168 research outputs found
Angioimmunoblastic lymphadenopathy (AILD). Histopathologic and immunohistochemical study in three cases
No full textIn three cases of angioimmunoblastic lymphadenopathy (AILD) immunohistochemistry was performed. The results were correlated with histopathology. Immunohistochemical studies seem to be of great utility in AILD for diagnostic purpose, for differential diagnosis, for the prognosis and, finally for the comprehension of some pathogenetic mechanisms
Site-specific monoclonal antibodies against peanut agglutinin (PNA) from Arachis hypogaea. Immunohistochemical study of tissue-cultured cells and of 27 cases of Hodgkin's disease
No full textThe purpose of this study was to increase the sensitivity of the staining reaction for the T antigen on the surface of neoplastic cells grown in vitro with the use of site-specific monoclonal antibodies (MAbs). The authors describe anti-peanut agglutinin (PNA) MAbs selected by screening the hybridomas with PNA and PNA bound to bovine serum albumin conjugated with the T antigen. The selected hybridomas (F2C8, F3D12, F3A5) were then grown in pristane-sensitized mice or in the Amicon Hollow Fiber System (F2C8). The affinity constant values for PNA were measured, and all the purified MAbs were tested on both native and denatured PNA, wheat germ agglutinin, concanavalin A, and ricin by using the immunoassay dot test and immunoblotting methods. Eleven different cell lines were stained with the three MAbs; similar results were obtained with F2C8 and F3D12. In each case the fluorescence, if present, was associated with the cell membrane, and the intensity of the staining was always stronger when the cells were incubated with the MAbs than when stained with fluorescein-labeled PNA. On the other hand, F3A5 failed to stain unfixed cells preincubated with PNA but stained the same cells after fixation, independently of the presence of PNA. One of the antibodies, F2C8, was used to stain histologic preparations from 27 cases of Hodgkin's disease and was compared with the anti-granulocyte antibody, Leu-M1, which has been used by numerous authors to identify the characteristic Reed-Sternberg cells. The results obtained were qualitatively similar; ie, F2C8 was at least as efficient as anti-Leu-M1 in its ability to stain the typical diagnostic cells in Hodgkin's disease
Microcystic adenoma of the pancreas (glycogen-rich cystadenoma) with stromal amyloid deposits
No full textWe report a case of a pancreatic glycogen-rich microcystic serous adenoma with stromal amyloid deposits, focusing on the significance of isolated amyloid deposits in tumours.
The architectural pattern was characterized by thin-walled cysts lined by a single layer of flat or cuboidal epithelial cells intensely stained by the PAS-reaction only before diastase digestion, suggesting the presence of glycogen. Tumour stroma was composed of broad fibrocollagenous tissue with lamellar hyalinized areas which were positively stained by Congo red and showed green birefringence and dichroism with polarized light. For amyloid protein characterization, immunohistochemical studies were performed with anti-beta amyloid protein and anti-amyloid precursor pre-A4695. The former antibody diffusely stained tumour stroma, while the latter stained only scattered stroma cells.
This is the first documented case of amyloid deposition in pancreatic serous adenoma. We indicate that the source of amyloid is an APP-like precursor secreted by stromal myofibroblasts
Cancro delle fosse nasali e dei seni paranasali e esposizione a polveri di legno: studio caso-controllo.
No full textDistribution of type-I interferon-receptors in human first trimester and term placental tissues and on isolated trophoblast cells
No full textPROBLEM: Type-I interferon (IFN) is the protein recognizing pregnancy in ruminants. Although IFN is secreted in early pregnancy, its role is not still clear in other species. Like other cytokines, IFN exerts its biological functions through specific membrane receptors. We have investigated the potential action of IFN in human pregnancy by studying the distribution of the receptors in the human placenta. METHOD: Reactivity to monoclonal antibodies (mAbs) to the type-I IFN-receptor (R) was analyzed by immunohistochemistry in human placental tissues and in cytospins of first trimester trophoblast cells. RESULTS: Type-I IFN-R immunoreactivity was observed mostly in first trimester villous cytotrophoblasts and in the cytotrophoblast cell columns. Trophoblast in the decidua, the epithelium of the uterine glands, and most of the isolated trophoblast cells were also immunoreactive. CONCLUSION: The expression of type-I IFN-R in the highly proliferating and migrating trophoblast suggests that this cytokine has a role in trophoblast growth and invasion
Weekly chemotherapy in advanced prostatic cancer
No full textThis randomised phase II study was performed in order to evaluate the effectiveness of a weekly chemotherapy regimen in advanced prostatic carcinoma patients (stage D2) refractory to hormonal therapy. Seventy-two cases were studied: they were randomised in a 2:1 ratio to receive either epirubicin (30 mg m-2 weekly) or doxorubicin (25 mg m-2 weekly); 48 patients received epirubicin and 24 received doxorubicin. After 12 courses of chemotherapy, the 45 evaluable patients in the epirubicin arm showed a response rate of 37.7% and the 21 evaluable patients in the doxorubicin arm showed a response rate of 33.3% (P = 0.51). Pain intensity, bone and prostatic tumour markers rapidly and significantly decreased in responders. An improvement in physical symptoms, functional conditions and in emotional well-being was observed in the majority of the treated patients. The histological analysis of bone metastases, performed before and after 12 courses of chemotherapy showed a significant reduction in neoplastic invasion and in new bone formation in responders. Cardiac performance worsened in five out of 45 patients and in ten out of 21 during the first 12 courses of epirubicin or doxorubicin respectively (P = 0.014). The median survival was 12.5 months in the epirubicin arm and 8.0 months in the doxorubicin arm (P = 0.042). Our data indicate that in advanced prostatic carcinoma, a weekly epirubicin regimen may give rapid palliative results, similar to that of doxorubicin, but with less side-effects
Hematological findings in B-cell lymphoma by cytofluorographic analysis. Correlation wtih morphological findings
No full textHepatocarcinoma in a child with cholesterol ester storage disease
No full textA child developing hepatocarcinoma previously affected by with cholesterol ester storage disease is describe
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