Asian Pacific Journal of Cancer Prevention

  • 제16권7호
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  • Pages.2645-2651
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  • 2015
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  • 1513-7368(pISSN)
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  • 2476-762X(eISSN)
아시아태평양암예방학회 (Asian Pacific Journal of Cancer Prevention)
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Predictive and Prognostic Significance of p27, Akt, PTEN and PI3K Expression in HER2-Positive Metastatic Breast Cancer

  • Okutur, Kerem (Department of Medical Oncology, Acibadem University School of Medicine) ;
  • Bassulu, Nuray (Department of Pathology, Istanbul Bilim University School of Medicine) ;
  • Dalar, Levent (Department of Chest Disease, Istanbul Bilim University School of Medicine) ;
  • Aydin, Kubra (Ankara Oncology Training and Research Hospital) ;
  • Bozkurt, Mustafa (Department of Medical Oncology, Acibadem University School of Medicine) ;
  • Pilanci, Kezban Nur (Istanbul Bilim University School of Medicine) ;
  • Dogusoy, Gulen Bulbul (Department of Pathology, Istanbul Bilim University School of Medicine) ;
  • Tecimer, Coskun (Istanbul Bilim University School of Medicine) ;
  • Mandel, Nil Molinas (Department of Medical Oncology, Koc University School of Medicine) ;
  • Demir, Gokhan (Department of Medical Oncology, Acibadem University School of Medicine)
  • 발행 : 2015.04.14
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Background: The phosphatidylinositol 3'-kinase/Akt (PI3K/Akt) pathway is a key regulator for HER2-overexpressing breast cancer, but data about whether activation of PI3K/Akt is associated with poor prognosis and resistance to trastuzumab therapy is controversial. In this study we investigated predictive and prognostic significance of expression of p27, Akt, PTEN and PI3K, which are components of the PI3K/Akt signaling pathway, in HER2-positive metastatic breast cancer (MBC), retrospectively. Materials and Methods: Fifty-four HER2-positive MBC patients who had received first-line trastuzumab-based therapy were recruited for the study group. All of the patient's breast tissue samples were examined for p27 and Akt expression. In addition, twenty-five patients with sufficient amount of tumor tissue were also examined for PTEN and PI3K expression. p27, Akt, PTEN and PI3K were evaluated by immunohistochemistry and their relationship with patient demographic features, tumor characteristics, response to trastuzumab-based treatment and survival outcomes were analyzed. Results: p27, Akt, PTEN and PI3K were positive in 25.9%, 70.4%, 24% and 96% of the cases, respectively. Nomne were significantly associated with response to trastuzumab and time to progression (TTP). A trend toward statistical significance for longer overall survival (OS) was found for PTEN-positive patients (p=0.058); there was no significant relationship between the other immunohistochemical variables and OS. When we analyzed groups regarding co-expression, the PTEN-negative/Akt-negative group had a significantly lower objective response rate (ORR) (20% vs 80%, p=0.023) and the PTEN-negative/p27-negative and PTEN-negative/Akt-negative groups had significantly lower median OS compared to other patients (26.4 months vs 76.1 months, p=0.005 and 25.6 months vs 52.0 months, p=0.007, respectively). Conclusions: p27, Akt, PTEN and PI3K expression is not statistically significantly associated with ORR, TTP and OS, individually. However, the combined evaluation of p27, Akt and PTEN could be helpful to predict the response to trastuzumab-based therapy and prognosis in HER2-positive MBC.

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참고문헌

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