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Kaplan‐Meier curves of the combination of risk groups at pretreatment and end of radiotherapy for distant metastasis‐free survival (DMFS) and overall survival (OS) in nasopharyngeal carcinoma patients. A, DMFS of pretreatment low‐risk group. B, OS of pretreatment low‐risk group. C, DMFS of pretreatment high‐risk group. D, OS of pretreatment high‐risk group
