[Pediatric myeloid neoplasms associated with eosinophilia and platelet-derived growth factor receptor beta gene rearrangement: a case report and literature review].

Objective: To investigate the clinical features and therapeutic strategies of childhood myeloid neoplasms associated with eosinophilia and platelet-derived growth factor receptor beta (PDGFRB) gene rearrangement. Methods: Clinical data of myeloid neoplasms associated with eosinophilia and t (1;5) (q21;q33) chromosomal translocation of PDGFRB gene rearrangement in a child hospitalized in Institute of Hematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences on May 2015 was collected and analyzed. Using'eosinophilia child'and'PDGFRB'as keywords, the relevant reports in literature were searched from China National Knowledge Infrastructure (CNKI), Wanfang Data Knowledge Service Platform, and Biomedical Literature Database (PubMed) until April 2017. Results: The patient was a boy, 19 months old, who began to get sick at six months after birth, with the main clinical manifestations of high fever, diarrhea, epistaxis and hepatosplenomegaly. Peripheral blood smear showed a significant elevation in white blood cells (127×10(9)/L) and eosinophils(20.32×10(9)/L). Bone marrow examination showed hyperplastic marrow, increased proportion of granulocytes, apparent visible eosinophils and decreased megakaryocytes. Chromosome karyotype detection revealed t (1; 5) (q21; q33) translocation. Fluorescence in situ hybridization (FISH) examination uncovered that PDGFRB gene rearrangement was positive. The final diagnosis was myeloid neoplasms with eosinophilia and PDGFRB gene rearrangement. After treatment with oral imatinib 100 mg, once a day for 2 months, complete hematologic remission, complete cytogenetic and molecular remission were all achieved. The relevant literature was reviewed, no Chinese cases had been reported, 6 reports in English literature have complete clinical data. Four cases had t (1; 5) translocation. Four pediatric patients treated with imatinib achieved complete remission. Conclusion: Myeloid neoplasms associated with eosinophilia and PDGFRB gene rearrangement is extremely rare in children. Imatinib treatment can make these patients quickly achieve complete hematologic remission, complete cytogenetic and molecular remission. Imatinib should be recommended as the first line treatment of these patients.