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Kaplan-Meier analysis of 4-HNE expression level in esophageal squamous cell carcinoma patient samples. By performing the Kaplan-Meier test, the present study revealed a significant association between overall survival and the expression level of 4-HNE (P=0.029), when the two groups were defined as positive and negative. 4-HNE, 4-hydroxynonenal.
