Fig. 5. Clinical data with BLU-285 confirm early evidence of activity in patients with diseases driven by KIT and PDGFRA activation loop mutations. Clinical.

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Fig. 5. Clinical data with BLU-285 confirm early evidence of activity in patients with diseases driven by KIT and PDGFRA activation loop mutations. Clinical data with BLU-285 confirm early evidence of activity in patients with diseases driven by KIT and PDGFRA activation loop mutations. (A) BLU-285 [30 mg per os (PO), QD] induces rapid radiographic clinical response per RECIST1.1 (31% tumor reduction at week 8) and decline in PDGFRA D842V ctDNA in a patient with PDGFRA D842V–mutant GIST that progressed on previous imatinib, dasatinib, and crenolanib therapy. The images show CT scans with tumor circled in yellow. The graph shows tumor burden as measured by the sum of the longest dimension for the target lesions (per RECIST1.1) and mutant allele frequency (MAF). (B) Radiographic clinical response per RECIST1.1 with BLU-285 (60 mg PO, QD) in a patient with primary KIT D820Y–mutant GIST that had previously progressed on imatinib, sunitinib, and regorafenib. The images show CT scans with a pelvic tumor mass highlighted within yellow circles that demonstrated a 28% tumor reduction at day 1 of cycle 5. A partial response of 32% tumor reduction was confirmed by central radiographic review at cycle 15. (C) BLU-285 (30 mg PO, QD) markedly decreased bone marrow mast cell burden in a patient with KIT D816V–driven aggressive SM. At baseline, diffuse bone marrow infiltration with malignant mast cells obliterated normal hematopoiesis (left). After BLU-285 treatment, there was a marked reduction in malignant mast cells and return of normal trilineage hematopoiesis (right). Scale bars, 1000 μm (left) and 200 μm (right). Erica K. Evans et al., Sci Transl Med 2017;9:eaao1690 Published by AAAS