Any participant with histologically or cytologically confirmed advanced/unresectable or metastatic GIST with documented KIT or platelet-derived growth factor receptor alpha (PDGFRA) mutation, who has progressed on or was intolerant to at least 1 approved tyrosine kinase inhibitor (TKI) regimen in the advanced/metastatic setting
Have at least 1 measurable lesion as defined by mRECIST, v1.1
Have Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) of 0 or 1
Adequate organ function, bone marrow function, and electrolytes
All participants agree to comply with the contraception requirements
Have a life expectancy of more than 3 months
You may not be if
Received systemic anticancer therapy or radiotherapy within 14 days prior to first dose of study drug
Prior or concurrent malignancy that requires treatment or is expected to require treatment for active cancer
Has known active central nervous system (CNS) metastases or an active primary CNS cancer
History or presence of clinically relevant cardiovascular abnormalities
Major surgery within 28 days of the first dose of study drug
Had systemic arterial thrombotic or embolic events within 6 months prior to the first dose of study drug
Had venous thrombotic events (e.g., deep vein thrombosis) or venous thrombotic embolic events (e.g., pulmonary embolism) within 1 month prior to the first dose of study drug
Known allergy or hypersensitivity to any component of the study drug
Malabsorption syndrome or other illness that could affect oral absorption
