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Wild Type p73 Overexpression and High-Grade Malignancy in Breast Cancer

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Abstract

The overexpression of wild type p73 is the most frequent alteration of p73 in malignancies. We investigated, in 70 breast carcinomas, p73 mRNA expression and its relationship to p53 mutations, determined by an immunohistochemical method, and loss heterozygosity (LOH) status of the 1p36 region, together with its possible implication in the pathogenesis of breast carcinomas. LOH, amplifying DNA by PCR using 5 markers, of 1p36 region (one intragenic to p73 gene) was found in 17% of cases but no significant correlation was observed with p73 overexpression. p53 positive immunostaining was present in 33% of breast carcinomas, and these exhibited a statistically significant relation with p73 overexpressed tumors. Overexpression of p73 mRNA was observed in 19 tumors (27%). The analysis of cases with p73 overexpression and cases with normal mRNA expression, in terms of age and pathologic characteristics of the tumors showed a significant association of p73 overexpression and tumors with lymph node metastases, vascular invasion and higher pathologic stage. These results suggest that p73 overexpression is a molecular alteration that could be implicated in the tumorigenesis of breast carcinomas and, eventually, in a poor clinical behavior.

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Authors and Affiliations

  1. Departments of Medical Oncology, Clinica Puerta de Hierro, Spain

    Gemma Dominguez, Jose M. Silva, Javier Silva, Jose M. Garcia, Antonio Sanchez, Mariano Provencio, Pilar España & Felix Bonilla

  2. Departments of Medical Pathology, Clinica Puerta de Hierro, Spain

    Antonia Navarro

  3. Department of Pathology, Hospital Santa Cristina, Madrid, Spain

    Isabel Gallego

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  1. Gemma Dominguez
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  2. Jose M. Silva
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Dominguez, G., Silva, J.M., Silva, J. et al. Wild Type p73 Overexpression and High-Grade Malignancy in Breast Cancer. Breast Cancer Res Treat 66, 183–190 (2001). https://doi.org/10.1023/A:1010624717311

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