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Kaplan-Meier curves illustrating 5-year local recurrence-free survival (A) and 5-year metastasis-free survival according to grade (B). A, With respect to local recurrence-free survival, patients with grades 1, 2, and 3 tumors had a survival rate of 99.2%, 92.8%, and 91%, respectively (P = 0.058). B, With respect to metastasis-free survival, patients with grades 1, 2, and 3 tumors had a survival rate of 96.1%, 89.3%, and 78.5%, respectively (P < 0.001).
