In those 9 patients, primary diagnoses included atypical chronic myeloid leukemia (PDGFRB, n = 1; FGFR1, n = 1), myelodysplastic/myeloproliferative neoplasm (PDGFRB, n = 1; FGFR1, n = 1), myeloproliferative neoplasm unclassified (PDGFRB, n = 2; JAK2n = 1), myelofibrosis (JAK2, n = 1) and mixed phenotype acute leukemia (FGFR1, n = 1). The gene discussed is PDGFRB; the disease is myelofibrosis.