D842V FIP1L1-PDGFRA FIP1L1-PDGFRA T674I V561D PDGFRA FUSIONS I843DEL TNKS2-PDGFRA DI842-843VM D842Y D842I V561A R841K G853D H845Y P577S AMPLIFICATION EXON 18 MUTATION D842_H845DELDIMH DIM842_844DEL W559_R560DELWR L579M