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Stage groups for p16-positive oropharyngeal cancer (OPC) that are based on recursive partitioning analysis (RPA) with nasopharyngeal cancer regional lymph node categories. (A) Stage groups and 5-year overall survival (OS) estimates. Kaplan-Meier curves for overall survival (B) and progression-free survival (C) among patients with p16-positive OPC by using proposed stage groups that are based on RPA with nasopharyngeal cancer N categories.
