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Medizinische Klinik des Universitätsklinikum Schleswig-Holstein, Campus Kiel. f.moosig@med2.uni-kiel.de
T-Large Granular Lymphocyte (T-LGL) leukaemia is a rare clonal disease characterized by neutropenia and/or anaemia. Because of its strong association with rheumatoid arthritis (RA), T-LGL leukaemia is an important differential diagnosis to Felty's syndrome. This differentiation might be especially difficult since, in severe RA with extraarticular manifestations, there is often an expanded memory effector T-cell population which can hardly be separated from T-LGL leukaemia cells by means of immunophenotyping. The main criterion for T-LGL leukaemia is the detection of a clonal T-cell-receptor rearrangement by PCR. First-line therapy consists of weekly low-dose methotrexate. Alternatively, other immunosuppressives or cytotoxic agents can be useful. There are very limited data from therapy studies. The German CLL study group has initiated a protocol using parenteral low-dose methotrexate as first-line therapy and fludarabine as second-line medication.
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