title: Characteristic karyotypic pattern in T-cell lymphoproliferative disorders with reactive "angioimmunoblastic lymphadenopathy with dysproteinemia-type" features.
abstract: We report the clinical, histological, immunophenotypic, and cytogenetic findings in ten patients with T-cell lymphoproliferative disorders demonstrating reactive "angioimmunoblastic lymphadenopathy with dysproteinemia (AILD)-type" features. Fifteen available specimens were diagnosed as atypical hyperplasias (four) or malignant lymphomas (11). The latter were classified as AILD-type (five), T-zone (four), lymphoepithelioid (one), and low-grade, unclassified lymphoma (one). Despite the histologic differences, all these lesions shared minor nuclear atypicalities and reactive AILD-type features such as prominent vascularity, plasma cells, eosinophils, macrophages, and residual germinal centers. All lesions were immunophenotyped as predominantly T cell. The chromosome pattern was characterized by the frequent presence of karyotypically unrelated abnormal clones and/or cells with nonclonal chromosome abnormalities, a large population of normal mitotic cells, and a high incidence of trisomies 3 and 5. Sequential cytogenetic and histologic studies in five patients revealed that atypical hyperplasia and lymphoma with AILD-type features shared the same cytogenetic characteristics, ie, an unstable coexistence of normal mitotic cells and small-clonal and/or nonclonal abnormal cells, and that histologic transformation from low-grade lymphoma to immunoblastic lymphoma was accompanied by a selective proliferation of abnormal clonal cells. The AILD-type histology and the characteristic karyotypic pattern may be the expression of a specific pathogenesis and may warrant the separation of these neoplasias from other peripheral T-cell lymphomas.
authors.affiliation: Department of Laboratory Medicine, Saitama Cancer Center, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kaneko
authors.forename: N
authors.initials: N
authors.lastname: Maseki
authors.forename: M
authors.initials: M
authors.lastname: Sakurai
authors.forename: S
authors.initials: S
authors.lastname: Takayama
authors.forename: K
authors.initials: K
authors.lastname: Nanba
authors.forename: M
authors.initials: M
authors.lastname: Kikuchi
authors.forename: G
authors.initials: G
authors.lastname: Frizzera
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D002869:Chromosome Aberrations; D005260:Female; D006801:Humans; D007119:Immunoblastic Lymphadenopathy / Q000235:genetics* / Q000276:immunology / Q000473:pathology; D007621:Karyotyping; D008198:Lymph Nodes / Q000473:pathology; D008297:Male; D008875:Middle Aged; D008938:Mitosis; D010641:Phenotype; D013601:T-Lymphocytes / Q000145:classification
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte