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Higher preoperative serum LDH level predicted poor survival in HCC patients. The significance of preoperative serum LDH level in predicting OS (A, C, and E) and DFS (B, D, and F) in HCC patients enrolled in the training set (A and B), in the validation set (C and D), and in the total test set (E and F) was estimated by the Kaplan-Meier method and compared by the log-rank test.
