Significance of Nuclear Accumulation of Foxo3a in Esophageal Squamous Cell Carcinoma

Miao Fen Chen, Fu Min Fang, Chang Hsien Lu, Ming Shian Lu, Wen Cheng Chen, Kuan Der Lee, Paul Yang Lin

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Purpose: To investigate the value of Foxo3a in predicting the response to neoadjuvant treatment of, and prognosis for, esophageal squamous cell carcinoma. Methods and Materials: Immunohistochemical staining was performed in a retrospective series of 60 biopsied esophageal squamous cell carcinomas, and the correlation between nuclear accumulation of Foxo3a and clinicopathologic features was analyzed, including patient survival. In addition, in vitro biologic changes, radiosensitivity, and in vivo tumorigenicity of esophageal carcinoma cells after experimental manipulation of Foxo3a expression levels were determined. Results: Clinical findings point to a significant correlation between the nuclear accumulation of Foxo3a and the survival rate of esophageal cancer patients. In addition, Foxo3a is a significant predictor for the response to neoadjuvant therapy. In cell culture, irradiation and oxidative stress seemed to result in nuclear accumulation of Foxo3a. Down-regulation of Foxo3a significantly decreased radiosensitivity but had no obvious effect on tumor growth, as measured by a clonogenic assay in vitro and growth delay in vivo. Conclusions: Nuclear accumulation of Foxo3a in tumor cells was correlated with increased radiosensitivity and with improved patient survival. Thus, it is suggested that Foxo3a may be a potential marker for esophageal cancer.

Original languageEnglish
Pages (from-to)1220-1229
Number of pages10
JournalInternational Journal of Radiation Oncology Biology Physics
Volume71
Issue number4
DOIs
Publication statusPublished - Jul 15 2008
Externally publishedYes

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Keywords

  • Esophageal cancer
  • Foxo3a
  • Radiation

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Radiation

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