study is to learn how well sevabertinib works and how safe it is compared with standard treatment, in participants who have advanced NSCLC with specific genetic changes called HER2 mutations. The study participants will receive one of the study treatments: * Sevabertinib twice every day as a tablet by mouth, or * Standard treatment in cycles of 21 days via infusion ("drip") into the vein. * Participants will continue their assigned treatment for as long as they benefit from it and do not experience severe side effects, or until they or their doctor decide to stop treatment. When a participant receiving the standard treatment has their disease get worse (this is called "disease progression"), they may have the opportunity to switch ("cross over") to receive sevabertinib. * Participants who switch to sevabertinib will continue this treatment until their disease gets worse again, they have side effects that are too severe, or they or their doctor decide to stop treatment. During the study, the doctors and their study team will: * take imaging scans, including CT, PET, MRI, and X-rays, of different parts of the body to study the spread of cancer * check the overall health of the participants by performing tests such as blood and urine tests, and checking * heart health using an electrocardiogram (ECG) * perform pregnancy tests for women * ask the participants questions about how they are feeling and what adverse events they are having. An adverse event is any medical problem that a participant has during a study. Doctors keep track of all adverse events, irrespective if they think it is related or not to the study treatment.
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Progression free survival (PFS) per RECIST 1.1 as assessed by BICR
Timeframe: Up to approximately 2 years
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