title: A combined morphologic and immunologic approach to the diagnosis of gastrointestinal lymphomas: I. Malignant lymphoma of the stomach (a clinicopathologic study of 22 cases).
abstract: Twenty-two cases of primary gastric non-Hodgkin's lymphoma, which occurred over a 20-year period, were reviewed. Eighteen tumors were studied using an immunoperoxidase method, and the presence of intracytoplasmic monoclonal immunoglobulin (Ig) in nine (50%) suggested a B-cell origin. Four tumors (22%) contained intracytoplasmic muramidase (lysozyme), suggesting a true histiocytic origin. Five tumors (28%) did not contain immunoglobulin or muramidase. The muramidase-positive "true histiocytic lymphoma" could not be differentiated from histiocytic lymphoma of lymphocytic origin using light microscopic examination alone. The patients with B-cell lymphoma survived significantly longer than patients in the other two groups. The differentiation between true histiocytic lymphoma and other conditions is discussed.
mesh_terms: D000368:Aged; D000911:Antibodies, Monoclonal / Q000032:analysis; D001402:B-Lymphocytes; D005260:Female; D006801:Humans; D016403:Lymphoma, Large B-Cell, Diffuse / Q000175:diagnosis / Q000276:immunology* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D013274:Stomach Neoplasms / Q000175:diagnosis / Q000276:immunology* / Q000473:pathology
chemical_list: D000911:Antibodies, Monoclonal