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Kaplan-Meier survival curves of overall survival (OS) (A), progression-free survival (PFS) (B), locoregional relapsefree survival (LRFS) (C), and distant metastasis-free survival (DMFS) (D) for comparing 164 patients with parotid lymph nodes (PLN) involvement and 6,920 patients without PLN involvement classified by N classification.
