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Defining the optimal cut-off points of age and tumor size via the X-tile program (A–F). The black dot represents the optimal cut-off points of age and tumor size (A, D). The histogram (B, E) and survival curves (C, F) were demonstrated based on cut-off points. Optimal cut-off points of age and tumor size were 51 years and 58 years and 70 mm and 140 mm, respectively.
