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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Energy & fuels 2 (1988), S. 282-289 
    ISSN: 1520-5029
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1365-4632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A 68-year-old white woman was referred to us by her rheumatologist for possible participation in a clinical study of photopheresis for scleroderma. In February 1993, she noticed edema of her distal phalanges, Raynaud's phenomenon in both hands, flu-like symptoms, fatigue, intermittent diarrhea, abdominal pain, tearing in both eyes, dyspnea on exertion, dysphagia, and odynophagia. Bilateral silicone-gel breast implants had been placed 12 years before; 2 months before her present evaluation, they were removed and found to be ruptured.Physical examination revealed edema, limited to the fingers and hands bilaterally, and slight induration of the skin on the dorsum of both hands and distal forearms. The remainder of the physical examination was normal.According to our study protocol, a skin biopsy specimen from the dorsum of the right hand was taken, but all other laboratory investigations were refused. Histopathologic examination revealed multiple clear spaces of varying sizes in the dermis and multinucleated macrophages containing small refractile particles, characteristic of silicone granuloma (Figs. 1 and 2); however, the specimen showed no evidence of scleroderma. X-ray energy dispersive analysis by scanning electron-microscopy confirmed the presence of elemental silicon in the small refractile particles.The patient did not receive any treatment after her diagnosis and shortly thereafter, she was lost to follow-up.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 748 (1994), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 748 (1994), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Munksgaard International Publishers
    Journal of cutaneous pathology 29 (2002), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background:  Fascin containing actin bundles provide mechanical support to cellular protrusions and stress fibers. In cancers, some malignant cells (e.g. subsets of breast and ovarian carcinomas) express fascin. In skin cancer, the role of fascin is unknown.Methods:  Cases of 61 keratocytic neoplasms, 35 melanocytic neoplasms, nine extramammary Paget's disease (four with adenocarcinoma) and five sarcomas (angiosarcoma and atypical fibroxanthoma) were examined by immunohistochemistry, using monoclonal antihuman fascin antibody, clone 55 k-2 (Dako Corporation, Carpinteria, CA, USA).Results:  Fascin labeled all sarcomas and all keratinocytic neoplasms except for pagetoid pattern Bowen's disease. The regions of most intense fascin labeling were seen in the basal cells of infiltrative tumor margins. A minority of Merkel cell carcinomas exhibited weak or absent immunoreactivity. All melanocytic nevi except for some junctional nests of dysplastic melanocytic nevi expressed fascin. However, pagetoid cells of melanoma in situ and epithelioid cells of invasive melanoma weakly expressed or did not express fascin, whereas melanoma cells exhibiting spindle cell morphologies labeled intensely with fascin. Lastly, all cells of extramammary Paget's disease and most associated adenocarcinomas cells did not or were faintly labeled by fascin antibodies. Decreased or absent fascin expression was significantly associated with skin cancers with a high risk for metastasis (e.g. melanoma) vs. those with a low risk (e.g. basal cell carcinoma) (24% vs. 100% with 〉 50% immunoreactivity; p = 0.0001, chi-squared test).Conclusion:  Fascin is expressed by skin tumors that locally infiltrate and replace surrounding tissues indicating a role for fascin in cell adhesion, cell motility and invasiveness. No or weak fascin expression is exhibited by cancers with pagetoid intraepidermal spread and by invasive tumors with a high risk of metastasis. Downregulation or loss of fascin's actin-bundling properties, probably associated with disorganization of cell–cell and cell–matrix contacts, may be a crucial step in the progression from locally invasive to widely disseminating cancers.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cutaneous pathology 26 (1999), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Disruption of the cell-cycle regulation through over-expression or mutation of cyclins and cyclin-dependent kinases has been implicated in carcinogenesis. In order to determine whether keratoacanthoma (KA) is unique or a variant of squamous cell carcinoma (SCC) and whether expression of mitosis-related antigens are associated with KAs’tendency to regress, we compared the immunohistochemiral expression of mitotic cyclins (cyclins A and B) and their cyclin-dependent kinase p34cde2 in 21 KAs, 8 regressing KAs, and 28 conventional squamous cell carcinomas. KAs showed both overlap and significant differences in expression of these mitosis-related antigens compared to SCCs. Basal and parabasal pattern of expression of cyclins A and B significantly predominated in KAs in contrast to SCCs which exhibited diffuse pattern (cyclin A 86%/cyclin B 64% vs. 25%/36%, p〈0.01). However, no differences in the highest mean level of expression in‘hot spot’loci of cyclins A and B were identified comparing KAs to SCCs (19%/12% vs. 25%/13%, p〉0.05). For the cyclin-dependent kinase p34cde2, no differences in pattern, distribution or mean levels of expression were found. For cyclins A and B, regressing KA showed significantly more regional tumor labeling (88%/88% vs. 57%/33%, p=0.03) and a lower mean level of immunoreactivity (5%/4% vs. 19%/12%, p=0.001) compared to mature KAs. These findings indicate a role for mitotic cyclins in the evolution of both SCC and KA. The overlapping patterns of expression for these mitosis-related antigens suggest that KAs represent a variant of SCC that exhibit an overwhelming but not absolute tendency to involute.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Copenhagen : Munksgaard International Publishers
    Journal of cutaneous pathology 27 (2000), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Malignant melanoma (MM) is considered to be a chemotherapy-refractory tumor. New anti-cancer drugs (e.g. etoposide) that target DNA topoisomerases (e.g. topoisomerase II-alpha (topo IIα)) show activity against a wide variety of solid tumors. In this study, we investigated the frequency and rate of labeling for topo IIα in 163 MMs (primary and metastatic) and 67 melanocytic nevi to determine whether topo IIα expression is elevated in MM. Primary MM exhibited significantly more frequent topo IIα expression compared to benign nevi (86% vs. 56%, p=0.0001). The rate of topo IIα labeling in dysplastic melanocytic nevi, radial growth phase MM, vertical growth phase MM and metastatic MM revealed significant differences amongst groups and a positive covariance with advancing stage (means: 0.3, 0.5, 5, and 8 ‘+’ cells/hpf, respectively; r=0.3, all p≤0.02). Topo IIα labeling significantly correlated with increasing mitotic activity, depth of invasion and Clark's level, diminishing tumor infiltrating lymphocytes, and poor outcome (all p≤0.01) in primary MM. For metastatic MM, a minority (30%) exhibited marked elevation of topo IIα expression. These findings indicate topo IIα as a potential therapeutic target and marker for MM. Immunohistochemical analysis of disseminated MM may allow for correlation with clinical response and enable selection of candidates sensitive for specific chemotherapy ( /〉).
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-2568
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Although pentagastrin has a tropic action on intestinal mucosa in suckling rat pups, and at weaning a rise in gastrin levels coincides with maturation of the intestinal mucosa, direct correlations of serum gastrin levels and intestinal maturation have yet to be made. Ten-day-old rats were subjected either to antrectomy to produce a 43% decrease in serum gastrin levels or to fundectomy to produce a 319% increase over gastrin levels in rumenectomized or normal animals. These changes were not associated with tropic or adaptive changes in jejunal or colonic mucosa as determined by jejunal and colonic DNA content, jejunal sucrase activity, jejunal villous height, or crypt depths in jejunum and colon at the beginning (day 15), middle (day 21), or end (day 27) of the weaning period. To the contrary, an inverse relation was found between serum gastrin levels and both jejunal mucosal DNA content and sucrase activity as an index of maturation.
    Type of Medium: Electronic Resource
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