1,721,230 research outputs found
CAN REED-STERNBERG CELLS OF CLASSIC HODGKIN'S DISEASE BE CONSIDERED B-CELLS?
No full textDuring the last twenty years, the issue of the nature of Reed-Sternberg (RS) cells of Hodgkin's disease (HD) has been addressed by multiple methodological approaches. In recent times, a major insight into HD has been obtained through molecular studies of isolated cells which have proven the clonal nature of HD. In parallel to molecular investigations some novel biologic markers specifically associated with the different stages of mature B-cells have helped to define the cellular origin of HD. This review deals with histological features of HD and summarizes recent results from molecular and immunohistochemical studies focusing on the origin and the stage of differentiation of RS cells
Pathological features of lymphoid proliferations of the salivary glands: lymphoepithelial sialadenitis vs low-grade B-cell lymphoma of MALT-type
No full textMIXED RENAL TUMOR WITH CARCINOMATOUS AND FIBROLEIOMYOMATOUS COMPONENTS, ASSOCIATED WITH ANGIOMYOLIPOMA IN THE SAME KIDNEY
No full textA 54-year-old woman, without the stigmas of tuberous sclerosis, underwent radical nephrectomy for simultaneous occurrence of an Angiomyolipoma (AML) and a carcinomatous and fibroleiomyomatous mixed tumor in the same kidney, diagnosed by computerized tomography, selective renal arteriography and anatomopathological examination. The peculiar findings of the mixed neoplasia, characterized by a mixture of carcinomatous and fibroleiomuscular components are stressed. The latter component is considered to be a proliferative element interacting with the carcinomatous one. After review of the pertinent literature, this is the first example of an association of AML and renal cell carcinoma (RCC) in which the RCC is constituted by a mixture of carcinomatous and fibroleiomyomatous cells
IMMUNOHISTOCHEMICAL CHARACTERIZATION OF KI-M6 MONOCLONAL-ANTIBODY IN BOUIN-FIXED, PARAFFIN-EMBEDDED SECTIONS OF NORMAL AND NEOPLASTIC HUMAN TISSUES
No full textA monoclonal antibody (Ki-M6) against the CD 68 antigen, which labels cells of the monocyte/macrophage system, was tested on Bouin-fixed, paraffin-embedded samples of normal, reactive and neoplastic tissues by an avidin-biotin-peroxidase complex method, with the aim of establishing its value in diagnostic pathology. In normal human tissues, Ki-M6 reactivity was confined to the so-called resident macrophages populating normal organs under physiological conditions. Moreover, restricted reactivity against cells of macrophage lineage was observed in reactive and inflammatory lesions. Granulocytes, monocyte/macrophage-related immune accessory cells, and other analysed normal tissue structures did not reveal any reactivity. Ki-M6 was strongly reactive with the cases of benign (4/4) and malignant (15/15) fibrous histiocytomas, in addition to the true histiocytic lymphomas (3/3). Cases of granular cell tumour (2/3) showed strong reactivity with Ki-M6, whereas only few immunoreactive cells, with weak staining, were seen in the other Ki-M6-positive neoplasms [neurofibroma (3/3), benign schwannoma (1/2), ganglioneuroma (1/1), malignant schwannoma (5/9), melanoma (9/28), dermatofibrosarcoma protuberans (1/1), myelomonocytic leukaemia (3/3)]. Among the epithelial malignancies tested (47 cases), Ki-M6 was positive only in renal cell carcinoma (11/14). Malignant lymphomas of the Hodgkin (56 cases) and non-Hodgkin type (67 cases) were uniformly non-reactive. From these data, Ki-M6 appears to be an excellent marker of monocyte/macrophage-related cells and appears to be a reliable indicator for fibrous histiocytomas and true histiocytic malignancies. The availability of this additional antibody capable of staining routinely processed tissue is of practical interest
pathologic features of lymphoid proliferations of the salivary glands: MESA vs. Low-grade B-cell lymphoma of MALT.
No full textGENETIC PATHWAYS AND HISTOGENETIC MODELS OF AIDS-RELATED LYMPHOMAS
No full textAcquired immunodeficiency syndrome (AIDS)-related lymphomas consistently display a B-cell phenotype and are histogenetically related to germinal centre or post-germinal centre B cells in the overwhelming majority of cases. The pathogenesis of AIDS-related lymphoma is a multistep process involving factors provided by the host as well as alterations intrinsic to the tumour clone. The molecular pathways of viral infection and lesions of cancer-related genes associated with AIDS-related lymphomas vary substantially in different clinicopathological categories of the disease and highlight the marked degree of biological heterogeneity of these lymphomas
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