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Optimal cutoff values for patient’s age (A, B), tumor size (C, D), and year of diagnosis (E, F) through X-tile software analysis. The optimal age cut-off values determined by overall survival were 38, 47, and 58 years. The optimal tumor size cutoff values determined by overall survival were 28 mm and 69 mm. The optimal year of diagnosis cutoff values determined by overall survival were 1996 and 2004.
