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[FIP1L1/PDGFRalpha fusion gene-negative chronic eosinophilic leukemia with t(5;12)(q31;p13): a case report and review of literatures].

AbstractOBJECTIVE:
To deepen the understanding of chronic eosinophilic leukemia (CEL).
METHODS:
The course of diagnosis and treatment in a case of FIP1L1/PDGFRalpha fusion gene negative CEL was reported. Flow cytometry was used to analyze the immunophenotype of the cells in peripheral blood and pleural fluid. Karyotype was analyzed with G-banding. The expression of FIP1L1/PDGFRalpha fusion gene was detected by RT-PCR technique. Routine pathological examination of the tissues from bone marrow, lung and spleen were performed.
RESULT:
A sixteen-year-old girl had severe anemia, fever, splenomegaly, thrombocytopenia and dominant hypereosinophilia lasting for 22 months. Trephine biopsy showed a hypercellular marrow with eosinophilic proliferation and moderate reticular fibrosis. Eosinophilic infiltration was found in lung and spleen and embolism was also found in spleen. She had a clonal chromosomal abnormality t(5;12)(q31;p13). The expression of FIP1L1/PDGFRalpha was negative. An abnormal clone of T cells expressing CD(3)(-), CD(4)(-), CD(8)(+) was found in peripheral blood and pleural fluid, in which the clonal T cell accounted for 5.43% and 1.66% of the total lymphocytes respectively. The patient was refractory to treatment with hydroxyurea, prednisone and interferon alpha. She had poor response to a combination of therapy with low dose cytosine arabinoside, mitoxantrone, vincristine, cyclophosphamide, methotrexate and prednisone. She did not respond to imatinib and died of multiple organ failure.
CONCLUSION:
The present case fulfilled the WHO diagnostic criteria of FIP1L1/PDGFRalpha(-) CEL which did not respond to routine treatment and imatinib. Allogenic stem cell transplantation should be considered as early as possible in this case. It is noteworthy that clonal CD(3)(-), CD(4)(-), CD(8)(+)T-cell abnormality is related to the pathogenesis of CEL.
AuthorsRong-mu Luo, Shu-lan Wu, Chun-rong Tong, Jing-ying Qiu, Ping Wu, Dao-pei Lu
JournalZhonghua nei ke za zhi (Zhonghua Nei Ke Za Zhi) Vol. 47 Issue 11 Pg. 919-22 (Nov 2008) ISSN: 0578-1426 [Print] China
PMID19080234 (Publication Type: Case Reports, English Abstract, Journal Article)
Chemical References
  • FIP1L1 protein, human
  • mRNA Cleavage and Polyadenylation Factors
  • Receptor, Platelet-Derived Growth Factor alpha
Topics
  • Adolescent
  • Female
  • Humans
  • Hypereosinophilic Syndrome (diagnosis, genetics)
  • Receptor, Platelet-Derived Growth Factor alpha (genetics)
  • T-Lymphocytes
  • mRNA Cleavage and Polyadenylation Factors (genetics)

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