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Kaplan–Meier survival curves for s‐OSCC and p‐OSCC patients in the propensity‐matched cohort. (A) Overall survival; (B) disease‐specific survival; (C) local recurrence‐free survival; (D) regional metastasis‐free survival. Survival curves are compared by the log‐rank test, and P < 0.05 is considered as statistically significant. OSCC, oral squamous cell carcinoma; p‐OSCC, primary OSCC; s‐OSCC, second primary OSCC after radiotherapy for nasopharyngeal carcinoma.
