title: Maintenance therapy with imatinib appears necessary despite molecular remission in FIP1L1-PDGFRA fusion gene positive hypereosinophilic disorder.
abstract: Patients with primary hypereosinophilic disorders who are positive for the FIP1L1-PDGFRA fusion gene mutation are highly responsive to therapy with imatinib mesylate. A 35-year-old man with FIP1L1-PDGFRA positive hypereosinophilic syndrome and cardiac involvement, was treated with imatinib 100 mg daily. Hematologic and molecular remission and reversal of end-organ damage was achieved. He was then lost to follow up for 19 months. Imatinib successfully reinduced hematologic and molecular remission but worsening cardiac involvement was not reversed. Our experience and a review of limited literature suggest that imatinib maintenance therapy is necessary despite molecular remission of the FIP1L1-PDGFRA mutation.
authors.affiliation: Department of Haematology, Singapore General Hospital, Outram Road, Singapore 169608, Singapore. ng.heng.joo@sgh.com.sg
authors.forename: Heng Joo
authors.initials: HJ
authors.lastname: Ng
authors.forename: Daryl C L
authors.initials: DC
authors.lastname: Tan
authors.forename: Richard C
authors.initials: RC
authors.lastname: Yiu
authors.forename: Gee Fung
authors.initials: GF
authors.lastname: How
mesh_terms: D000328:Adult; D001549:Benzamides; D006801:Humans; D017681:Hypereosinophilic Syndrome / Q000188:drug therapy* / Q000235:genetics*; D000068877:Imatinib Mesylate; D008297:Male; D009154:Mutation; D015514:Oncogene Proteins, Fusion / Q000235:genetics*; D010879:Piperazines; D011743:Pyrimidines; D020796:Receptor, Platelet-Derived Growth Factor alpha / Q000235:genetics*; D012074:Remission Induction; D039221:mRNA Cleavage and Polyadenylation Factors / Q000235:genetics*
chemical_list: D001549:Benzamides; D015514:Oncogene Proteins, Fusion; D010879:Piperazines; D011743:Pyrimidines; D039221:mRNA Cleavage and Polyadenylation Factors; D000068877:Imatinib Mesylate; C479819:FIP1L1-PDGFRA fusion protein, human; D020796:Receptor, Platelet-Derived Growth Factor alpha