Ripretinib (QINLOCK®) According to Current SmPC

The goal of this prospective, observational study INTEREST is to collect real-world data on ripretinib treatment in a broad patient population in Germany. Ripretinib will be administered according to the current SmPC. Thus, INTEREST will evaluate for the first time ripretinib in GIST patients in a real-world setting in Germany. The main questions the study aims to answer are: * Evaluate quality of live (QoL) using the questionnaire EQ-5D-5L to gain knowledge about how ripretinib treatment affects GIST patients' well-being (change compared to Baseline, Time to Deterioration) * Assessment of effectiveness in routine treatment (Progression-Free Survival, Overall Survival, Best Response, Overall Response Rate, Disease Control Rate * Assessment of drug safety * Assessment of parameters of physicians\' treatment decision making * Description of treatment reality in detail