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The P value was obtained from comparison of four groups (log rank test). Patient with tumor thickness ≤ 4.0 mm and negative IMP-3 expression had the best overall (A), melanoma-specific (B), recurrence-free (C), and distant metastasis-free survival (D) (P<0.001, P<0.001, P<0.001, and P = 0.001, respectively).
