Relationship between WT1-specific CD8⁺ T-cell responses and WT1 gene expression in peripheral blood of patients with ALL and donors. (A) WT1 gene expression in peripheral blood samples from healthy donors, patients with ALL before SCT and after SCT. (B) Correlation between WT1 and BCR-ABL expression in PB samples from patient 2. (C) Relationship between WT1-specific CD8⁺ T-cell frequencies in PB samples after SCT and WT1 gene expression in PB samples obtained before SCT. Bars represent medians.