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Kaplan-Meier curves. A: Overall survival, P-value by log-rank test < 0.001; B: Disease free survival in patients with elevated serum carbohydrate antigen 19-9 (CA 19-9) levels (n = 163) and those with normal serum CA 19-9 levels (n = 325), P-value by log-rank test = 0.099.
