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Five-year overall survival (A) and disease-free survival (B) in the high- and low-risk groups. a)High-risk group was defined as patients with disease-free interval (DFI) < 12 months, or multiple pulmonary metastases, or mediastinal lymph node (LN) involvement, b)Low-risk group was defined as patients with DFI ≥ 12 months, solitary lesions, and absence of mediastinal LN involvement.
