title: Are clonal T-cell large granular lymphocytes to blame for unexplained haematological abnormalities?
abstract: Abnormalities diagnosed on routine blood work, such as mild neutropenia, anaemia, thrombocytopenia and relative lymphocytosis, often have obscure aetiologies. A series of 30 patients were evaluated for various unexplained haematological abnormalities between 1997 and 2005, and found to have circulating monoclonal T-cell large granular lymphocytes (T-LGL). These patients fit the diagnosis of T-cell clonopathy of unknown significance (TCUS), which may represent a clinical spectrum of clonal T-LGL proliferation. Our patients were characterised by a complete absence of severe neutropenia (<0.5 x 10(9)/l), absence of recurrent neutropenic infection (0%), negative rheumatoid serology (0%) and a low incidence of constitutional symptoms (20%). This overall asymptomatic clinical presentation appeared to be different from other previously reported series of TCUS or T-LGL leukaemia who typically had symptomatology and required treatment. Our series of 30 patients represented the benign end of the spectrum of clonal T-LGL proliferation, and might reflect diagnosis at earlier stages of the condition relative to other reported series. TCUS may be a heterogeneous and under-diagnosed condition. This study further broadens our understanding of the clinical and laboratory manifestations of indolent clonal T-cell proliferation, and raises our awareness of this condition. We suggest that TCUS should be considered in the diagnostic evaluation of unexplained haematological problems.
authors.affiliation: Department of Hematology and Oncology, Newark Beth Israel Medical Center, Newark, NJ 07112, USA. isabnani@sbhcs.com
authors.forename: Indu
authors.initials: I
authors.lastname: Sabnani
authors.forename: Patricia
authors.initials: P
authors.lastname: Tsang
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015139:Blotting, Southern; D002999:Clone Cells; D018450:Disease Progression; D005260:Female; D005434:Flow Cytometry; D005500:Follow-Up Studies; D015329:Gene Rearrangement, T-Lymphocyte; D005838:Genotype; D006402:Hematologic Diseases / Q000276:immunology* / Q000473:pathology; D006801:Humans; D016130:Immunophenotyping; D008213:Lymphocyte Activation; D018655:Lymphocyte Count; D008218:Lymphocytosis; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D013601:T-Lymphocytes / Q000276:immunology* / Q000473:pathology