title: Oligoclonal T cell proliferative disorder in combined immunodeficiency.
abstract: Oligoclonal lymphoid proliferations may occur in immunocompromised patients and in the elderly. So far these proliferations have been shown to be of B cell origin. We describe a patient with a combined immunodeficiency, characterized by profound hypogammaglobulinemia and the initial absence of T lymphocytes in the peripheral blood (PB). From the age of 4 yr CD3+ T cells appeared in PB in rising numbers. These cells mainly expressed the CD4-/CD8+ phenotype (CD4/CD8 ratio: 0.1). Despite the emergence of T lymphocytes no proliferation of PB mononuclear cells could be induced with phytohemagglutinin, concanavalin A, or pokeweed mitogen. Between the ages of 4 and 6 yr the patient gradually developed hepatosplenomegaly and an interstitial pulmonary infiltrate of unknown origin, necessitating biopsies of both liver and lung. Infiltrates consisting of CD8+ T lymphocytes were found in the liver as well as the lung. CD8+ T cells were also abundant in the bronchoalveolar lavage fluid. Southern blot analysis of mononuclear cells from PB and of a lung biopsy specimen was performed to investigate if a clonal T cell population was involved. Analysis of the T cell receptor beta genes revealed that at least three expanded T cell clones were present in PB, one of which had invaded the lung. Thus far, i.e. 2 yr after the initial detection of clonal T cell receptor beta gene rearrangements, there have been no clinical or histologic signs of malignant behavior. We conclude that this combined immunodeficiency patient has a benign oligoclonal T cell lymphoproliferative disorder. Similar proliferations might well occur in other immunodeficiency states, whether primary or acquired.
authors.affiliation: Department of Pediatrics, Academic Hospital Rotterdam/Erasmus University, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Frenkel
authors.forename: H J
authors.initials: HJ
authors.lastname: Neijens
authors.forename: J C
authors.initials: JC
authors.lastname: den Hollander
authors.forename: I L
authors.initials: IL
authors.lastname: Wolvers-Tettero
authors.forename: J J
authors.initials: JJ
authors.lastname: van Dongen
mesh_terms: D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D015139:Blotting, Southern; D016827:CD8 Antigens; D002648:Child; D002675:Child, Preschool; D002999:Clone Cells / Q000032:analysis; D006801:Humans; D007153:Immunologic Deficiency Syndromes / Q000235:genetics / Q000473:pathology*; D008297:Male; D011948:Receptors, Antigen, T-Cell / Q000235:genetics; D016693:Receptors, Antigen, T-Cell, alpha-beta; D013601:T-Lymphocytes / Q000473:pathology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D016827:CD8 Antigens; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta