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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2017.12
- 수록면
- 57 - 63 (7page)
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Purpose: The 40S ribosomal protein S6 kinase-1 (S6K1) is a crucial downstream effector of the PI3K/AKT/mTOR pathway. S6K1 overexpression is found in 10% to 30% of breast cancers and is associated with aggressive disease and poor prognosis. Herein, we investigated the relationship between the expression of phosphorylated S6K1 (p-S6K1) and efficacy of lapatinib in patients with human epidermal growth factor receptor 2 (HER2)-positive metastatic breast cancer. Methods: We retrospectively analyzed the data of 36 patients with HER2-positive metastatic breast cancer treated with lapatinib between January 2010 and September 2014. The p-S6K1 expression status of the primary tumor was assessed via immunohistochemistry using a mouse monoclonal antibody. Results: Fourteen of the 36 patients (38.9%) had p-S6K1-positive tumors. The median progression-free survival (PFS) of patients with p-S6K1-positive tumors was significantly longer than that of patients with p-S6K1-negative tumors (13.4 months vs. 7.1 months, p=0.025). In multivariate analysis, p-S6K1 positivity remained an independent, favorable predictive factor for PFS (hazard ratio, 0.32; 95% confidence interval, 0.11?0.97; p=0.044). Conclusion: The high expression of p-S6K1 was significantly associated with prolonged PFS, suggesting that p-S6K1 can be a potential biomarker for predicting the efficacy of lapatinib in patients with HER2-positive metastatic breast cancer.
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