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  • 1
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Onkogene ; Tumormarker ; DNA-Ploidie ; Ultrastruktur ; Laryxkarzinom ; Key words Oncogenes ; Proliferative markers ; DNA-ploidy ; Laryngeal cancer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A comparison was made of the staining intensities of selected immunohistochemical proliferating antigens (p53, PCNA, Ki67), DNA flow-cytometry and ultrastructures of neoplastic cells from 120 cases of laryngeal cancers. Clinically very advanced tumors were in the majority (T3, 43%; T4, 18%). A 5-grade scale was adopted to evaluate the level of immunohistochemical staining of the carcinoma cell nuclei. Positive staining was obtained in 70% for p53, 57% for Ki67 and 80% for PCNA. Sixty-two percent of the cases were DNA-diploid and 38% DNA-aneuploid. The DNA-diploid carcinomas were accompanied by enlargement of the cell nuclei, preservation of wide margins of nuclear heterochromatin, enlargements of the nuclear areas and increases in the number of nuclei. In the aneuploid-polyploid cancers the nuclei had a substantial polymorphism, with large cleaved nuclei showing significant variations in size and having a nuclear envelope. A frequent finding was euchromatization of chromatin. Dense chromatin appeared in the form of small clumps spread over the whole area of these irregular nuclei. Enlargement and activation of nucleoli were found. There was a positive (chi-square) correlation between T- and N-stage and immunohistochemical staining. There was also a positive correlation in staining intensity between p53, Ki67 and PCNA markers and strong correlation between these markers for proliferative activity and the degree of aggressiveness of a tumor.
    Notes: Zusammenfassung Dieser Beitrag setzt sich um Ziel, die Profilierungsaktivität der Kehlkopfkrebszellen in bezug auf klinische Befunde zu bestimmen. Im Mittelpunkt unserer Untersuchungen stand das Krebsgewebe von 120 Larynxkarzinompatienten, bei denen eine chirurgische Behandlung, Radiotherapie bzw. kombinierte Therapie vorgenommen wurde. Das klinische Fortschreiten der Krankheit stuften wir bei 39 Kranken als Grad III und bei 31 Fällen als Grad IV ein. Immunhistochemische Untersuchungen führten wir mit der „Avidin-biothin-Methode” durch, wobei Peroxydase als Enzym und Diaminobezidin als Chromogen angewandt wurden. Für die Bestimmung der immunohistochemischen Färbung der Krebszellen benutzten wir eine 5stufige Skala. Eine positive Färbung der Zellkerne des Laynxkrebses mit p53 wurde in 70%, mit Ki67 in 57% und mit PCNA in 80% der Fälle festgestellt. Wir fanden in 38% der Fälle aneuploidale und in 62% diploidale DNA. Mit den ultrastrukturellen Untersuchungen ermittelten wir den individuellen Charakter des Plasmas und der Kerne. Alle aneuploidalen Tumoren zeigten eine starke Färbung der Zellkerne der p53- und Ki67-Gene. Bei der PCNA wurden keine Reaktionen beobachtet. Dabei wurde eine statistisch hoch signifikante Korrelation (p〈0,001) zwischen der Aneuploidie und dem T und N nachgewiesen. Man kann behaupten, daß der angewandte Komplex von Untersuchungstechniken des Krebsgewebes zu einer präziseren Einschätzung seiner biologischen Aktivität beitragen kann.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European archives of oto-rhino-laryngology and head & neck 254 (1997), S. S133 
    ISSN: 1434-4726
    Keywords: Laryngeal cancer ; p53 gene ; Cell DNA sequencing ; Mutation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The p53 gene is known as an anti-oncogene that manifests its function by controlling the cell cycle and is responsible for apoptosis of cells with unrepaired DNA. An accelerated p53 protein synthesis is the first response of a cell following DNA damage. However, mutations of the p53 gene can disturb protein synthesis or may be responsible for synthesis of a changed protein unable to control the cell cycle. Laryngeal tissue specimens from 120 patients were tested by immunohistopathological staining to detect mutated wild-type p53 protein. It was found that p53-positive specimens correlated with TNM staging and histopathological grading. Another indication of entering the cell cycle and undertaking an active proliferation by laryngeal cells was shown by detection of proliferating cell nuclear antigen (PCNA) and Ki67 nuclear antigen, which appeared in proliferating cells (late G1, S-G2 and M phase), but was absent in resting cells. Scoring of the staining for p53 protein, PCNA and Ki67 correlated with each other. DNA from 40 specimens was then isolated, amplified by polymerase chain reaction and analysed by single-strand conformation polymorphism and DNA sequencing for mutation in the p53 gene. Fifteen DNA samples were found to be positive, while mutations were detected in exons 5–8 in 13 samples. The majority of mutations were found in tissue specimens from T3 and T4 tumors. A possible explanation is almost half was attributable to genotoxic effects of tobacco smoking. Changes in the p53 gene and its products may also reflect early changes in laryngeal carcinogenesis and be of prognostic value.
    Type of Medium: Electronic Resource
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