RecruitingPhase 2Drug trialPH 2 Pemigatinib in SDH-deficient GISTThe purpose of this study is to determine how effective the drug pemigatinib is as a treatment option for advanced succinate dehydrogenase (SDH)-deficient gastrointestinal stromal tumors(GIST). This study will also assess the side effects associated with pemigatinib and evaluate its tolerability. The name of the study drug involved in this study is: • Pemigatinib (INCB054828)