Abstract
Although donor lymphocyte infusion (DLI) induces complete remissions in 70% of patients with relapsed chronic myeloid leukemia (CML) after allogeneic stem-cell transplantation (SCT), some patients are refractory to DLI by showing disease persistence. In a patient who received DLI for relapsed CML, we observed persisting molecular disease despite a hematological and cytogenetic remission in the absence of graft-versus-host disease (GVHD). To determine the nature of this immune response, we isolated leukemia-reactive donor T-cell clones from the bone marrow (BM) of the patient at the time of clinical response. Four different types of CD8+ HLA class I restricted T-cell clones were obtained that were cytotoxic against Ebstein-Barr virus-transformed B-cell lines (EBV-LCL) of the patient, but not the donor, indicating recognition of minor histocompatibility antigens (mHags). By using survival studies with CFSE labelled BM cells populations, a hematopoietic progenitor cell inhibition assay and direct morphological examination we showed that the T-cell clones recognized mature monocytic and myeloid cells, whereas immature BM progenitor cells were insufficiently lysed. This patient's refractoriness for DLI appears to be caused by inadeq...Continue Reading
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