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Overall survival of patients with higher and lower proportions and numbers (<0.4% and <2.5 × 106 cells/L, or the discriminative values for proportions and numbers, respectively) of CD4+CD25high lymphocytes (lower panel) based on the cut-off point analysis (upper panel). The optimal cut-off point selected was the point with the maximum log-rank statistic close to a 50/50 split of patients.
