Fig. 3From: A curative-intent endoscopic surgery for postradiation nasopharyngeal necrosis in patients with nasopharyngeal carcinomaKaplan–Meier curves illustrating the overall survival (OS) of a all patients, b patients stratified by their postoperative pathological result, and c patients stratified by the status of the flap. (+) positive, (−) negative, Path pathologyBack to article page