title: [Nasal NK-cell lymphoma].
abstract: A 75-year-old man was admitted to our hospital on June 1st, 1993, because of nasal obstruction, epistaxis, fever, night sweats and weight loss. Examination disclosed a 2-cm white necrotic mass in the nasal septum, and a biopsy disclosed non-Hodgkin's lymphoma, diffuse, mixed-type. Imprint smears showed cytoplasmic azurophilic granules in the tumor cells. Dense granules were demonstrated by electron microscopy. The tumor cells were CD1-2+3-4-7+8-16+56+57-, and T cell receptor genes were in germline configuration. NK activity against K562 was strongly positive. Based on morphologic, phenotypic, immunogenotypic, and cytotoxic findings, the tumor cells seemed to be derived from activated NK cells. Because the tumor cells were positive for the EB virus and CD21 antigen, EB virus seemed to have infected CD21-positive NK cells and transformed them. MDR P-glycoprotein was also positive. This finding may explain why nasal lymphomas are resistant to chemotherapy and have a poor prognosis.
authors.affiliation: Department of Hematology, Tokyo Women's Medical College.
authors.forename: J
authors.initials: J
authors.lastname: Fukuda
authors.forename: T
authors.initials: T
authors.lastname: Yoshihara
authors.forename: Y
authors.initials: Y
authors.lastname: Arai
authors.forename: T
authors.initials: T
authors.lastname: Kaneko
authors.forename: H
authors.initials: H
authors.lastname: Zheng
authors.forename: S
authors.initials: S
authors.lastname: Mori
authors.forename: M
authors.initials: M
authors.lastname: Aoyama
authors.forename: M
authors.initials: M
authors.lastname: Masuda
authors.forename: T
authors.initials: T
authors.lastname: Motoji
authors.forename: K
authors.initials: K
authors.lastname: Oshimi
mesh_terms: D002472:Cell Transformation, Viral; D004854:Herpesvirus 4, Human; D006801:Humans; D007694:Killer Cells, Natural / Q000276:immunology*; D008228:Lymphoma, Non-Hodgkin / Q000276:immunology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D009669:Nose Neoplasms / Q000276:immunology* / Q000473:pathology; D011379:Prognosis