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The 1‐year (A) progression‐free survival (PFS), (B) local recurrence‐free survival (LRFS), (C) regional recurrence‐free survival (RRFS), and (D) distant metastasis‐free survival (DMFS) rates of patients with locoregionally recurrent nasopharyngeal carcinoma treated with intensity‐modulated carbon ion radiotherapy.
