Cross NCP et al. - There is considerable molecular heterogeneity with 8 partner genes currently known for FGFR1, 6 for PDGFRA and 17 for PDGFRB. The vast majority of patients with PDGFRA or PDGFRB fusions achieve rapid and durable complete haematological and molecular responses to sustained imatinib therapy. A key ongoing challenge is to define the molecular pathogenesis of the great majority of atypical myeloproliferative disorders for whom the causative lesion remains unknown, since very few of these cases gain any benefit from imatinib or other second-generation inhibitors.
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