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  • Title: Pseudo Felty's syndrome. A polyclonal disease with a favorable prognosis. Report of two cases with Southern blot analysis of TCR.
    Author: Toussirot E, Lafforgue P, Harle JR, Kaplanski S, Mannoni P, Acquaviva PC.
    Journal: Clin Exp Rheumatol; 1993; 11(6):591-5. PubMed ID: 8299249.
    Abstract:
    The authors report two patients with large granular lymphocyte (LGL) expansion associated with rheumatoid arthritis corresponding to pseudo Felty's syndrome. These cells have natural killer and T cell surface antigen markers. LGL are a heterogeneous population and expansion of these cells is responsible for leukemia, which is generally a monoclonal proliferation. It has been suggested that Epstein-Barr virus (EBV) is a putative agent in this leukemia. No EBV DNA was found with a polymerase chain reaction analysis in the lymphocyte DNA of our two patients. Some cases of pseudo Felty's syndrome have exhibited a monoclonal pattern on Southern blot analysis of the T cell receptor. On the contrary, our two cases showed a polyclonal pattern with TCR beta chain Southern blot analysis. This fact, associated with the mild course seen in both over more than twenty years, suggest that pseudo Felty's syndrome is a disease with a good prognosis.
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