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Esophageal carcinoma is a challenging target for radiotherapy. To improve treatment efficacy, an investigation of a predictive factor is desirable. In this study, we evaluated the significance of apoptosis and immunohistochemical staining for p53, Ki-67, c-erbB-2 (HER-2/neu), Ku (p70/p80), and DNA-PKcs for predictive markers of the responsiveness to chemoradiotherapy in esophageal squamous cell carcinoma.
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