Abstract
This study investigated the efficacy of minimal residual disease (MRD) monitoring and MRD-directed preemptive immunotherapy in high-risk myelodysplastic syndrome (MDS) patients who received allogeneic hematopoietic stem cell transplantation (HSCT). MRD assessment consisted of Wilms’ tumor gene 1 (WT1) detection with PCR and leukemia-associated immunophenotypic pattern examination with multiparameter flow cytometry (FCM). Post-HSCT, 31 patients were positive for WT1, and 8, for FCM; positivity for WT1 (18.6 vs. 6.1 %, P = 0.040) or FCM (62.5 vs. 3.6 %, P < 0.001) indicated a higher 2-year relapse rate. Twenty-one patients met our combined criteria for MRD, and the presence of MRD was associated with a higher 2-year relapse rate (27.3 vs. 4.5 %, P = 0.003). Preferentially expressed antigen of melanoma (PRAME) expression alone was not an appropriate MRD marker; however, it suggested that the MRD-positive patients may fail to respond to preemptive immunotherapy. In patients positive for both PRAME and MRD, the relapse rate was 60 % despite preemptive immunotherapy. Multivariate analysis confirmed the association between the increased relapse rate and positivity for both PRAME and MRD (hazard ratio = 42.8, P = 0.001). MRD monitoring predicted relapse in high-risk MDS post-HSCT patients, and PRAME- and MRD-positive patients did not benefit from preemptive immunotherapy.
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Acknowledgements
The authors thank Editage for their assistance in editing this manuscript. This work was supported by the Key Program of the National Natural Science Foundation of China (Grant 81230013), Project TG-2015-003 supported by the Health Science Promotion Project of Beijing, Beijing Talents fund (No. 2015000021223ZK39), and the National Natural Science Foundation of China (Grant 81400145).
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Informed consent was obtained from all patients, and the study was conducted according to the Declaration of Helsinki.
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Supplementary Table 1
Characteristics between PRAME (+) MRD (+) and PRAME (-) MRD (+) patients. (DOC 66 kb)
Supplementary Figure 1
PRAME, MRD, and preemptive immunotherapy after HSCT. DLI: donor lymphocyte infusion; IFN: interferon; IST: immunosuppressive therapy; MRD: minimal residual disease. (TIF 5380 kb)
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Mo, XD., Qin, YZ., Zhang, XH. et al. Minimal residual disease monitoring and preemptive immunotherapy in myelodysplastic syndrome after allogeneic hematopoietic stem cell transplantation. Ann Hematol 95, 1233–1240 (2016). https://doi.org/10.1007/s00277-016-2706-y
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DOI: https://doi.org/10.1007/s00277-016-2706-y