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  • 1
    ISSN: 1569-8041
    Schlagwort(e): breast cancer ; p53 ; prognostic factors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Background:There is heterogeneity of methods and conflictingresults concerning the prognostic value of p53 in node-negativebreast cancer. The clinical value of a quantitative method for measuringtumoral p53 content still needs to be evaluated. Patients and methods: A long-term retrospective study wasconducted on 297 node-negative patients with a median follow-up greater than10 years (11 years, 101–172 months). Classic prognostic factors wereconsidered including age, tumor size, histoprognostic grade and estradiol (ER)and progesterone receptors (PR). In addition, the value of p53 determination (immunoluminometric assay in tumor cytosol) was assessed forthis long follow-up period. Results: p53 concentrations were significantly linked tothe histological grade (P = 0.001), to tumor size (P = 0.02)and ER status (P = 0.01). Higher p53 tumoral concentrationswere found in tumors with large size, pejorative histological grade andnegative ER status. In contrast, p53 tumoral concentrations were notinfluenced by menopausal or PR status. Multivariate Cox analysis demonstratesthat tumor size was the only significant predictor of disease-free survival(P = 0.049) with a risk factor at 1.38. As regards specific survival,univariate Cox analysis indicates that p53 taken as a continuousvariable is a significant predictor (P = 0.024) together withhistological grade, tumor size and ER status. In a multivariate Cox analysisthere were two significant and independent variables for predicting overallsurvival: tumor size (P = 0.031) and ER status (P = 0.015)with the highest risk factor (RR = 2.14). Conclusions:The present investigation points out that theprognostic power of p53 tumor determination evaluated at more than10 years median survival is not higher than the well-recognized classicprognostic factors in node-negative breast cancer. The present data highlightthe need to assess the prognostic value of potentially new biological factorsin node-negative breast cancer on cohorts of patients followed over periodsin excess of 10 years.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Journal of cancer research and clinical oncology 100 (1981), S. 41-50 
    ISSN: 1432-1335
    Schlagwort(e): Thyroid ; Hepatocarcinogenesis ; Fluorenylacetamide ; Schilddrüse ; Leberkarzinogenese ; N-fluoren-2-acetamid
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zsammenfassung Während der chemischen Leberkarzinogenese, hervorgerufen durch N-fluoren-2-acetamid, ist der Hormonhaushalt der weiblichen Sprague Dawley Ratten weitgehend verändert. Die Schilddrüse weist eine Aktivitätsveränderung auf, die durch die histologische Untersuchung sowie die T3-und T4-Analyse sichtbar wird. In der Hypophyse sind die thyreotropen Zellen in einem hyperaktivem Zustand, eine Tatsache, die mit der Beobachtung übereinstimmt, daß die Größe der Schilddrüsenfollikel und der epithelialen Zellen verändert ist, was eine Hyperaktivität der Schilddrüse beweist. Trotz der histologischen Veränderungen ist der T4-Spiegel im Serum erniedrigt. Auch der T3-Spiegel ist niedriger, jedoch nur geringfügig. Wir schließen daraus, daß die Erniedrigung des Spiegels der Schilddrüsenhormone eine Rolle beim relativen Schutz der weiblichen Ratten (im Gegensatz zu den männlichen) gegen Leberkrebs spielt, der durch Chemikalien hervorgerufen wurde.
    Notizen: Summary During chemical carcinogenesis by N-2-fluorenylacetamide, the hormonal status of female Sprague Dawley rats is largely modified. Thyroids present a modified activity which is evidenced by the histological study as well as T4 and T3 assays. In hypophysis, thyrotropic cells were found in an hyperactive state, a fact which is in agreement with the changes observed in thyroid follicles size and epithelial cells demonstrating an hyperactivity of thyroid glands. Despite this histological result, T4 serum level was lowered. T3 level was also decreased but to a lesser extent. We suggest that the low thyroid hormone level play a role in the relative protection of females versus males toward liver cancer induction by chemicals.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 1573-7217
    Schlagwort(e): breast carcinoma ; EGF receptor assay ; estrogen receptor ; prognostic factors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Epidermal growth factor (EGF) is a 6000 kDa peptide which exerts its biological effects by binding to a specific cell membrane receptor (EGF-R). Extensive studies on EGF-R in breast tumors have demonstrated the prognostic value of such assays. EGF-R measurement is also reportedly potentially useful in other tumors. Classically, the EGF-R content of tumor cell membrane preparations is evaluated by competition between a given concentration of labeled ligand and various concentrations of unlabeled ligand. The large quantity of tumor tissue required (approx. 0.5 g) is a serious limitation for wide-spread use of EGF-R assays. In order to validate a miniaturized EGF-R assay method, the principle of a single-dose technique (SD) using a single concentration of labeled ligand (1 nM) was investigated in the present work. Only 100–150 mg wet tissue were required for routine analysis by the SD method. The correlation between the SD method and Scatchard analysis calculated from 41 different breast carcinoma samples was very satisfactory (r = 0.973, p 〈 0.001). Analysis of intra-assay and inter-assay reproducibility revealed a comparable EGF-R status in given samples. The correlation between EGF-R levels and steroid receptors was investigated in 105 individual breast tumors. EGF-R levels were inversely correlated with the estradiol receptor values. No correlation was found with progesterone receptors. The simplified SD method for EGF-R measurement appears suitable for large scale clinical studies aimed at investigating the potential utility of this biological tumor marker.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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