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  • 1
    ISSN: 1432-2307
    Keywords: Oncogene ; Breast neoplasm ; Image analysis ; DNA content ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The expression of the c-erbB-2 proto-oncogene product was investigated immunohistochemically in 474 formalin-fixed and paraffin-embedded human breast tissue samples. The series included 32 benign and 26 hyperplastic lesions, 32 carcinomas in situ and 384 invasive breast carcinomas, 107 of which were less than 1 cm in diameter. Cytometric DNA assessments were performed on histopathologically or cytodiagnostically identified cell nuclei, using image analysis. C-erbB-2 immunoreactivity was not seen in normal parenchyma or in benign and hyperplastic lesions. Mammary carcinomas in situ were more frequently immunoreactive (59%) than invasive neoplasms (23%). Invasive tumours more than 1 cm in diameter immunoreacted more often (26%) than small invasive carcinomas (16%). C-erbB-2 expression in regional lymph node metastases was the same as in the corresponding primary tumours. Significant differences were observed between the c-erbB-2 expression in DNA diploid and aneuploid lesions; for carcinomas in situ the figures were 40% and 72%, respectively. Invasive carcinomas of DNA diploid type rarely showed c-erb-B-2 expression, irrespective of tumour size and nodal status (7–11%). DNA aneuploid tumours were more frequently immunoreactive with increasing levels during progression (32–41%). Our data indicate that genetically stable invasive mammary tumours seem rarely to express the c-erbB-2 protein, even during progression, whereas genetically unstable invasive neoplasms frequently show c-erbB-2 immunoreactivity which increases during tumour progression.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The expression of theS-phase associated, nuclear protein proliferating cell nuclear antigen (PCNA) was investigated in routinely paraffin-embedded surgical specimens from 209 breast cancer patients. Cytometric DNA assessments were performed on fine-needle aspirates, upon which the primary diagnosis of breast cancer had been based. The mean clinical follow-up was 16 years (range 13–20 years). The percentage of PCNA immunoreactive tumour cells ranged between less than 5 to 60% (mean value 13.34%). There was a direct association between PCNA expression, high histological tumour grade (p〈0.01), and DNA aneuploidy (p=0.009). In a subgroup of 22 patients with near-diploid DNA distribution patterns the PCNA expression yielded additional prognostic information. Patients with tumours of near-diploid DNA histograms and more than 20% of PCNA immunoreactive neoplastic cells had a significantly worse clinical course, than patients with neardiploid tumours containing less than 20% PCNA immunoreactive cells (p=0.0001). In contrast, the PCNA immunoreactivity did not yield additional prognostic information for patients with distinctly diploid or highly aneuploid tumour variants. In a multivariate analysis comprising all 209 patients, nodal status (p〈0.01), tumour size (p〈0.01), and DNA ploidy (p〈0.01) were found to have significant prognostic effect. The findings indicate that carcinomas characterised by high proliferative activity and near-diploid DNA distribution patterns can show rapid tumour progression. The combined assessment of the PCNA immunoreactivity and of the nuclear DNA content in routinely processed surgical specimens of breast cancer patients appears to be of prognostic value.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2323
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé En plus des caractéristiques tumorales histopathologiques classiques, y compris le contenu en ADN, la cinétique cellulaire et l'étude de l'expression de gènes suppresseurs sont peut-être importantes dans le bilan d'un cancer du sein. Nous avons examiné par des coupes en paraffine la surexpression immunohistologique de la protéine associée avec l'interphase (le proliferating cell nuclear antigen: PCNA) et la mutante p 53 chez 180 femmes atteintes de cancer de sein ayant des caractéristiques d'ADN connus. Le pourcentage de PCNA immunoréactif variait entre 〈5 à 60% (moyenne: 13.59±10.85). Il y avait une corrélation positive entre les niveaux d'expression du PCNA (〉20%) et la surexpression p 53 (p=0.001), le grade histologique élevé (p=0.009), et l'aneuploïdie d'ADN (p=0.019). La mutante p 53 a été retrouvée chez 44 des 180 (24%) femmes et était significativement associée à un grade tumoral élevé (p= 0.004), à l'aneuploïdie (p=0.001) et à des taux élevés d'expression de PCNA (p=0.001). Les patientes ayant un cancer agressif (〉20% d'expression de PCNA) avaient une survie sans métastases plus courte lorsque leur tumeur surexprimait la mutante p53. En revanche, la survie des patientes sans métastase à distance ayant une surexpression de p 53 négative était significativement plus longue (p=0.03). La surexpression p 53 semble correspondre à un potentiel malin élevé chez les femmes ayant un cancer du sein. Les tumeurs hautement prolifératives ayant des cellules à expression p 53 sont cliniquement plus agressives que celles qui ne l'ont pas.
    Abstract: Resumen Existe evidencia creciente que indica que, además de las características histopatológicas convencionales, incluyendo la determinación de contenido de DNA, los datos de cinética celular y la investigación de la expresión del gen supresor de tumores podrian suministrar información valiosa en pacientes con cáncer mamario. En consecuencia, hemos investigado por métodos inmunohistoquímicos la sobreexpresión de la proteína PCNA (proliferating cell nuclear antigen) asociada con la interfaz y de la proteina mutante p53 en especímenes quirúrgicos fijados rutinariamente en parafina provenientes de 180 pacientes con cáncer mamario con perfiles conocidos de DNA nuclear. El periodo promedio de seguimiento clínico fue 16 años (13–20 años). El porcentaje de núcleos de células tumorales inmunoreactivos a PCNA osciló entre 〈5% a 60% (valor medio 13.59±10.85). Se encontró una relación directa entre los altos niveles de expresión de PCNA (〉 20%) y sobreexpresión de proteína p53 (P=0.001), un alto grado histológico en el tumor (P=0.009) y aneuploidia de DNA (P=0.019). Se encontró sobreexpresión de proteína p53 en 44 de 180 (24%) casos y con relación significativa con el alto grado histológico tumoral (P=0.004), aneuplodia de DNA (P=0.001) y altos niveles de expresión de PCNA (P=0.001). Las pacientes con carcinomas muy proliferativos (expresión de PCNA〉20%) exhibieron una más corta sobrevida libre de metástasis a distancia cuando su tumor presentó sobreexpresión de p53. En contraste, la sobrevida libre de metástasis distantes en pacientes con tumores altamente proliferativos y p53 negativos apareció significativamente prolongada (P=0.03). Por consiguiente, la sobreexpresión de proteína p53 parece ser un indicador de un incrementado potencial de malignidad en pacientes con cáncer mamario. Los tumores altamente proliferativos, compuestos de céluls neoclásicas inmunoreactivas a p53 parecen tener un comportamiento clínico más agresivo en comparación con los tumores altamente proliferativos pero p53 negativos.
    Notes: Abstract An increasing body of evidence suggests that in addition to conventional histopathologic tumor characteristics, DNA content measurements, cell kinetic data, and investigatios of tumor suppressor gene expressions might be of valuable information in breast cancer patients. Against this background we investigated immunohistochemically overexpression of the interphase associated protein proliferating cell nuclear antigen (PCNA) and the mutant p53 protein in routinely paraffin-embedded surgical specimens from 180 breast cancer patients with known nuclear DNA profiles. The mean clinical follow-up was 16 years (range 13–20 years). The percentage of PCNA immunoreactive tumor cell nuclei ranged between 〈5% and 60% (mean 13.59±10.85%). There was a direct association between high levels of PCNA expression (〉20%) and p53 protein overexpression (p=0.019). Mutant p53 protein overexpression was found in 44 of 180 (24%) cases and was significantly related to high histologic tumor grade (p=0.004), DNA aneuploidy (p=0.001), and high levels of PCNA expression (p=0.001). Patients with highly proliferative carcinomas (〉20% PCNA expression) had a shortened distant metastases-free survival when their neoplasms overexpressed p53. In contrast, the distant metastases-free survival of patients with highly proliferative, p53-negative tumors was significantly longer (p=0.03). Immunohistochemical p53 protein overexpression thus appears to be indicative of an increased malignant potential in breast cancer patients. Highly proliferative tumors composed of p53 immunoreactive neoplastic cells clinically seem to behave more aggressively than the highly proliferative p53-negative tumors.
    Type of Medium: Electronic Resource
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