Polymorphic reticulosis is a neoplasm of large granular lymphocytes with CD3+ phenotype

• Published in: Cancer 1995-02, Vol.75 (3), p.894-901
• Main Authors: Aozasa, Katsuyuki, Ohsawa, Masahiko, Tomita, Yasuhiko, Tagawa, Shinichi, Yamamura, Teiichi
• Format: Article
• Language: English
• Subjects: Adult; Base Sequence; Biological and medical sciences; CD3 Complex - metabolism; Epstein‐Barr virus; Female; Genome, Viral; Granuloma, Lethal Midline - immunology; Granuloma, Lethal Midline - pathology; Granuloma, Lethal Midline - virology; Hematologic and hematopoietic diseases; Herpesvirus 4, Human - genetics; Herpesvirus 4, Human - isolation & purification; Humans; Immunohistochemistry; Immunophenotyping; In Situ Hybridization; large granular lymphocytes; lethal midline granuloma; Leukemias. Malignant lymphomas. Malignant reticulosis. Myelofibrosis; Lymphatic Diseases - immunology; Lymphatic Diseases - pathology; Lymphatic Diseases - virology; Lymphoma, T-Cell - immunology; Lymphoma, T-Cell - pathology; Lymphoma, T-Cell - virology; Male; Medical sciences; Microscopy, Electron; Middle Aged; Molecular Sequence Data; nasal T‐cell lymphoma; Nose Neoplasms - immunology; Nose Neoplasms - pathology; Nose Neoplasms - virology; Polymerase Chain Reaction; polymorphic reticulosis; T-Lymphocytes - immunology; T-Lymphocytes - pathology; T-Lymphocytes - virology
• ISSN: 0008-543X; 1097-0142
• DOI: 10.1002/1097-0142(19950201)75:3<894::AID-CNCR2820750322>3.0.CO;2-I

Background. Polymorphic reticulosis, a type of lethal midline granuloma (LMG), has been referred to as nasal T‐cell lymphoma (NTL) because of its proliferating cells' positive reactivity to anti‐T‐lymphocyte antibodies. Recently, several studies have suggested that proliferating cells in NTL may be natural killer (NK) in nature. NK cells and human nonmajor histocompatibility‐restricted cytotoxic T‐lymphocytes have the morphology of large granular lymphocytes (LGL) (i.e., a high cytoplasmic: nuclear ratio and cytoplasmic granules). Whether NTL‐LMG possesses an LGL morphology is examined in this study. Methods. Two lymph node smears, peripheral blood showing a leukemic picture, and an electron microscope (EM) examination of a cutaneous lesion, respectively, were obtained from four patients with NTL‐LMG. Immunohistochemical examination of the proliferating cells and of the Epstein‐Barr virus (EBV) genome by both polymerase chain reaction and in situ hybridization also were performed. Results. All patients presented with necrotic and granulomatous lesions in the upper respiratory tract. Histology showed polymorphous cellular infiltrates containing large atypical cells with positive reaction to CD3 (three patients), CD43 (two patients), CD45RO (two patients), and OPD4 (one patient). Imprint smears revealed azurophilic large membrane‐delimited granules in an ample cytoplasm, which was confirmed by EM. The presence of the EBV genome in the tumor cells was observed in one patient. Conclusion. The current findings showed that NTL‐LMG or polymorphic reticulosis is a proliferation of LGL with a CD3+ phenotype. Cancer 1995; 75:894‐901.