title: Polyclonal B cell chronic lymphoproliferative disease with hairy cell morphology: a case report and clonal studies.
abstract: We describe a patient who has a chronic polyclonal B lymphocyte proliferation with a hairy-cell appearance. A 48-year-old Japanese woman with marked splenomegaly, systemic lymphadenopathy, and leukocytosis was referred to out hospital. Laboratory examination revealed marked polyclonal IgG hypergammaglobulinemia. Morphologic examination of the patient's peripheral blood, including May-Giemsa staining and scanning electron microscopy, showed a monotonous proliferation of hairy-appearing mature lymphocytes. An immunophenotypic study revealed an expansion of cells with mature B cell antigens positive for CD11c; however, light-chain restriction was not seen. The lack of both immuno-globulin heavy-chain and T cell receptor gene rearrangements by Southern blot analysis indicated the polyclonal nature of the proliferating B cells. This was confirmed further by a clonal analysis of the patient's lymphocytes using an X-chromosome-linked restriction fragment polymorphism within the X-linked phosphoglycerate kinase (PGK) gene. Since chronic B cell lymphoproliferation with a hairy cell appearance has not been described previously, this case might be extremely rare, and has important implication for the pathogenesis of mature B cell lymphoproliferative diseases, including hairy cell leukemia.
authors.affiliation: Department of Medicine, Kameda General Hospital, Chiba, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Matsue
authors.forename: H
authors.initials: H
authors.lastname: Nishi
authors.forename: S
authors.initials: S
authors.lastname: Onozawa
authors.forename: M
authors.initials: M
authors.lastname: Itoh
authors.forename: K
authors.initials: K
authors.lastname: Tsukuda
authors.forename: M
authors.initials: M
authors.lastname: Yamaguchi
authors.forename: S
authors.initials: S
authors.lastname: Nakao
authors.forename: M
authors.initials: M
authors.lastname: Kashimura
mesh_terms: D001402:B-Lymphocytes / Q000473:pathology*; D018845:CD11 Antigens / Q000276:immunology; D002455:Cell Division; D048429:Cell Size; D002908:Chronic Disease; D002999:Clone Cells; D005260:Female; D006801:Humans; D016130:Immunophenotyping; D007943:Leukemia, Hairy Cell / Q000473:pathology; D008232:Lymphoproliferative Disorders / Q000276:immunology / Q000473:pathology*; D008875:Middle Aged
chemical_list: D018845:CD11 Antigens