Peptide⁺/human leukocyte Ag⁺ CD8⁺ T cells and B-cell receptor–ABL levels. (A) FACS heat map of KQSSKALQR/human leukocyte Ag-A3 pentamer⁺ CD8⁺ T cells detectable in the peripheral blood of patient 9 at 3 weeks after the third infusion of the in vitro-generated CTL preparation. As demonstrated in panel B, this was accompanied by the detection of 1.5% ATGFKQSSK/human leukocyte Ag-A11/-A3 pentamer⁺ CD8⁺ T cells. The patient has remained in molecular remission throughout follow-up, with no signs of acute or chronic GVHD (C).