MPO and leukemia: We have previously identified a leukemia-associated HLA-B0702-restricted epitope derived from MPO (MPO466−474 named MPO5) by mass spectrometry (MS) as well as the TCR2.5D6 derived from the sHLAm T-cell repertoire with high peptide specificity and leukemic reactivity suitable for clinical application in the context of allogeneic stem cell transplantation (27).