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American Journal of Pathology, Vol 143, 240-249, Copyright © 1993 by American Society for Investigative Pathology
REGULAR ARTICLES |
JA Regezi, LA MacPhail, TE Daniels, YG DeSouza, JS Greenspan and D Greenspan
Department of Stomatology, School of Dentistry, University of California, San Francisco 94143-0424.
Cell lineage and cell function antigens were studied immunohistochemically in human immunodeficiency virus-associated oral Kaposi's sarcoma to provide insight into tumor pathogenesis. All tumors were composed predominantly of spindle cells that expressed endothelium- associated antigens, CD34 and CD36 (factor VIII-related antigen was expressed by considerably fewer numbers of tumor cells). Infrequently, spindle tumor cells also expressed actin. Factor XIIIa positive spindle and dendritic stromal cells comprised up to 9% of the tumor cell population. Other spindle and dendritic cells expressing macrophage- associated antigen, CD68, accounted for up to 15% of the tumor cells. Mast cells occurred frequently within and around tumors. Leukocyte function antigen (CD18) was expressed by approximately 13% of tumor cells, and its ligand, intercellular adhesion molecule (ICAM), was expressed by some tumor-associated capillaries (which also expressed endothelial leukocyte adhesion molecule, ELAM) and occasional stromal cells. Staining for proliferating cell nuclear antigen was noted in both interstitial and vascular lining cells. All tumors were non- reactive for human Papillomavirus antigen and HIV p24 antigen. Oral KS is a heterogeneous cellular proliferation composed predominantly of endothelial or endothelium-related spindle cells. Other spindle/dendritic (XIIIa-positive and CD68-positive) cells and mast cells are also present and may contribute to tumor development. ICAM and ELAM expression within tumors may assist infiltration of macrophages and other inflammatory cells into these lesions.
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