Fig. 2From: Identifying optimal candidates for local treatment of the primary tumor among patients with de novo metastatic nasopharyngeal carcinoma: a retrospective cohort study based on Epstein–Barr virus DNA level and tumor response to palliative chemotherapyKaplan–Meier OS curves in 502 patients with de novo metastatic NPC (a) Patients grouped according to EBV DNA level after PCT. b Patients grouped according to tumor response after PCT. c Patients grouped according to risk stratificationBack to article page