Fig. 3From: Prognostic significance of cervical radiologic carotid artery invasion by lymph node on magnetic resonance imaging in nasopharyngeal carcinomaOverall (A, a), disease-free (B, b) and distant failure-free (C, c) survival for each N category as defined by the 8th edition of the AJCC N staging system (A-C) and the proposed N staging system (a-c)Back to article page