title: Expression of the intestinal T-lymphocyte associated molecule HML-1: analysis of 75 non-Hodgkin's lymphomas and description of the first HML-1 positive T-lymphoblastic tumour.
abstract: The expression of the gut intra-epithelial T-cell associated molecule HML-1, a trimeric protein of 150, 125, 105 kD, was studied in 75 T-cell lymphomas of different subtypes: 20 T-lymphoblastic lymphomas/leukaemias; 50 nodal peripheral T-cell lymphomas; and five intestinal T-cell lymphomas. Our results confirm: (i) the usefulness of the HML-1 monoclonal antibody as an immunohistochemical marker for intestinal T-cell lymphomas: and (ii) the lack of reactivity of HML-1 with nodal peripheral T-cell lymphomas. Moreover, expression of the HML-1 molecule was found for the first time in a case of T-lymphoblastic lymphoma/leukaemia. The patient presented with a mediastinal mass which consisted of HML-1 + neoplastic cells displaying a phenotypic profile consistent with early thymocytes. Genes coding for the alpha, beta, gamma and delta chains of the T-cell receptor were in a germline configuration. The neoplastic cells could have been derived from the small subset of HML-1 + thymocytes detectable in the cortex of normal human thymus.
authors.affiliation: Institute of Haematology, Perugia University, Italy.
authors.forename: B
authors.initials: B
authors.lastname: Falini
authors.forename: L
authors.initials: L
authors.lastname: Flenghi
authors.forename: M
authors.initials: M
authors.lastname: Fagioli
authors.forename: P G
authors.initials: PG
authors.lastname: Pelicci
authors.forename: H
authors.initials: H
authors.lastname: Stein
authors.forename: B
authors.initials: B
authors.lastname: Bigerna
authors.forename: S
authors.initials: S
authors.lastname: Pileri
authors.forename: M F
authors.initials: MF
authors.lastname: Martelli
mesh_terms: D000293:Adolescent; D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D000951:Antigens, Neoplasm / Q000032:analysis*; D014408:Biomarkers, Tumor / Q000032:analysis*; D015139:Blotting, Southern; D016827:CD8 Antigens; D006801:Humans; D016023:Integrins; D007414:Intestinal Neoplasms / Q000276:immunology*; D016399:Lymphoma, T-Cell / Q000276:immunology; D008297:Male; D008479:Mediastinal Neoplasms / Q000276:immunology; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000276:immunology*; D015375:Receptors, Interleukin-2 / Q000032:analysis; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D016827:CD8 Antigens; D016023:Integrins; D015375:Receptors, Interleukin-2; C070709:integrin alphaEbeta7