Figure 2From: Factors determining the survival of nasopharyngeal carcinoma with lung metastasis alone: does combined modality treatment benefit? Stratified analysis according to age, DFI and treatment modality. Overall survival (OS) and post-metastasis survival (PMS) curves stratified by treatment modalities in different disease-free intervals (DFI): DFI < 1 year (A and B), DFI = 1-3 years (C and D) and DFI > 3 years (E and F).Back to article page