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Kaplan–Meier curves pertaining to the overall survival in patients with recurrent nasopharyngeal carcinoma: (A) age (≥50 vs. <50 years); (B) body mass index (BMI); (C) rT stage (rT3 vs. rT4); (D) tumor necrosis; (E) tumor invasion into the ICA; (F) the use of pedicled flap; and (G) surgical margins.
