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Kaplan-Meier overall survival (A), progression-free survival (B), locoregional relapse-free survival (C), and distant metastasis-free survival (D) curves for the 664 patients with nasopharyngeal carcinoma divided into the residual tumor group and non-residual tumor group. All categories are based on the 7th edition of the Union for International Cancer Control/American Joint Committee on Cancer staging system.
