Journal
BLOOD
Volume 104, Issue 8, Pages 2600-2602Publisher
AMER SOC HEMATOLOGY
DOI: 10.1182/blood-2003-12-4321
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The aim of this study was to investigate if graft-versus-leukemia (GVL) activity conferred by allogeneic stem cell transplantation (allo-SCT) is effective in chronic lymphocytic leukemia (CLL) with unmutated V-H gene status. The kinetics of residual disease (MRD) were measured by quantitative allele-specific immunoglobulin heavy chain (IgH) polymerase chain reaction (PCR) in 9 patients after nonmyeloablative allo-SCT for unmutated CLL. Despite an only modest decrease in the early posttransplantation phase, MRD became undetectable in 7 of 9 patients (78%) from day +100 onwards subsequent to chronic graft-versus-host disease or donor lymphocyte infusions. With a median follow-up of 25 months (range, 14-37 months), these 7 patients remain in continuous clinical and molecular remission. In contrast, PCR negativity was achieved in only 6 of 26 control patients (23%) after autologous SCT for unmutated CLL and it was not durable. Taken together, this study shows for the first time that GVL-mediated immunotherapy might be effective in CLL with unmutated V-H.
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