P1023: AVAPRITINIB IN PATIENTS WITH ADVANCED SYSTEMIC MASTOCYTOSIS (ADVSM): EFFICACY AND SAFETY ANALYSES FROM THE PHASE 2 PATHFINDER STUDY WITH 2-YEAR FOLLOW-UP by Jason Gotlib, Andreas Reiter, Deepti Radia, Michael Deininger, Tracy George, Jens Panse, Alessandro Vannucchi, Uwe Platzbecker, Ivan Alvarez-Twose, Andrzej Mital, Olivier Hermine, Ingunn Dybedal, Elizabeth O. Hexner, Lambert Span, Ruben Mesa, Prithviraj Bose, Kirsten Pettit, Stephen Oh, Hui-Min Lin, Sasa Dimitrijevic, Javier Muñoz-González, Daniel J. Deangelo

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