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Risk score cut-off values of nomogram and Kaplan-Meier curve. (a) X-tile plots used to generate optimal cut-off values of risk score of the nomogram and divide IM-HCC into three groups (low risk: risk score ≤ 121; middle risk: 121 < risk score ≤ 148; high risk: risk score > 148); (b) Kaplan-Meier curve for different group.
