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(A-F) The graphs show defining the optimal cutoff values of age and tumor size via X-tile analysis. (A, D) The black dot indicates that optimal cutoff values of age and tumor size have been identified. (B, E) A histogram and (C, F) Kaplan–Meier were constructed based on the identified cutoff values. Optimal cutoff values of age and tumor size were identified as 13 years and 28 years, 71 mm and 115 mm based on survival, respectively.
