title: Malignant peripheral nerve sheath tumors: an immunohistochemical study in relation to ultrastructural features.
abstract: The constituent cells in malignant peripheral nerve sheath tumors were examined by studying the expression of immunohistochemical markers for Schwann cells and perineurial cells in relation to ultrastructural features in 12 malignant peripheral nerve sheath tumors. Ultrastructural studies demonstrated mixed proliferation of Schwann cells, perineurial cells, fibroblastic cells, and primitive cells in many malignant peripheral nerve sheath tumors. Expression of S-100 protein was well correlated with Schwann cell-like differentiation of tumor cells. However, Leu-7 and epithelial membrane antigen, which have been considered to be specific to Schwann cells and perineurial cells, respectively, were common to Schwann cells, perineurial cells, and primitive cells. The common immunophenotypic expression suggests a close relationship among these cell types. The unusual expression of cytokeratin could be explained by the plasticity of intermediate filament expression.
authors.affiliation: First Department of Pathology, University of Tokushima School of Medicine, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Hirose
authors.forename: T
authors.initials: T
authors.lastname: Hasegawa
authors.forename: E
authors.initials: E
authors.lastname: Kudo
authors.forename: K
authors.initials: K
authors.lastname: Seki
authors.forename: T
authors.initials: T
authors.lastname: Sano
authors.forename: K
authors.initials: K
authors.lastname: Hizawa
mesh_terms: D000328:Adult; D000368:Aged; D000943:Antigens, Differentiation / Q000032:analysis; D018959:CD57 Antigens; D003598:Cytoskeletal Proteins / Q000032:analysis; D003599:Cytoskeleton / Q000737:chemistry / Q000648:ultrastructure; D005260:Female; D005347:Fibroblasts / Q000737:chemistry / Q000473:pathology / Q000648:ultrastructure; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008562:Membrane Glycoproteins / Q000032:analysis; D008854:Microscopy, Electron; D008875:Middle Aged; D018396:Mucin-1; D010524:Peripheral Nervous System Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000648:ultrastructure; D009418:S100 Proteins / Q000032:analysis; D012583:Schwann Cells / Q000737:chemistry / Q000473:pathology / Q000648:ultrastructure
chemical_list: D000943:Antigens, Differentiation; D018959:CD57 Antigens; D003598:Cytoskeletal Proteins; D008562:Membrane Glycoproteins; D018396:Mucin-1; D009418:S100 Proteins