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Journal of Translational Medicine
Published in: Journal of Translational Medicine 1/2011

Open Access 01-12-2011 | Research

The prognostic impact of Akt isoforms, PI3K and PTEN related to female steroid hormone receptors in soft tissue sarcomas

Authors: Andrej Valkov, Thomas K Kilvaer, Sveinung W Sorbye, Tom Donnem, Eivind Smeland, Roy M Bremnes, Lill-Tove Busund

Published in: Journal of Translational Medicine | Issue 1/2011

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Abstract

Background

The PI3K/Akt pathway is involved in cellular survival pathways by inhibiting apoptotic processes and stimulating cell growth and proliferation. Its negative prognostic value has been proven in many types of cancer. In soft tissue sarcomas, the expression profiles of the PI3K/Akt pathway components are poorly defined and their significance uncertain. We aimed to investigate the prognostic impact of Akt (Akt1) phosphorylated at threonine308 and serine473, Akt2, Akt3, PI3K and PTEN, alone and in coexpression with ER and PgR in non-gastrointestinal stromal tumor soft tissue sarcomas (non-GIST STSs).

Patients and methods

Tumor samples and clinical data from 249 patients with non-GIST STS were obtained, and tissue microarrays (TMAs) were constructed. Immunohistochemistry (IHC) was used to evaluate marker expression in tumor cells.

Results

In univariate analyses, the expression levels of p-Akt Thr308 (P = 0.002), Akt2 (P = 0.008) and PI3K (P < 0.001) were significant prognostic factors. In the multivariate analysis, high PI3K expression was an independent negative prognosticator (HR = 1.5, 95% CI = 1.0-2.2, P = 0.042) in addition to advanced age, tumor depth, high malignancy grade, metastasis at diagnosis, surgery and positive resection margins. p-Akt Thr308 expression had strong unfavorable effect in men only (P = 0.009). In contrast, p-Akt Ser473 expression had strong unfavorable impact in women (P = 0.023). PgR-/p-Akt Ser473+ phenotype tended to have less favorable impact in women (P = 0.087), but was the most favorable one in men (P = 0.010).

Conclusion

Expression of PI3K was significantly associated with aggressive behavior and shorter DSS in non-GIST STSs. The site of Akt phosphorylation seems to have gender-dependent impact on survival in STS patients.
Appendix
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Metadata
Title
The prognostic impact of Akt isoforms, PI3K and PTEN related to female steroid hormone receptors in soft tissue sarcomas
Authors
Andrej Valkov
Thomas K Kilvaer
Sveinung W Sorbye
Tom Donnem
Eivind Smeland
Roy M Bremnes
Lill-Tove Busund
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Journal of Translational Medicine / Issue 1/2011
Electronic ISSN: 1479-5876
DOI
https://doi.org/10.1186/1479-5876-9-200

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