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. 2019 Jan 21;19:92. doi: 10.1186/s12885-019-5281-5

Fig. 2.

Fig. 2

Kaplan–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 stratification