Hypereosinophilia in a patient with invasive thymoma with clonal T-lymphocyte expansion expressing CD4, CD8, and CD25 antigens.

Abstract

We report the case of a patient with hypereosinophilia and invasive thymoma harboring probable clonal proliferation of CD4+, CD8+, and CD25+ T-lymphocytes. A 64-year-old woman had eosinophilia (14.1 x 10(9)/L) and an anterior mediastinal tumor with elevated levels of serum immunoglobulin E (609.8 mg/dL) and interleukin 5 (239 pg/mL). Bone marrow aspirate showed marked infiltration by morphologically normal eosinophils with a normal karyotype but no FIP1L1-PDGFRA fusion gene. Flow cytometric analysis revealed an increasing number of CD3+/CD25+ lymphocytes in the peripheral blood, and the resected thymoma had infiltrated lymphocytes with CD4/CD8/CD25 antigens. Moreover, the thymoma had T-cell receptor rearrangements with a cytogenetically clonal nature, ie, t(2;4)(p22;q26). Although the number of patients with thymoma showing hypereosinophilia is small, this case suggests that a subset of patients with thymoma may have clonal expansion of T-lymphocytes with abnormal phenotypes that affect clinical manifestations, including hypereosinophilia.

• Authors: Masahiko Sumi, Kosuke Nunoda, Tomonori Mizutani, Yuko Ishii, Akihiko Gotoh, Yukihiko Kimura, Yasuhiro Suga, Tatsuo Ohira, Kuniharu Miyajima, Hiromi Serizawa, Kiyoshi Mukai, Harubumi Kato, Kazuma Ohyashiki
• Journal: International journal of hematology (Int J Hematol) Vol. 83 Issue 3 Pg. 243-6 (Apr 2006) ISSN: 0925-5710 [Print] Japan
• PMID: 16720555 (Publication Type: Case Reports, Journal Article)

Chemical References

• Antigens, CD
• Oncogene Proteins, Fusion
• mRNA Cleavage and Polyadenylation Factors
• FIP1L1-PDGFRA fusion protein, human
• Receptor, Platelet-Derived Growth Factor alpha

Topics

• Antigens, CD (biosynthesis)
• Cell Proliferation
• Eosinophilia (blood, complications, genetics, pathology)
• Female
• Gene Expression Regulation, Neoplastic
• Humans
• Middle Aged
• Oncogene Proteins, Fusion
• Receptor, Platelet-Derived Growth Factor alpha
• T-Lymphocytes (metabolism, pathology)
• Thymoma (blood, complications, genetics, pathology)
• Thymus Neoplasms (blood, complications, genetics, pathology)
• mRNA Cleavage and Polyadenylation Factors