Abstract
Approximately half of patients with chronic myeloid leukemia (CML) in sustained deep molecular response who discontinue tyrosine kinase inhibitors (TKIs) remain in treatment-free remission (TFR). Some of these patients have measurable residual disease (MRD) by BCR-ABL1 mRNA testing, and most have detectable BCR-ABL1 DNA by highly sensitive methods. We used fluorescence-activated cell sorting and BCR-ABL1 DNA PCR to investigate the lineage of residual CML cells in TFR. Twenty patients in TFR for >1 year provided blood for sorting into granulocytes, monocytes, B cells, T cells, and NK cells. MRD was identified predominantly in the lymphoid compartment and never in granulocytes. B cells were more often BCR-ABL1 positive than T cells (18 vs 11/20 patients) and at higher levels (median 10ā4.9 vs 10ā5.7; Pā=ā0.014). In 13 CML patients studied at diagnosis lymphocytes expressing BCR-ABL1 mRNA comprised a small proportion of total leukocytes. These data improve our understanding of TFR biology, since it is now clear that MRD in the blood of TFR patients need not imply the persistence of multipotent CML cells. Lineage-specific assessment of MRD could be explored as a means to improve the prediction of TFR.
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Acknowledgements
The authors are grateful to the patients who donated samples for this study, to the investigators and coordinators of the ALLG CML8 study, and to the staff of the South Australian Cancer Research Biobank. This study was funded by Project Grants #1138935 and #1051965 from the Australian National Health & Medical Research Council (NHMRC). SB and DLW receive fellowship support from the NHMRC (#1104425). DLW also receives fellowship support from the South Australian Cancer Council Beat Cancer Project. This study was undertaken with the financial support of Cancer Council SAās Beat Cancer Project on behalf of its donors and the State Government through the Department of Health.
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ISP designed and performed experiments, analysed the data, and prepared the paper; PD, VAS, RG, SW, and JM performed experiments and reviewed the paper; NS and DTY contributed essential clinical data and reviewed the paper; LC and ZR assisted with the collection of samples and clinical data; CHK performed the analysis of the next generation sequencing data; JB, HA, and SB contributed RQ-PCR data and reviewed the paper; ASMY and DLW supervised research, and reviewed the paper. TPH and DMR designed the study, supervised research, and reviewed the paper.
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SB declares research funding from Novartis, advisory board participation for Qiagen, Novartis, and BMS, and honoraria from Qiagen, Novartis, BMS, and Cepheid. ASMY declares research funding from Novartis, BMS, and Celgene and honoraria from Novartis and BMS. DLW declares research funding and honoraria from BMS and honoraria from Amgen. TPH declares research funding and honoraria from Novartis and BMS, and advisory board participation for Novartis, BMS, and Incyte. DMR declares research funding from Novartis and Celgene, and honoraria from Novartis and BMS. The remaining authors declare no conflict of interest.
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Pagani, I.S., Dang, P., Saunders, V.A. et al. Lineage of measurable residual disease in patients with chronic myeloid leukemia in treatment-free remission. Leukemia 34, 1052ā1061 (2020). https://doi.org/10.1038/s41375-019-0647-x
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DOI: https://doi.org/10.1038/s41375-019-0647-x
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