OBJECTIVETo investigate clinicopathologic features, immunophenotypes and differential diagnoses of follicular dendritic cell sarcoma/tumor (FDCS).

METHODSEight cases of FDCS were studied using histological and immunohistochemical examinations and EBER in situ hybridization, with a review of the related literatures.

RESULTSThere were 5 male and 3 female patients with a median age of 50 years. The sites of involvement included lymph node (4 cases), tonsil, nasopharynx, liver, and spleen (1 case each, respectively). The predominant microscopic features histologically included storiform, fascicular, diffuse, whorled and nodular in patterns. The neoplastic cells, dispersed by the infiltrated small lymphocytes, were characterized by abundant eosinophilic or fine granular cytoplasm with indistinct cell borders, and syncytial in appearance. The nuclei of the tumors were ovoid, round to spindled in shape with vesicular or stippled chromatin and small distinct nucleoli. Mitotic figures varied among cases. Pseudovascular spaces and perivascular cuffing were observed in some cases. One case of FDCS involving lesion in liver showed a background of abundant lymphocytes mixing with dispersed spindle or ovoid neoplastic cells having delicate chromatin, mild nuclear atypia, irregular/vesicular nuclei and distinct nucleoli. The neoplastic cells were positive for CD21, CD35, clusterin, and weakly positive for CD68, EMA, S-100 and EGFR. Ki-67 stain showed a variable expression among cases. EBER was positive in 2 cases.

CONCLUSIONSFDCS is a rare malignant tumor with a tendency to relapse and metastasis. Combined morphological and immunophenotypical analysis is necessary to reach a correct diagnosis.

Adult ; Aged ; Antigens, CD ; analysis ; immunology ; Antigens, Differentiation, Myelomonocytic ; analysis ; immunology ; Dendritic Cell Sarcoma, Follicular ; metabolism ; pathology ; Dendritic Cells ; pathology ; Female ; Giant Cells ; Humans ; Immunophenotyping ; methods ; Male ; Middle Aged ; Receptors, Complement 3d ; analysis ; immunology ; Treatment Outcome

OBJECTIVETo understand Epstein-Barr virus (EBV) infection of gastric carcinoma cells.

METHODSThe authors tested the infection of a signet ring cell line HSC-39 derived from human gastric carcinoma with Akata and P3HR-1 strains of EBV. Akata and P3HR-1 infected of EBV cell clones were isolated by a limiting dilution method.

RESULTSEBV-encoded small RNAs (EBERs) were expressed in the infected cells with each EBV strain by in situ hybridization. The EBV infected parental cells and most clones expressed EBNA1, but not EBNA2, latent membrane protein (LMP) 1 and LMP2A. Both EBV strains infected parental cells and clones presented type I latency. The uninfected HSC-39 cells were negative for CD21 expression; however, the Akata but not P3HR-1-infected clones were positive for CD21 expression at mRNA level.

CONCLUSIONThese results demonstrated that EBV infecting HSC-39 by CD21-independent pathway. This study also defined a signet ring cell line as a new target for EBV.

Carcinoma, Signet Ring Cell ; pathology ; virology ; Cell Line, Tumor ; Epstein-Barr Virus Nuclear Antigens ; analysis ; Herpesvirus 4, Human ; genetics ; physiology ; Humans ; RNA, Messenger ; RNA, Viral ; analysis ; Receptors, Complement 3d ; analysis ; genetics ; physiology ; Stomach Neoplasms ; pathology ; virology

We investigated the clinical and biological significance of germinal centers (GC) present in the minor salivary glands of patients with Sjogren's syndrome (SS). Minor salivary gland tissue biopsies from 93 patients with SS were used to identify GC-like structures, which were confirmed by CD21-positive follicular dendritic cell networks. Patients were compared based upon sociodemographics, glandular and extraglandular manifestations, and laboratory findings including autoantibody profiles, complement, and immunoglobulin levels; EULAR SS disease activity index (ESSDAI) and SS disease damage index (SSDDI) were also measured. GC-like structures were observed in 28 of 93 SS patients (30.1%). Mean focus scores and CRP levels were significantly higher in GC-positive patients than in GC-negative patients; GC-positive patients also exhibit a higher prevalence of rheumatoid factor and anti-SS-A/Ro antibodies compared to GC-negative patients. No differences in glandular or extra-glandular manifestations were evident between groups. In conclusion, SS patients with GC-like structures in the minor salivary glands exhibited laboratory profiles significantly different from those of their GC-negative counterparts. Long-term follow-up of these patients will be necessary to determine whether these laboratory abnormalities are predictive of clinical outcomes.
Adult ; Autoantibodies/blood ; C-Reactive Protein/analysis ; Demography ; Female ; Germinal Center/*pathology ; Humans ; Immunohistochemistry ; Male ; Middle Aged ; Receptors, Complement 3d/metabolism ; Retrospective Studies ; Salivary Glands, Minor/*pathology ; Sjogren's Syndrome/immunology/metabolism/*pathology

We investigated the clinical and biological significance of germinal centers (GC) present in the minor salivary glands of patients with Sjogren's syndrome (SS). Minor salivary gland tissue biopsies from 93 patients with SS were used to identify GC-like structures, which were confirmed by CD21-positive follicular dendritic cell networks. Patients were compared based upon sociodemographics, glandular and extraglandular manifestations, and laboratory findings including autoantibody profiles, complement, and immunoglobulin levels; EULAR SS disease activity index (ESSDAI) and SS disease damage index (SSDDI) were also measured. GC-like structures were observed in 28 of 93 SS patients (30.1%). Mean focus scores and CRP levels were significantly higher in GC-positive patients than in GC-negative patients; GC-positive patients also exhibit a higher prevalence of rheumatoid factor and anti-SS-A/Ro antibodies compared to GC-negative patients. No differences in glandular or extra-glandular manifestations were evident between groups. In conclusion, SS patients with GC-like structures in the minor salivary glands exhibited laboratory profiles significantly different from those of their GC-negative counterparts. Long-term follow-up of these patients will be necessary to determine whether these laboratory abnormalities are predictive of clinical outcomes.
Adult ; Autoantibodies/blood ; C-Reactive Protein/analysis ; Demography ; Female ; Germinal Center/*pathology ; Humans ; Immunohistochemistry ; Male ; Middle Aged ; Receptors, Complement 3d/metabolism ; Retrospective Studies ; Salivary Glands, Minor/*pathology ; Sjogren's Syndrome/immunology/metabolism/*pathology

Castleman's disease represents an atypical lymphoproliferative disorder, infrequently associated with various immunologic abnormalities or subsequent development of malignancy such as Kaposi sarcoma, malignant lymphoma and plasmacytoma. Its clinicopathologic features depend on various etiologic factors such as Kaposi sarcoma herpesvirus (KSHV), oversecretion of IL-6, adhesion molecule and follicular dendritic cell dysplasia, etc. To investigate the relationship of Castleman's disease (CD) and the above factors, we reviewed 22 cases of CD. Four cases of KSHV positive CD were detected, all multicentric, plasma cell type, and these cases displayed prominent vascular proliferation, characteristic 'Kaposi-like lesion'. IL-6 and CD54 positive mononuclear cells were scattered in interfollicular areas of KSHV positive cases. Follicular dendritic cell hyperplasia, vascular proliferation, expression of IL-6 and CD54 did not show any significant difference between solitary vs multicentric type, and plasma cell type vs hyaline vascular type. Our study suggests that KSHV positive CD reveals unique pathologic features, and the probable relationship of KSHV and IL-6 and CD54 is discussed.
Adolescence ; Adult ; Biological Markers ; Dendritic Cells, Follicular/pathology ; Epstein-Barr Virus Infections/virology ; Epstein-Barr Virus Infections/epidemiology ; Female ; Germinal Center/pathology ; Giant Lymph Node Hyperplasia/virology ; Giant Lymph Node Hyperplasia/pathology+ACo- ; Giant Lymph Node Hyperplasia/epidemiology ; Giant Lymph Node Hyperplasia/classification ; Herpesviridae Infections/virology ; Herpesviridae Infections/epidemiology ; Herpesvirus 4, Human/isolation +ACY- purification ; Herpesvirus, Kaposi Sarcoma-Associated/isolation +ACY- purification ; Human ; Hyperplasia ; Intercellular Adhesion Molecule-1/analysis ; Interleukin-6/analysis ; Korea/epidemiology ; Lymph Nodes/virology ; Lymph Nodes/pathology ; Lymph Nodes/chemistry ; Male ; Middle Age ; Neovascularization, Pathologic ; Receptors, Complement 3d/analysis ; Retrospective Studies ; Tumor Virus Infections/virology ; Tumor Virus Infections/epidemiology