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Phenotypic changes of lymphocyte in a patient with IgG4-related disease after corticosteroid therapy
  1. Shigeru Iwata,
  2. Kazuyoshi Saito,
  3. Shintaro Hirata,
  4. Yoshiya Tanaka
  1. The First Department of Internal Medicine, School of Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan
  1. Correspondence to Yoshiya Tanaka, University of Occupational and Environmental Health, Japan, The First Department of Internal Medicine, School of Medicine, 1-1 Iseigaoka, Yahatanishi Ward, Kitakyushu 807-8555, Fukuoka Prefecture, Japan; tanaka{at}med.uoeh-u.ac.jp

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Immunoglobulin G4-related disease (IgG4RD) is a novel clinical disease entity characterised by elevated serum IgG4 and tissue infiltration by IgG4-positive plasma cells.1 ,2 Interleukin 4 (IL-4) and IL-10, which were detected with B cells in the salivary gland in this disease,3 direct naive B cells to switch to IgG4 production.4 B cells are therefore considered to be important for the pathogenesis of IgG4RD. However, the phenotype of B cells in patients with IgG4RD remains elusive. In this report we show the phenotypic changes of peripheral blood B cells in a patient with IgG4RD analysed by flow cytometry during treatment with a corticosteroid.

In January 2011 a 53-year-old man presented with symmetrical swelling of the lachrymal glands and a tumour located in the left junction of the renal pelvis and ureter, serum IgG4 >135 mg/dl and IgG4+/IgG+ cells >40% with significant invasion of lymphocytes and plasma cells, typical tissue fibrosis and sclerosis in the salivary gland. He was diagnosed with …

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