title: Programmed death-1 (PD-1) is a marker of germinal center-associated T cells and angioimmunoblastic T-cell lymphoma.
abstract: Programmed death-1 (PD-1), a member of the CD28 costimulatory receptor family, is expressed by germinal center-associated T cells in reactive lymphoid tissue. In a study of a wide range of lymphoproliferative disorders, neoplastic T cells in 23 cases of angioimmunoblastic lymphoma were immunoreactive for PD-1, but other subtypes of T cell and B cell non-Hodgkin lymphoma, as well as classic Hodgkin lymphoma, did not express PD-1. The pattern of PD-1 immunostaining of neoplastic cells in angioimmunoblastic lymphoma was similar to that reported for CD10, a recently described marker of neoplastic T cells in angioimmunoblastic lymphoma. Tumor-associated follicular dendritic cells in cases of angioimmunoblastic lymphoma were found to express PD-L1, the PD-1 ligand. In addition, PD-1-positive reactive T cells formed rosettes around neoplastic L&H cells in 14 cases of nodular lymphocyte predominant Hodgkin lymphoma studied. These findings, along with data from previous studies, suggest that angioimmunoblastic lymphoma is a neoplasm of germinal center-associated T cells and that there is an association of germinal center-associated T cells and neoplastic cells in nodular lymphocyte predominant Hodgkin lymphoma. PD-1 is a useful new marker for angioimmunoblastic lymphoma and lends further support to a model of T-cell lymphomagenesis in which specific subtypes of T cells may undergo neoplastic transformation and result in specific, distinct histologic, immunophenotypic, and clinical subtypes of T-cell neoplasia.
authors.affiliation: Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA. ddorfman@partners.org
authors.forename: David M
authors.initials: DM
authors.lastname: Dorfman
authors.forename: Julia A
authors.initials: JA
authors.lastname: Brown
authors.forename: Aliakbar
authors.initials: A
authors.lastname: Shahsafaei
authors.forename: Gordon J
authors.initials: GJ
authors.lastname: Freeman
mesh_terms: D015703:Antigens, CD / Q000378:metabolism*; D051017:Apoptosis Regulatory Proteins / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000378:metabolism*; D018858:Germinal Center / Q000378:metabolism / Q000473:pathology*; D006801:Humans; D007119:Immunoblastic Lymphadenopathy / Q000150:complications / Q000378:metabolism / Q000473:pathology*; D007124:Immunoenzyme Techniques; D016393:Lymphoma, B-Cell / Q000378:metabolism / Q000473:pathology*; D016399:Lymphoma, T-Cell / Q000150:complications / Q000378:metabolism / Q000473:pathology*; D061026:Programmed Cell Death 1 Receptor; D013601:T-Lymphocytes / Q000378:metabolism / Q000473:pathology*
chemical_list: D015703:Antigens, CD; D051017:Apoptosis Regulatory Proteins; D014408:Biomarkers, Tumor; C105992:PDCD1 protein, human; D061026:Programmed Cell Death 1 Receptor