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• W2082568558 abstract "The status of p53 and the phosphatidylinositol 3-kinase–AKT (PI3K–AKT) signaling pathway was investigated in 132 endometrial carcinomas, including endometrioid endometrial carcinomas, non-endometrioid endometrial carcinomas, and mixed endometrioid adenocarcinomas-non-endometrioid adenocarcinomas. Results were compared with the clinicopathologic parameters associated with prognosis, patients’ follow-up, and other genetic alterations found frequently in these tumors. Molecular genetic differences between low-grade and high-grade endometrioid adenocarcinomas were encountered; ie, PIK3CA mutations were detected in 26 and 34% of cases, respectively. We found p53 alterations in only 17% of high-grade endometrioid adenocarcinomas. In contrast, non-endometrioid adenocarcinomas had a higher frequency of p53 alterations (54%), PIK3CA mRNA overexpression (45%), and exon 20 PIK3CA mutations (21%). In the mixed endometrioid adenocarcinomas-non-endometrioid adenocarcinomas, the most frequent alterations were p53 (50%) and PIK3CA (44%) mutations, followed by PTEN mutations (38%). In some cases, p53 and PIK3CA alterations coexisted, but they rarely coexisted with the PTEN mutations. Our findings suggest that the PIK3CA mutations are frequent events in endometrial carcinomas of any histological type. However, location of the PIK3CA mutations, either in exon 9 or exon 20, varies significantly according to the histologic grade and type of carcinoma. Carcinomas with exon 20 PIK3CA mutations or PIK3CA mRNA overexpression were often high-grade carcinomas associated with myometrial invasion; in contrast, tumors that carried exon 9 mutations were more likely to be low-grade carcinomas. The Kaplan–Meier analysis suggested that p53 alterations (strong immunoexpression or mutations) conferred a worse prognosis (P=0.000). Although alterations in the PI3K–AKT signaling pathway alone did not influence overall survival, patients with deregulated PI3K–AKT pathway (PIK3CA and/or PTEN alterations) and p53 alterations had shorter survival (P=0.000) than patients with only p53 alterations. Such a relationship was lost when we considered exon 9 PIK3CA mutations. Our results contribute to further characterize the molecular genetic model for endometrial carcinogenesis." @default.
• W2082568558 created "2016-06-24" @default.
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• W2082568558 date "2009-04-01" @default.
• W2082568558 modified "2023-10-06" @default.
• W2082568558 title "Concomitant PI3K–AKT and p53 alterations in endometrial carcinomas are associated with poor prognosis" @default.
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• W2082568558 doi "https://doi.org/10.1038/modpathol.2009.5" @default.
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