Abstract
Residual normal plasma cells (NPCs), which compete with tumor plasma cells, play an important role in multiple myeloma. However, large-scale cohort studies investigating residual NPCs, especially at the minimal residual disease (MRD) phase, are currently lacking. In this study, we conducted a comprehensive investigation into the clinical significance of residual NPCs throughout the entire disease course in 1363 myeloma patients from the NICHE cohort (NCT04645199). Our results revealed that myeloma patients with high baseline NPCs ratio (≥5%) exhibited distinct indolent features, characterized by lower tumor burden, reduced frequencies of cytopenia, immunoparesis, and high-risk cytogenetics. Importantly, high residual NPCs ratio at diagnosis or relapse was independently associated with favorable survival. High absolute percentages of NPCs at undetectable MRD were related with superior clinical benefit and immune reconstitution. At MRD-positive phases, grouping based on NPCs ratio (<50%, 50–90%, ≥90%) demonstrated better risk stratification compared to residual tumor log levels. Based on the time-dependent NPCs ratio trend, we developed a dynamic MRD model that classifies patients into three groups with diverse longitudinal trends, leading to distinct prognoses. Collectively, residual NPCs serves not only as a valuable complementary biomarker for risk stratification but also provides valuable insights on reclassifications and kinetics of MRD.
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Data availability
The data generated in this study are available upon request from the corresponding author.
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Acknowledgements
The authors thank the patients and their families, friends, and caregivers and all the study staff and health care providers on coordination; all the faculty and staff at the Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College.
Funding
This work was supported by the National Natural Science Foundation of China (82270218, 82300238, U22A20291, and 81920108006), the Chinese Academy of Medical Sciences Innovation Fund for Medical Sciences (2022-I2M-1-022, 2021-I2M-1-041, and 2021-I2M-C&T-B-079).
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WY, LS, and GA analyzed data, interpreted results, and drafted the manuscript; JL, JX, LL, JC, YL, CD, XM, TY, and SZ collected data and performed patient follow-up; RL, WS, SD, SY, YX, and GA acquired data and managed patients; XL, MH, XD, YX, and DZ suggested revisions; MH, and LQ, and GA designed the research and approved the final version.
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This study was conducted in accordance with the principles of the Declaration of Helsinki and was approved by the Blood Diseases Hospital. Written informed consent was obtained from all patients to publish this paper.
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Yan, W., Shi, L., Xu, J. et al. Clinical implications of residual normal plasma cells within bone marrow across various disease stages in multiple myeloma. Leukemia (2024). https://doi.org/10.1038/s41375-024-02366-9
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DOI: https://doi.org/10.1038/s41375-024-02366-9