Abnormalities in the NF-κB family and related proteins in endometrial carcinoma

Authors

  • Judit Pallares,

    1. Department of Pathology and Molecular Genetics, Hospital Universitari Arnau de Vilanova, Departament de Ciències Mèdiques Bàsiques, University of Lleida, Lleida, Spain
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  • Jose Luis Martínez-Guitarte,

    1. Department of Pathology and Molecular Genetics, Hospital Universitari Arnau de Vilanova, Departament de Ciències Mèdiques Bàsiques, University of Lleida, Lleida, Spain
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  • Xavier Dolcet,

    1. Department of Pathology and Molecular Genetics, Hospital Universitari Arnau de Vilanova, Departament de Ciències Mèdiques Bàsiques, University of Lleida, Lleida, Spain
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  • David Llobet,

    1. Department of Pathology and Molecular Genetics, Hospital Universitari Arnau de Vilanova, Departament de Ciències Mèdiques Bàsiques, University of Lleida, Lleida, Spain
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  • Montserrat Rue,

    1. Department of Pathology and Molecular Genetics, Hospital Universitari Arnau de Vilanova, Departament de Ciències Mèdiques Bàsiques, University of Lleida, Lleida, Spain
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  • José Palacios,

    1. Laboratory of Breast and Gynaecological Cancer, Centro Nacional de Investigaciones Oncologicas, Madrid, Spain
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  • Jaime Prat,

    1. Department of Pathology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain
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  • Xavier Matias-Guiu

    Corresponding author
    1. Department of Pathology and Molecular Genetics, Hospital Universitari Arnau de Vilanova, Departament de Ciències Mèdiques Bàsiques, University of Lleida, Lleida, Spain
    • Department of Pathology and Molecular Genetics, Hospital Universitari Arnau de Vilanova, Av Alcalde Rovira Roure 80, 25198 Lleida, Spain.
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Abstract

The NF-κB family of transcription factors regulates a wide variety of cellular processes including cell growth, differentiation, and apoptosis. A tissue microarray was constructed from paraffin wax-embedded blocks from 95 endometrial carcinomas (EC), previously studied for microsatellite instability, as well as for alterations in PTEN, k-RAS and beta-catenin. Immunohistochemical evaluation included members of the NF-κB (p50, p65, p52, c-Rel, Rel-B) and the IκB (IκBα, IκBβ, IκBε, Bcl-3) families, as well as putative targets of NF-κB such as Flip, Bcl-xL, Cyclin D1, and oestrogen and progesterone receptors. Results were correlated with the clinical and pathological data. Nuclear immunostaining for members of the NF-κB family was frequent in EC (p50, 20%; p65, 16.5–21.9%; p52, 9.3%; c-Rel, 48.9%; Rel-B, 15.7%); and it correlated with negativity for members of the IκB family in some cases. There was a statistically significant association between immunoreaction for p50 and p65 (p = 0.006), suggesting activation of the so-called ‘classic form’ of NF-κB, similar to that described in breast cancer. Bcl-3 nuclear immunostaining was detected in 60.7% of cases. The vast majority of p52-positive tumours showed Bcl-3 nuclear immunoreaction (p = 0.038). Immunostaining for putative targets of NF-κB was as follows: Bcl-xL, 76.2% (p = 0.001); Flip 43.0%; Cyclin D1, 64.79%. p65 immunostaining correlated with increased immunoreaction for steroid hormone receptors. No correlation was found between NF-κB nuclear pattern and the presence of microsatellite instability, or alterations in PTEN, k-RAS, or beta-catenin. These results suggest that the NF-κB and IκB families of genes may be important in endometrial carcinogenesis, by controlling apoptosis and cell proliferation. Copyright © 2004 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.

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