title: Chronic B-cell dyscrasias are an important clinical feature of T-LGL leukemia.
abstract: T cell large granular lymphocyte leukemia (T-LGL) is characterised by semiautonomous proliferation of monoclonal cytotoxic T lymphocytes, which can result in neutropenia, splenomegaly, and is associated with various autoimmune disorders, particularly rheumatoid arthritis. The coexistence of T-LGL leukemia with B cell abnormalities has previously been identified in case reports. However, no systematic analysis to determine the frequency of this co-association has been reported. Analysis of 63 T-LGL patients revealed a frequent association with humoral immune system abnormalities. We identified coexisting B cell dyscrasias in 17 T-LGL patients (27% of total), of whom 12 had monoclonal gammopathy of unknown significance (MGUS) (19%), and 5 had chronic lymphocytic leukemia (CLL) (8%). The presence of both MGUS and CLL was found in 2 patients (3%) and follicular lymphoma was identified with MGUS in another T-LGL patient (2%). Additionally, polyclonal hypergammaglobulinemia or hypogammaglobulinemia was found in 10 additional LGL leukemia patients bringing the total frequency of B cell abnormalities in T-LGL leukemia to 43% in our cohort. The co-association of B cell pathology with T-LGL suggests that either a common antigen drives clonal B and T cells, or that humoral malignancy could serve as the stimulus for lymphocyte expansion representing an overactive anti-tumour surveillance.
authors.affiliation: Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, OH, USA.
authors.forename: Aaron D
authors.initials: AD
authors.lastname: Viny
authors.forename: Alan
authors.initials: A
authors.lastname: Lichtin
authors.forename: Brad
authors.initials: B
authors.lastname: Pohlman
authors.forename: Thomas
authors.initials: T
authors.lastname: Loughran
authors.forename: Jaroslaw
authors.initials: J
authors.lastname: Maciejewski
mesh_terms: D000361:Agammaglobulinemia / Q000150:complications; D001402:B-Lymphocytes / Q000473:pathology*; D015897:Comorbidity; D006801:Humans; D006942:Hypergammaglobulinemia / Q000150:complications; D054066:Leukemia, Large Granular Lymphocytic / Q000150:complications / Q000209:etiology* / Q000473:pathology; D015451:Leukemia, Lymphocytic, Chronic, B-Cell / Q000150:complications; D008224:Lymphoma, Follicular / Q000150:complications; D008232:Lymphoproliferative Disorders / Q000150:complications* / Q000473:pathology; D008998:Monoclonal Gammopathy of Undetermined Significance / Q000150:complications