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p53 Expression is Decreased in Primary Breast Carcinomas with Microsatellite Instability
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p53 Expression is Decreased in Primary Breast Carcinomas with Microsatellite Instability
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Journal Article
p53 Expression is Decreased in Primary Breast Carcinomas with Microsatellite Instability
2002
Overview
p53 and p185 expression in primary breast cancer with microsatellite instability (MSI) is still largely unexplored. To investigate the relationship between these oncoproteins and the pathways of genomic instability, we examined 52 primary invasive breast cancers stratified by the presence and absence of MSI. We determined the status of eight microsatellite loci using radioactive and silver staining methods, and evaluated the immunohistochemical expression of p53 and p185 in a consecutive series of Italian cancer patients characterized by clinical-pathological and biological parameters. Nineteen cases (36.5%) were MSI-positive in at least two loci. p53 was expressed in 15 cases (28.8%) and p185 in eight (15.4%). MSI-positive tumors were inversely correlated with p53 expression (p = 0.0007); in addition, the percent of p53-expressing cells decreased as the number of MSI-positive loci increased. MSI-positive tumors were correlated with a larger tumor size (p = 0.04), lymph-node metastasis (p = 0.001), and advanced clinical stage (p = 0.0006). These data demonstrate the existence of two subsets of primary breast cancers: one characterized by MSI, the other by p53 expression. MSI-positive patients had a more advanced and/or aggressive disease.
Publisher
Springer,Springer Nature B.V
Subject
/ Aged
/ Biological and medical sciences
/ Breast Neoplasms - pathology
/ Female
/ Gene Expression Regulation, Neoplastic
/ Gynecology. Andrology. Obstetrics
/ Humans
/ Microsatellite Repeats - genetics
/ Receptor, ErbB-2 - biosynthesis
/ Tumor Suppressor Protein p53 - biosynthesis
/ Tumor Suppressor Protein p53 - genetics
/ Tumors
